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Install",[604,605,606,634,650,666],"code-group",{},[607,608,614],"pre",{"className":609,"code":610,"filename":611,"language":612,"meta":613,"style":613},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add evlog express\n","pnpm","bash","",[539,615,616],{"__ignoreMap":613},[617,618,621,624,628,631],"span",{"class":619,"line":620},"line",1,[617,622,611],{"class":623},"sBMFI",[617,625,627],{"class":626},"sfazB"," add",[617,629,630],{"class":626}," evlog",[617,632,633],{"class":626}," express\n",[607,635,638],{"className":609,"code":636,"filename":637,"language":612,"meta":613,"style":613},"bun add evlog express\n","bun",[539,639,640],{"__ignoreMap":613},[617,641,642,644,646,648],{"class":619,"line":620},[617,643,637],{"class":623},[617,645,627],{"class":626},[617,647,630],{"class":626},[617,649,633],{"class":626},[607,651,654],{"className":609,"code":652,"filename":653,"language":612,"meta":613,"style":613},"yarn add evlog express\n","yarn",[539,655,656],{"__ignoreMap":613},[617,657,658,660,662,664],{"class":619,"line":620},[617,659,653],{"class":623},[617,661,627],{"class":626},[617,663,630],{"class":626},[617,665,633],{"class":626},[607,667,670],{"className":609,"code":668,"filename":669,"language":612,"meta":613,"style":613},"npm install evlog express\n","npm",[539,671,672],{"__ignoreMap":613},[617,673,674,676,679,681],{"class":619,"line":620},[617,675,669],{"class":623},[617,677,678],{"class":626}," install",[617,680,630],{"class":626},[617,682,633],{"class":626},[599,684,686],{"id":685},"_2-initialize-and-register-the-middleware","2. Initialize and register the middleware",[607,688,693],{"className":689,"code":690,"filename":691,"language":692,"meta":613,"style":613},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import express from 'express'\nimport { initLogger } from 'evlog'\nimport { evlog } from 'evlog\u002Fexpress'\n\ninitLogger({\n  env: { service: 'my-api' },\n})\n\nconst app = express()\n\napp.use(evlog())\n\napp.get('\u002Fhealth', (req, res) => {\n  req.log.set({ route: 'health' })\n  res.json({ ok: true })\n})\n\napp.listen(3000)\n","src\u002Findex.ts","typescript",[539,694,695,718,742,761,768,781,809,818,823,842,847,866,871,914,951,979,986,991],{"__ignoreMap":613},[617,696,697,701,705,708,712,715],{"class":619,"line":620},[617,698,700],{"class":699},"s7zQu","import",[617,702,704],{"class":703},"sTEyZ"," express ",[617,706,707],{"class":699},"from",[617,709,711],{"class":710},"sMK4o"," '",[617,713,714],{"class":626},"express",[617,716,717],{"class":710},"'\n",[617,719,721,723,726,729,732,735,737,740],{"class":619,"line":720},2,[617,722,700],{"class":699},[617,724,725],{"class":710}," {",[617,727,728],{"class":703}," initLogger",[617,730,731],{"class":710}," }",[617,733,734],{"class":699}," from",[617,736,711],{"class":710},[617,738,739],{"class":626},"evlog",[617,741,717],{"class":710},[617,743,745,747,749,751,753,755,757,759],{"class":619,"line":744},3,[617,746,700],{"class":699},[617,748,725],{"class":710},[617,750,630],{"class":703},[617,752,731],{"class":710},[617,754,734],{"class":699},[617,756,711],{"class":710},[617,758,541],{"class":626},[617,760,717],{"class":710},[617,762,764],{"class":619,"line":763},4,[617,765,767],{"emptyLinePlaceholder":766},true,"\n",[617,769,771,775,778],{"class":619,"line":770},5,[617,772,774],{"class":773},"s2Zo4","initLogger",[617,776,777],{"class":703},"(",[617,779,780],{"class":710},"{\n",[617,782,784,788,791,793,796,798,800,803,806],{"class":619,"line":783},6,[617,785,787],{"class":786},"swJcz","  env",[617,789,790],{"class":710},":",[617,792,725],{"class":710},[617,794,795],{"class":786}," service",[617,797,790],{"class":710},[617,799,711],{"class":710},[617,801,802],{"class":626},"my-api",[617,804,805],{"class":710},"'",[617,807,808],{"class":710}," },\n",[617,810,812,815],{"class":619,"line":811},7,[617,813,814],{"class":710},"}",[617,816,817],{"class":703},")\n",[617,819,821],{"class":619,"line":820},8,[617,822,767],{"emptyLinePlaceholder":766},[617,824,826,830,833,836,839],{"class":619,"line":825},9,[617,827,829],{"class":828},"spNyl","const",[617,831,832],{"class":703}," app ",[617,834,835],{"class":710},"=",[617,837,838],{"class":773}," express",[617,840,841],{"class":703},"()\n",[617,843,845],{"class":619,"line":844},10,[617,846,767],{"emptyLinePlaceholder":766},[617,848,850,853,856,859,861,863],{"class":619,"line":849},11,[617,851,852],{"class":703},"app",[617,854,855],{"class":710},".",[617,857,858],{"class":773},"use",[617,860,777],{"class":703},[617,862,739],{"class":773},[617,864,865],{"class":703},"())\n",[617,867,869],{"class":619,"line":868},12,[617,870,767],{"emptyLinePlaceholder":766},[617,872,874,876,878,881,883,885,888,890,893,896,900,902,905,908,911],{"class":619,"line":873},13,[617,875,852],{"class":703},[617,877,855],{"class":710},[617,879,880],{"class":773},"get",[617,882,777],{"class":703},[617,884,805],{"class":710},[617,886,887],{"class":626},"\u002Fhealth",[617,889,805],{"class":710},[617,891,892],{"class":710},",",[617,894,895],{"class":710}," (",[617,897,899],{"class":898},"sHdIc","req",[617,901,892],{"class":710},[617,903,904],{"class":898}," res",[617,906,907],{"class":710},")",[617,909,910],{"class":828}," =>",[617,912,913],{"class":710}," {\n",[617,915,917,920,922,925,927,930,932,935,938,940,942,945,947,949],{"class":619,"line":916},14,[617,918,919],{"class":703},"  req",[617,921,855],{"class":710},[617,923,924],{"class":703},"log",[617,926,855],{"class":710},[617,928,929],{"class":773},"set",[617,931,777],{"class":786},[617,933,934],{"class":710},"{",[617,936,937],{"class":786}," route",[617,939,790],{"class":710},[617,941,711],{"class":710},[617,943,944],{"class":626},"health",[617,946,805],{"class":710},[617,948,731],{"class":710},[617,950,817],{"class":786},[617,952,954,957,959,962,964,966,969,971,975,977],{"class":619,"line":953},15,[617,955,956],{"class":703},"  res",[617,958,855],{"class":710},[617,960,961],{"class":773},"json",[617,963,777],{"class":786},[617,965,934],{"class":710},[617,967,968],{"class":786}," ok",[617,970,790],{"class":710},[617,972,974],{"class":973},"sfNiH"," true",[617,976,731],{"class":710},[617,978,817],{"class":786},[617,980,982,984],{"class":619,"line":981},16,[617,983,814],{"class":710},[617,985,817],{"class":703},[617,987,989],{"class":619,"line":988},17,[617,990,767],{"emptyLinePlaceholder":766},[617,992,994,996,998,1001,1003,1007],{"class":619,"line":993},18,[617,995,852],{"class":703},[617,997,855],{"class":710},[617,999,1000],{"class":773},"listen",[617,1002,777],{"class":703},[617,1004,1006],{"class":1005},"sbssI","3000",[617,1008,817],{"class":703},[1010,1011,1013,1017,1018,1024,1025,1028,1029,1032],"callout",{"color":1012,"icon":515},"info",[1014,1015,1016],"strong",{},"Using Vite?"," The ",[584,1019,1020,1023],{"href":513},[539,1021,1022],{},"evlog\u002Fvite"," plugin"," replaces the ",[539,1026,1027],{},"initLogger()"," call with compile-time auto-initialization, strips ",[539,1030,1031],{},"log.debug()"," from production builds, and injects source locations.",[535,1034,1035,1036,1038],{},"The logger is available on ",[539,1037,545],{}," with full TypeScript support via module augmentation, so no extra type annotations are needed.",[595,1040,46],{"id":1041},"wide-events",[535,1043,1044],{},"Build up context progressively through your handler. One request = one wide event:",[607,1046,1048],{"className":689,"code":1047,"filename":691,"language":692,"meta":613,"style":613},"app.get('\u002Fusers\u002F:id', async (req, res) => {\n  const userId = req.params.id\n\n  req.log.set({ user: { id: userId } })\n\n  const user = await db.findUser(userId)\n  req.log.set({ user: { name: user.name, plan: user.plan } })\n\n  const orders = await db.findOrders(userId)\n  req.log.set({ orders: { count: orders.length, totalRevenue: sum(orders) } })\n\n  res.json({ user, orders })\n})\n",[539,1049,1050,1086,1110,1114,1150,1154,1180,1234,1238,1262,1320,1324,1346],{"__ignoreMap":613},[617,1051,1052,1054,1056,1058,1060,1062,1065,1067,1069,1072,1074,1076,1078,1080,1082,1084],{"class":619,"line":620},[617,1053,852],{"class":703},[617,1055,855],{"class":710},[617,1057,880],{"class":773},[617,1059,777],{"class":703},[617,1061,805],{"class":710},[617,1063,1064],{"class":626},"\u002Fusers\u002F:id",[617,1066,805],{"class":710},[617,1068,892],{"class":710},[617,1070,1071],{"class":828}," async",[617,1073,895],{"class":710},[617,1075,899],{"class":898},[617,1077,892],{"class":710},[617,1079,904],{"class":898},[617,1081,907],{"class":710},[617,1083,910],{"class":828},[617,1085,913],{"class":710},[617,1087,1088,1091,1094,1097,1100,1102,1105,1107],{"class":619,"line":720},[617,1089,1090],{"class":828},"  const",[617,1092,1093],{"class":703}," userId",[617,1095,1096],{"class":710}," =",[617,1098,1099],{"class":703}," req",[617,1101,855],{"class":710},[617,1103,1104],{"class":703},"params",[617,1106,855],{"class":710},[617,1108,1109],{"class":703},"id\n",[617,1111,1112],{"class":619,"line":744},[617,1113,767],{"emptyLinePlaceholder":766},[617,1115,1116,1118,1120,1122,1124,1126,1128,1130,1133,1135,1137,1140,1142,1144,1146,1148],{"class":619,"line":763},[617,1117,919],{"class":703},[617,1119,855],{"class":710},[617,1121,924],{"class":703},[617,1123,855],{"class":710},[617,1125,929],{"class":773},[617,1127,777],{"class":786},[617,1129,934],{"class":710},[617,1131,1132],{"class":786}," user",[617,1134,790],{"class":710},[617,1136,725],{"class":710},[617,1138,1139],{"class":786}," id",[617,1141,790],{"class":710},[617,1143,1093],{"class":703},[617,1145,731],{"class":710},[617,1147,731],{"class":710},[617,1149,817],{"class":786},[617,1151,1152],{"class":619,"line":770},[617,1153,767],{"emptyLinePlaceholder":766},[617,1155,1156,1158,1160,1162,1165,1168,1170,1173,1175,1178],{"class":619,"line":783},[617,1157,1090],{"class":828},[617,1159,1132],{"class":703},[617,1161,1096],{"class":710},[617,1163,1164],{"class":699}," await",[617,1166,1167],{"class":703}," db",[617,1169,855],{"class":710},[617,1171,1172],{"class":773},"findUser",[617,1174,777],{"class":786},[617,1176,1177],{"class":703},"userId",[617,1179,817],{"class":786},[617,1181,1182,1184,1186,1188,1190,1192,1194,1196,1198,1200,1202,1205,1207,1209,1211,1214,1216,1219,1221,1223,1225,1228,1230,1232],{"class":619,"line":811},[617,1183,919],{"class":703},[617,1185,855],{"class":710},[617,1187,924],{"class":703},[617,1189,855],{"class":710},[617,1191,929],{"class":773},[617,1193,777],{"class":786},[617,1195,934],{"class":710},[617,1197,1132],{"class":786},[617,1199,790],{"class":710},[617,1201,725],{"class":710},[617,1203,1204],{"class":786}," name",[617,1206,790],{"class":710},[617,1208,1132],{"class":703},[617,1210,855],{"class":710},[617,1212,1213],{"class":703},"name",[617,1215,892],{"class":710},[617,1217,1218],{"class":786}," plan",[617,1220,790],{"class":710},[617,1222,1132],{"class":703},[617,1224,855],{"class":710},[617,1226,1227],{"class":703},"plan",[617,1229,731],{"class":710},[617,1231,731],{"class":710},[617,1233,817],{"class":786},[617,1235,1236],{"class":619,"line":820},[617,1237,767],{"emptyLinePlaceholder":766},[617,1239,1240,1242,1245,1247,1249,1251,1253,1256,1258,1260],{"class":619,"line":825},[617,1241,1090],{"class":828},[617,1243,1244],{"class":703}," orders",[617,1246,1096],{"class":710},[617,1248,1164],{"class":699},[617,1250,1167],{"class":703},[617,1252,855],{"class":710},[617,1254,1255],{"class":773},"findOrders",[617,1257,777],{"class":786},[617,1259,1177],{"class":703},[617,1261,817],{"class":786},[617,1263,1264,1266,1268,1270,1272,1274,1276,1278,1280,1282,1284,1287,1289,1291,1293,1296,1298,1301,1303,1306,1308,1311,1314,1316,1318],{"class":619,"line":844},[617,1265,919],{"class":703},[617,1267,855],{"class":710},[617,1269,924],{"class":703},[617,1271,855],{"class":710},[617,1273,929],{"class":773},[617,1275,777],{"class":786},[617,1277,934],{"class":710},[617,1279,1244],{"class":786},[617,1281,790],{"class":710},[617,1283,725],{"class":710},[617,1285,1286],{"class":786}," count",[617,1288,790],{"class":710},[617,1290,1244],{"class":703},[617,1292,855],{"class":710},[617,1294,1295],{"class":703},"length",[617,1297,892],{"class":710},[617,1299,1300],{"class":786}," totalRevenue",[617,1302,790],{"class":710},[617,1304,1305],{"class":773}," sum",[617,1307,777],{"class":786},[617,1309,1310],{"class":703},"orders",[617,1312,1313],{"class":786},") ",[617,1315,814],{"class":710},[617,1317,731],{"class":710},[617,1319,817],{"class":786},[617,1321,1322],{"class":619,"line":849},[617,1323,767],{"emptyLinePlaceholder":766},[617,1325,1326,1328,1330,1332,1334,1336,1338,1340,1342,1344],{"class":619,"line":868},[617,1327,956],{"class":703},[617,1329,855],{"class":710},[617,1331,961],{"class":773},[617,1333,777],{"class":786},[617,1335,934],{"class":710},[617,1337,1132],{"class":703},[617,1339,892],{"class":710},[617,1341,1244],{"class":703},[617,1343,731],{"class":710},[617,1345,817],{"class":786},[617,1347,1348,1350],{"class":619,"line":873},[617,1349,814],{"class":710},[617,1351,817],{"class":703},[535,1353,1354],{},"All fields are merged into a single wide event emitted when the response finishes:",[607,1356,1359],{"className":609,"code":1357,"filename":1358,"language":612,"meta":613,"style":613},"14:58:15 INFO [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n  ├─ orders: count=2 totalRevenue=6298\n  ├─ user: id=usr_123 name=Alice plan=pro\n  └─ requestId: 4a8ff3a8-...\n","Terminal output",[539,1360,1361,1372,1392,1408],{"__ignoreMap":613},[617,1362,1363,1366,1369],{"class":619,"line":620},[617,1364,1365],{"class":623},"14:58:15",[617,1367,1368],{"class":626}," INFO",[617,1370,1371],{"class":703}," [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n",[617,1373,1374,1377,1380,1383,1386,1389],{"class":619,"line":720},[617,1375,1376],{"class":623},"  ├─",[617,1378,1379],{"class":626}," orders:",[617,1381,1382],{"class":626}," count=",[617,1384,1385],{"class":1005},"2",[617,1387,1388],{"class":626}," totalRevenue=",[617,1390,1391],{"class":1005},"6298\n",[617,1393,1394,1396,1399,1402,1405],{"class":619,"line":744},[617,1395,1376],{"class":623},[617,1397,1398],{"class":626}," user:",[617,1400,1401],{"class":626}," id=usr_123",[617,1403,1404],{"class":626}," name=Alice",[617,1406,1407],{"class":626}," plan=pro\n",[617,1409,1410,1413,1416],{"class":619,"line":763},[617,1411,1412],{"class":623},"  └─",[617,1414,1415],{"class":626}," requestId:",[617,1417,1418],{"class":626}," 4a8ff3a8-...\n",[595,1420,1422],{"id":1421},"uselogger","useLogger()",[535,1424,1425,1426,1428,1429,1431],{},"Use ",[539,1427,1422],{}," to access the request-scoped logger from anywhere in the call stack without passing ",[539,1430,899],{}," through your service layer:",[607,1433,1436],{"className":689,"code":1434,"filename":1435,"language":692,"meta":613,"style":613},"import { useLogger } from 'evlog\u002Fexpress'\n\nexport async function findUser(id: string) {\n  const log = useLogger()\n  log.set({ user: { id } })\n\n  const user = await db.findUser(id)\n  log.set({ user: { name: user.name, plan: user.plan } })\n\n  return user\n}\n","src\u002Fservices\u002Fuser.ts",[539,1437,1438,1457,1461,1488,1501,1528,1532,1554,1600,1604,1612],{"__ignoreMap":613},[617,1439,1440,1442,1444,1447,1449,1451,1453,1455],{"class":619,"line":620},[617,1441,700],{"class":699},[617,1443,725],{"class":710},[617,1445,1446],{"class":703}," useLogger",[617,1448,731],{"class":710},[617,1450,734],{"class":699},[617,1452,711],{"class":710},[617,1454,541],{"class":626},[617,1456,717],{"class":710},[617,1458,1459],{"class":619,"line":720},[617,1460,767],{"emptyLinePlaceholder":766},[617,1462,1463,1466,1468,1471,1474,1476,1479,1481,1484,1486],{"class":619,"line":744},[617,1464,1465],{"class":699},"export",[617,1467,1071],{"class":828},[617,1469,1470],{"class":828}," function",[617,1472,1473],{"class":773}," findUser",[617,1475,777],{"class":710},[617,1477,1478],{"class":898},"id",[617,1480,790],{"class":710},[617,1482,1483],{"class":623}," string",[617,1485,907],{"class":710},[617,1487,913],{"class":710},[617,1489,1490,1492,1495,1497,1499],{"class":619,"line":763},[617,1491,1090],{"class":828},[617,1493,1494],{"class":703}," log",[617,1496,1096],{"class":710},[617,1498,1446],{"class":773},[617,1500,841],{"class":786},[617,1502,1503,1506,1508,1510,1512,1514,1516,1518,1520,1522,1524,1526],{"class":619,"line":770},[617,1504,1505],{"class":703},"  log",[617,1507,855],{"class":710},[617,1509,929],{"class":773},[617,1511,777],{"class":786},[617,1513,934],{"class":710},[617,1515,1132],{"class":786},[617,1517,790],{"class":710},[617,1519,725],{"class":710},[617,1521,1139],{"class":703},[617,1523,731],{"class":710},[617,1525,731],{"class":710},[617,1527,817],{"class":786},[617,1529,1530],{"class":619,"line":783},[617,1531,767],{"emptyLinePlaceholder":766},[617,1533,1534,1536,1538,1540,1542,1544,1546,1548,1550,1552],{"class":619,"line":811},[617,1535,1090],{"class":828},[617,1537,1132],{"class":703},[617,1539,1096],{"class":710},[617,1541,1164],{"class":699},[617,1543,1167],{"class":703},[617,1545,855],{"class":710},[617,1547,1172],{"class":773},[617,1549,777],{"class":786},[617,1551,1478],{"class":703},[617,1553,817],{"class":786},[617,1555,1556,1558,1560,1562,1564,1566,1568,1570,1572,1574,1576,1578,1580,1582,1584,1586,1588,1590,1592,1594,1596,1598],{"class":619,"line":820},[617,1557,1505],{"class":703},[617,1559,855],{"class":710},[617,1561,929],{"class":773},[617,1563,777],{"class":786},[617,1565,934],{"class":710},[617,1567,1132],{"class":786},[617,1569,790],{"class":710},[617,1571,725],{"class":710},[617,1573,1204],{"class":786},[617,1575,790],{"class":710},[617,1577,1132],{"class":703},[617,1579,855],{"class":710},[617,1581,1213],{"class":703},[617,1583,892],{"class":710},[617,1585,1218],{"class":786},[617,1587,790],{"class":710},[617,1589,1132],{"class":703},[617,1591,855],{"class":710},[617,1593,1227],{"class":703},[617,1595,731],{"class":710},[617,1597,731],{"class":710},[617,1599,817],{"class":786},[617,1601,1602],{"class":619,"line":825},[617,1603,767],{"emptyLinePlaceholder":766},[617,1605,1606,1609],{"class":619,"line":844},[617,1607,1608],{"class":699},"  return",[617,1610,1611],{"class":703}," user\n",[617,1613,1614],{"class":619,"line":849},[617,1615,1616],{"class":710},"}\n",[607,1618,1620],{"className":689,"code":1619,"filename":691,"language":692,"meta":613,"style":613},"import { findUser } from '.\u002Fservices\u002Fuser'\n\napp.get('\u002Fusers\u002F:id', async (req, res) => {\n  const user = await findUser(req.params.id)\n  res.json(user)\n})\n",[539,1621,1622,1641,1645,1679,1705,1720],{"__ignoreMap":613},[617,1623,1624,1626,1628,1630,1632,1634,1636,1639],{"class":619,"line":620},[617,1625,700],{"class":699},[617,1627,725],{"class":710},[617,1629,1473],{"class":703},[617,1631,731],{"class":710},[617,1633,734],{"class":699},[617,1635,711],{"class":710},[617,1637,1638],{"class":626},".\u002Fservices\u002Fuser",[617,1640,717],{"class":710},[617,1642,1643],{"class":619,"line":720},[617,1644,767],{"emptyLinePlaceholder":766},[617,1646,1647,1649,1651,1653,1655,1657,1659,1661,1663,1665,1667,1669,1671,1673,1675,1677],{"class":619,"line":744},[617,1648,852],{"class":703},[617,1650,855],{"class":710},[617,1652,880],{"class":773},[617,1654,777],{"class":703},[617,1656,805],{"class":710},[617,1658,1064],{"class":626},[617,1660,805],{"class":710},[617,1662,892],{"class":710},[617,1664,1071],{"class":828},[617,1666,895],{"class":710},[617,1668,899],{"class":898},[617,1670,892],{"class":710},[617,1672,904],{"class":898},[617,1674,907],{"class":710},[617,1676,910],{"class":828},[617,1678,913],{"class":710},[617,1680,1681,1683,1685,1687,1689,1691,1693,1695,1697,1699,1701,1703],{"class":619,"line":763},[617,1682,1090],{"class":828},[617,1684,1132],{"class":703},[617,1686,1096],{"class":710},[617,1688,1164],{"class":699},[617,1690,1473],{"class":773},[617,1692,777],{"class":786},[617,1694,899],{"class":703},[617,1696,855],{"class":710},[617,1698,1104],{"class":703},[617,1700,855],{"class":710},[617,1702,1478],{"class":703},[617,1704,817],{"class":786},[617,1706,1707,1709,1711,1713,1715,1718],{"class":619,"line":770},[617,1708,956],{"class":703},[617,1710,855],{"class":710},[617,1712,961],{"class":773},[617,1714,777],{"class":786},[617,1716,1717],{"class":703},"user",[617,1719,817],{"class":786},[617,1721,1722,1724],{"class":619,"line":783},[617,1723,814],{"class":710},[617,1725,817],{"class":703},[535,1727,1728,1729,1731,1732,1734,1735,1737,1738,1741],{},"Both ",[539,1730,545],{}," and ",[539,1733,1422],{}," return the same logger instance. ",[539,1736,1422],{}," uses ",[539,1739,1740],{},"AsyncLocalStorage"," to propagate the logger across async boundaries.",[595,1743,1745,1746,907],{"id":1744},"background-work-logfork","Background work (",[539,1747,1748],{},"log.fork",[535,1750,1751,1752,1755,1756,1761,1762,1764,1765,1768,1769,1772,1773,1731,1776,1779,1780,855],{},"Fire-and-forget async work that finishes ",[1014,1753,1754],{},"after"," the response can no longer update the request wide event (the logger is sealed after emit). Use ",[1014,1757,1758],{},[539,1759,1760],{},"req.log.fork(label, fn)"," so ",[539,1763,1422],{}," inside ",[539,1766,1767],{},"fn"," targets a ",[1014,1770,1771],{},"child"," logger that emits its own event with ",[539,1774,1775],{},"operation",[539,1777,1778],{},"_parentRequestId",". See ",[584,1781,1783],{"href":1782},"\u002Flearn\u002Fwide-events#after-emit-sealing-and-background-work","Wide events — After emit",[607,1785,1787],{"className":689,"code":1786,"filename":691,"language":692,"meta":613,"style":613},"import { evlog, useLogger } from 'evlog\u002Fexpress'\n\napp.use(evlog())\n\napp.post('\u002Forders', (req, res) => {\n  req.log.set({ orderId: 'ord_1' })\n  req.log.fork!('fulfill_order', async () => {\n    const log = useLogger()\n    log.set({ step: 'inventory_ok' })\n  })\n  res.json({ ok: true })\n})\n",[539,1788,1789,1811,1815,1829,1833,1867,1899,1935,1948,1977,1984,2006],{"__ignoreMap":613},[617,1790,1791,1793,1795,1797,1799,1801,1803,1805,1807,1809],{"class":619,"line":620},[617,1792,700],{"class":699},[617,1794,725],{"class":710},[617,1796,630],{"class":703},[617,1798,892],{"class":710},[617,1800,1446],{"class":703},[617,1802,731],{"class":710},[617,1804,734],{"class":699},[617,1806,711],{"class":710},[617,1808,541],{"class":626},[617,1810,717],{"class":710},[617,1812,1813],{"class":619,"line":720},[617,1814,767],{"emptyLinePlaceholder":766},[617,1816,1817,1819,1821,1823,1825,1827],{"class":619,"line":744},[617,1818,852],{"class":703},[617,1820,855],{"class":710},[617,1822,858],{"class":773},[617,1824,777],{"class":703},[617,1826,739],{"class":773},[617,1828,865],{"class":703},[617,1830,1831],{"class":619,"line":763},[617,1832,767],{"emptyLinePlaceholder":766},[617,1834,1835,1837,1839,1842,1844,1846,1849,1851,1853,1855,1857,1859,1861,1863,1865],{"class":619,"line":770},[617,1836,852],{"class":703},[617,1838,855],{"class":710},[617,1840,1841],{"class":773},"post",[617,1843,777],{"class":703},[617,1845,805],{"class":710},[617,1847,1848],{"class":626},"\u002Forders",[617,1850,805],{"class":710},[617,1852,892],{"class":710},[617,1854,895],{"class":710},[617,1856,899],{"class":898},[617,1858,892],{"class":710},[617,1860,904],{"class":898},[617,1862,907],{"class":710},[617,1864,910],{"class":828},[617,1866,913],{"class":710},[617,1868,1869,1871,1873,1875,1877,1879,1881,1883,1886,1888,1890,1893,1895,1897],{"class":619,"line":783},[617,1870,919],{"class":703},[617,1872,855],{"class":710},[617,1874,924],{"class":703},[617,1876,855],{"class":710},[617,1878,929],{"class":773},[617,1880,777],{"class":786},[617,1882,934],{"class":710},[617,1884,1885],{"class":786}," orderId",[617,1887,790],{"class":710},[617,1889,711],{"class":710},[617,1891,1892],{"class":626},"ord_1",[617,1894,805],{"class":710},[617,1896,731],{"class":710},[617,1898,817],{"class":786},[617,1900,1901,1903,1905,1907,1909,1912,1915,1917,1919,1922,1924,1926,1928,1931,1933],{"class":619,"line":811},[617,1902,919],{"class":703},[617,1904,855],{"class":710},[617,1906,924],{"class":703},[617,1908,855],{"class":710},[617,1910,1911],{"class":773},"fork",[617,1913,1914],{"class":710},"!",[617,1916,777],{"class":786},[617,1918,805],{"class":710},[617,1920,1921],{"class":626},"fulfill_order",[617,1923,805],{"class":710},[617,1925,892],{"class":710},[617,1927,1071],{"class":828},[617,1929,1930],{"class":710}," ()",[617,1932,910],{"class":828},[617,1934,913],{"class":710},[617,1936,1937,1940,1942,1944,1946],{"class":619,"line":820},[617,1938,1939],{"class":828},"    const",[617,1941,1494],{"class":703},[617,1943,1096],{"class":710},[617,1945,1446],{"class":773},[617,1947,841],{"class":786},[617,1949,1950,1953,1955,1957,1959,1961,1964,1966,1968,1971,1973,1975],{"class":619,"line":825},[617,1951,1952],{"class":703},"    log",[617,1954,855],{"class":710},[617,1956,929],{"class":773},[617,1958,777],{"class":786},[617,1960,934],{"class":710},[617,1962,1963],{"class":786}," step",[617,1965,790],{"class":710},[617,1967,711],{"class":710},[617,1969,1970],{"class":626},"inventory_ok",[617,1972,805],{"class":710},[617,1974,731],{"class":710},[617,1976,817],{"class":786},[617,1978,1979,1982],{"class":619,"line":844},[617,1980,1981],{"class":710},"  }",[617,1983,817],{"class":786},[617,1985,1986,1988,1990,1992,1994,1996,1998,2000,2002,2004],{"class":619,"line":849},[617,1987,956],{"class":703},[617,1989,855],{"class":710},[617,1991,961],{"class":773},[617,1993,777],{"class":786},[617,1995,934],{"class":710},[617,1997,968],{"class":786},[617,1999,790],{"class":710},[617,2001,974],{"class":973},[617,2003,731],{"class":710},[617,2005,817],{"class":786},[617,2007,2008,2010],{"class":619,"line":868},[617,2009,814],{"class":710},[617,2011,817],{"class":703},[595,2013,2015],{"id":2014},"error-handling","Error Handling",[535,2017,1425,2018,2021,2022,2025,2026,2029,2030,2033],{},[539,2019,2020],{},"createError"," for structured errors with ",[539,2023,2024],{},"why",", ",[539,2027,2028],{},"fix",", and ",[539,2031,2032],{},"link"," fields. Express uses a 4-argument error handler middleware:",[607,2035,2037],{"className":689,"code":2036,"filename":691,"language":692,"meta":613,"style":613},"import { createError, parseError } from 'evlog'\n\napp.get('\u002Fcheckout', () => {\n  throw createError({\n    message: 'Payment failed',\n    status: 402,\n    why: 'Card declined by issuer',\n    fix: 'Try a different payment method',\n    link: 'https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined',\n  })\n})\n\napp.use((err, req, res, next) => {\n  req.log.error(err)\n  const parsed = parseError(err)\n\n  res.status(parsed.status).json({\n    message: parsed.message,\n    why: parsed.why,\n    fix: parsed.fix,\n    link: parsed.link,\n  })\n})\n",[539,2038,2039,2063,2067,2092,2103,2120,2132,2148,2164,2180,2186,2192,2196,2230,2249,2266,2270,2298,2313,2328,2343,2358,2365],{"__ignoreMap":613},[617,2040,2041,2043,2045,2048,2050,2053,2055,2057,2059,2061],{"class":619,"line":620},[617,2042,700],{"class":699},[617,2044,725],{"class":710},[617,2046,2047],{"class":703}," createError",[617,2049,892],{"class":710},[617,2051,2052],{"class":703}," parseError",[617,2054,731],{"class":710},[617,2056,734],{"class":699},[617,2058,711],{"class":710},[617,2060,739],{"class":626},[617,2062,717],{"class":710},[617,2064,2065],{"class":619,"line":720},[617,2066,767],{"emptyLinePlaceholder":766},[617,2068,2069,2071,2073,2075,2077,2079,2082,2084,2086,2088,2090],{"class":619,"line":744},[617,2070,852],{"class":703},[617,2072,855],{"class":710},[617,2074,880],{"class":773},[617,2076,777],{"class":703},[617,2078,805],{"class":710},[617,2080,2081],{"class":626},"\u002Fcheckout",[617,2083,805],{"class":710},[617,2085,892],{"class":710},[617,2087,1930],{"class":710},[617,2089,910],{"class":828},[617,2091,913],{"class":710},[617,2093,2094,2097,2099,2101],{"class":619,"line":763},[617,2095,2096],{"class":699},"  throw",[617,2098,2047],{"class":773},[617,2100,777],{"class":786},[617,2102,780],{"class":710},[617,2104,2105,2108,2110,2112,2115,2117],{"class":619,"line":770},[617,2106,2107],{"class":786},"    message",[617,2109,790],{"class":710},[617,2111,711],{"class":710},[617,2113,2114],{"class":626},"Payment failed",[617,2116,805],{"class":710},[617,2118,2119],{"class":710},",\n",[617,2121,2122,2125,2127,2130],{"class":619,"line":783},[617,2123,2124],{"class":786},"    status",[617,2126,790],{"class":710},[617,2128,2129],{"class":1005}," 402",[617,2131,2119],{"class":710},[617,2133,2134,2137,2139,2141,2144,2146],{"class":619,"line":811},[617,2135,2136],{"class":786},"    why",[617,2138,790],{"class":710},[617,2140,711],{"class":710},[617,2142,2143],{"class":626},"Card declined by issuer",[617,2145,805],{"class":710},[617,2147,2119],{"class":710},[617,2149,2150,2153,2155,2157,2160,2162],{"class":619,"line":820},[617,2151,2152],{"class":786},"    fix",[617,2154,790],{"class":710},[617,2156,711],{"class":710},[617,2158,2159],{"class":626},"Try a different payment method",[617,2161,805],{"class":710},[617,2163,2119],{"class":710},[617,2165,2166,2169,2171,2173,2176,2178],{"class":619,"line":825},[617,2167,2168],{"class":786},"    link",[617,2170,790],{"class":710},[617,2172,711],{"class":710},[617,2174,2175],{"class":626},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[617,2177,805],{"class":710},[617,2179,2119],{"class":710},[617,2181,2182,2184],{"class":619,"line":844},[617,2183,1981],{"class":710},[617,2185,817],{"class":786},[617,2187,2188,2190],{"class":619,"line":849},[617,2189,814],{"class":710},[617,2191,817],{"class":703},[617,2193,2194],{"class":619,"line":868},[617,2195,767],{"emptyLinePlaceholder":766},[617,2197,2198,2200,2202,2204,2206,2208,2211,2213,2215,2217,2219,2221,2224,2226,2228],{"class":619,"line":873},[617,2199,852],{"class":703},[617,2201,855],{"class":710},[617,2203,858],{"class":773},[617,2205,777],{"class":703},[617,2207,777],{"class":710},[617,2209,2210],{"class":898},"err",[617,2212,892],{"class":710},[617,2214,1099],{"class":898},[617,2216,892],{"class":710},[617,2218,904],{"class":898},[617,2220,892],{"class":710},[617,2222,2223],{"class":898}," next",[617,2225,907],{"class":710},[617,2227,910],{"class":828},[617,2229,913],{"class":710},[617,2231,2232,2234,2236,2238,2240,2243,2245,2247],{"class":619,"line":916},[617,2233,919],{"class":703},[617,2235,855],{"class":710},[617,2237,924],{"class":703},[617,2239,855],{"class":710},[617,2241,2242],{"class":773},"error",[617,2244,777],{"class":786},[617,2246,2210],{"class":703},[617,2248,817],{"class":786},[617,2250,2251,2253,2256,2258,2260,2262,2264],{"class":619,"line":953},[617,2252,1090],{"class":828},[617,2254,2255],{"class":703}," parsed",[617,2257,1096],{"class":710},[617,2259,2052],{"class":773},[617,2261,777],{"class":786},[617,2263,2210],{"class":703},[617,2265,817],{"class":786},[617,2267,2268],{"class":619,"line":981},[617,2269,767],{"emptyLinePlaceholder":766},[617,2271,2272,2274,2276,2279,2281,2284,2286,2288,2290,2292,2294,2296],{"class":619,"line":988},[617,2273,956],{"class":703},[617,2275,855],{"class":710},[617,2277,2278],{"class":773},"status",[617,2280,777],{"class":786},[617,2282,2283],{"class":703},"parsed",[617,2285,855],{"class":710},[617,2287,2278],{"class":703},[617,2289,907],{"class":786},[617,2291,855],{"class":710},[617,2293,961],{"class":773},[617,2295,777],{"class":786},[617,2297,780],{"class":710},[617,2299,2300,2302,2304,2306,2308,2311],{"class":619,"line":993},[617,2301,2107],{"class":786},[617,2303,790],{"class":710},[617,2305,2255],{"class":703},[617,2307,855],{"class":710},[617,2309,2310],{"class":703},"message",[617,2312,2119],{"class":710},[617,2314,2316,2318,2320,2322,2324,2326],{"class":619,"line":2315},19,[617,2317,2136],{"class":786},[617,2319,790],{"class":710},[617,2321,2255],{"class":703},[617,2323,855],{"class":710},[617,2325,2024],{"class":703},[617,2327,2119],{"class":710},[617,2329,2331,2333,2335,2337,2339,2341],{"class":619,"line":2330},20,[617,2332,2152],{"class":786},[617,2334,790],{"class":710},[617,2336,2255],{"class":703},[617,2338,855],{"class":710},[617,2340,2028],{"class":703},[617,2342,2119],{"class":710},[617,2344,2346,2348,2350,2352,2354,2356],{"class":619,"line":2345},21,[617,2347,2168],{"class":786},[617,2349,790],{"class":710},[617,2351,2255],{"class":703},[617,2353,855],{"class":710},[617,2355,2032],{"class":703},[617,2357,2119],{"class":710},[617,2359,2361,2363],{"class":619,"line":2360},22,[617,2362,1981],{"class":710},[617,2364,817],{"class":786},[617,2366,2368,2370],{"class":619,"line":2367},23,[617,2369,814],{"class":710},[617,2371,817],{"class":703},[535,2373,2374],{},"The error is captured and logged with both the custom context and structured error fields:",[607,2376,2378],{"className":609,"code":2377,"filename":1358,"language":612,"meta":613,"style":613},"14:58:20 ERROR [my-api] GET \u002Fcheckout 402 in 3ms\n  ├─ error: name=EvlogError message=Payment failed status=402\n  └─ requestId: 880a50ac-...\n",[539,2379,2380,2391,2413],{"__ignoreMap":613},[617,2381,2382,2385,2388],{"class":619,"line":620},[617,2383,2384],{"class":623},"14:58:20",[617,2386,2387],{"class":626}," ERROR",[617,2389,2390],{"class":703}," [my-api] GET \u002Fcheckout 402 in 3ms\n",[617,2392,2393,2395,2398,2401,2404,2407,2410],{"class":619,"line":720},[617,2394,1376],{"class":623},[617,2396,2397],{"class":626}," error:",[617,2399,2400],{"class":626}," name=EvlogError",[617,2402,2403],{"class":626}," message=Payment",[617,2405,2406],{"class":626}," failed",[617,2408,2409],{"class":626}," status=",[617,2411,2412],{"class":1005},"402\n",[617,2414,2415,2417,2419],{"class":619,"line":744},[617,2416,1412],{"class":623},[617,2418,1415],{"class":626},[617,2420,2421],{"class":626}," 880a50ac-...\n",[595,2423,504],{"id":2424},"configuration",[535,2426,2427,2428,2431,2432,2434],{},"See the ",[584,2429,2430],{"href":505},"Configuration reference"," for all available options (",[539,2433,774],{},", middleware options, sampling, silent mode, etc.).",[595,2436,2438],{"id":2437},"drain-enrichers","Drain & Enrichers",[535,2440,2441],{},"Configure drain adapters and enrichers directly in the middleware options:",[607,2443,2445],{"className":689,"code":2444,"filename":691,"language":692,"meta":613,"style":613},"import { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createUserAgentEnricher } from 'evlog\u002Fenrichers'\n\nconst userAgent = createUserAgentEnricher()\n\napp.use(evlog({\n  drain: createAxiomDrain(),\n  enrich: (ctx) => {\n    userAgent(ctx)\n    ctx.event.region = process.env.FLY_REGION\n  },\n}))\n",[539,2446,2447,2467,2487,2491,2504,2508,2524,2538,2556,2567,2597,2602],{"__ignoreMap":613},[617,2448,2449,2451,2453,2456,2458,2460,2462,2465],{"class":619,"line":620},[617,2450,700],{"class":699},[617,2452,725],{"class":710},[617,2454,2455],{"class":703}," createAxiomDrain",[617,2457,731],{"class":710},[617,2459,734],{"class":699},[617,2461,711],{"class":710},[617,2463,2464],{"class":626},"evlog\u002Faxiom",[617,2466,717],{"class":710},[617,2468,2469,2471,2473,2476,2478,2480,2482,2485],{"class":619,"line":720},[617,2470,700],{"class":699},[617,2472,725],{"class":710},[617,2474,2475],{"class":703}," createUserAgentEnricher",[617,2477,731],{"class":710},[617,2479,734],{"class":699},[617,2481,711],{"class":710},[617,2483,2484],{"class":626},"evlog\u002Fenrichers",[617,2486,717],{"class":710},[617,2488,2489],{"class":619,"line":744},[617,2490,767],{"emptyLinePlaceholder":766},[617,2492,2493,2495,2498,2500,2502],{"class":619,"line":763},[617,2494,829],{"class":828},[617,2496,2497],{"class":703}," userAgent ",[617,2499,835],{"class":710},[617,2501,2475],{"class":773},[617,2503,841],{"class":703},[617,2505,2506],{"class":619,"line":770},[617,2507,767],{"emptyLinePlaceholder":766},[617,2509,2510,2512,2514,2516,2518,2520,2522],{"class":619,"line":783},[617,2511,852],{"class":703},[617,2513,855],{"class":710},[617,2515,858],{"class":773},[617,2517,777],{"class":703},[617,2519,739],{"class":773},[617,2521,777],{"class":703},[617,2523,780],{"class":710},[617,2525,2526,2529,2531,2533,2536],{"class":619,"line":811},[617,2527,2528],{"class":786},"  drain",[617,2530,790],{"class":710},[617,2532,2455],{"class":773},[617,2534,2535],{"class":703},"()",[617,2537,2119],{"class":710},[617,2539,2540,2543,2545,2547,2550,2552,2554],{"class":619,"line":820},[617,2541,2542],{"class":773},"  enrich",[617,2544,790],{"class":710},[617,2546,895],{"class":710},[617,2548,2549],{"class":898},"ctx",[617,2551,907],{"class":710},[617,2553,910],{"class":828},[617,2555,913],{"class":710},[617,2557,2558,2561,2563,2565],{"class":619,"line":825},[617,2559,2560],{"class":773},"    userAgent",[617,2562,777],{"class":786},[617,2564,2549],{"class":703},[617,2566,817],{"class":786},[617,2568,2569,2572,2574,2577,2579,2582,2584,2587,2589,2592,2594],{"class":619,"line":844},[617,2570,2571],{"class":703},"    ctx",[617,2573,855],{"class":710},[617,2575,2576],{"class":703},"event",[617,2578,855],{"class":710},[617,2580,2581],{"class":703},"region",[617,2583,1096],{"class":710},[617,2585,2586],{"class":703}," process",[617,2588,855],{"class":710},[617,2590,2591],{"class":703},"env",[617,2593,855],{"class":710},[617,2595,2596],{"class":703},"FLY_REGION\n",[617,2598,2599],{"class":619,"line":849},[617,2600,2601],{"class":710},"  },\n",[617,2603,2604,2606],{"class":619,"line":868},[617,2605,814],{"class":710},[617,2607,2608],{"class":703},"))\n",[599,2610,2612],{"id":2611},"pipeline-batching-retry","Pipeline (Batching & Retry)",[535,2614,2615,2616,2619],{},"For production, wrap your adapter with ",[539,2617,2618],{},"createDrainPipeline"," to batch events and retry on failure:",[607,2621,2623],{"className":689,"code":2622,"filename":691,"language":692,"meta":613,"style":613},"import type { DrainContext } from 'evlog'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\nimport { createDrainPipeline } from 'evlog\u002Fpipeline'\n\nconst pipeline = createDrainPipeline\u003CDrainContext>({\n  batch: { size: 50, intervalMs: 5000 },\n  retry: { maxAttempts: 3 },\n})\nconst drain = pipeline(createAxiomDrain())\n\napp.use(evlog({ drain }))\n",[539,2624,2625,2647,2665,2685,2689,2713,2742,2761,2767,2786,2790],{"__ignoreMap":613},[617,2626,2627,2629,2632,2634,2637,2639,2641,2643,2645],{"class":619,"line":620},[617,2628,700],{"class":699},[617,2630,2631],{"class":699}," type",[617,2633,725],{"class":710},[617,2635,2636],{"class":703}," DrainContext",[617,2638,731],{"class":710},[617,2640,734],{"class":699},[617,2642,711],{"class":710},[617,2644,739],{"class":626},[617,2646,717],{"class":710},[617,2648,2649,2651,2653,2655,2657,2659,2661,2663],{"class":619,"line":720},[617,2650,700],{"class":699},[617,2652,725],{"class":710},[617,2654,2455],{"class":703},[617,2656,731],{"class":710},[617,2658,734],{"class":699},[617,2660,711],{"class":710},[617,2662,2464],{"class":626},[617,2664,717],{"class":710},[617,2666,2667,2669,2671,2674,2676,2678,2680,2683],{"class":619,"line":744},[617,2668,700],{"class":699},[617,2670,725],{"class":710},[617,2672,2673],{"class":703}," createDrainPipeline",[617,2675,731],{"class":710},[617,2677,734],{"class":699},[617,2679,711],{"class":710},[617,2681,2682],{"class":626},"evlog\u002Fpipeline",[617,2684,717],{"class":710},[617,2686,2687],{"class":619,"line":763},[617,2688,767],{"emptyLinePlaceholder":766},[617,2690,2691,2693,2696,2698,2700,2703,2706,2709,2711],{"class":619,"line":770},[617,2692,829],{"class":828},[617,2694,2695],{"class":703}," pipeline ",[617,2697,835],{"class":710},[617,2699,2673],{"class":773},[617,2701,2702],{"class":710},"\u003C",[617,2704,2705],{"class":623},"DrainContext",[617,2707,2708],{"class":710},">",[617,2710,777],{"class":703},[617,2712,780],{"class":710},[617,2714,2715,2718,2720,2722,2725,2727,2730,2732,2735,2737,2740],{"class":619,"line":783},[617,2716,2717],{"class":786},"  batch",[617,2719,790],{"class":710},[617,2721,725],{"class":710},[617,2723,2724],{"class":786}," size",[617,2726,790],{"class":710},[617,2728,2729],{"class":1005}," 50",[617,2731,892],{"class":710},[617,2733,2734],{"class":786}," intervalMs",[617,2736,790],{"class":710},[617,2738,2739],{"class":1005}," 5000",[617,2741,808],{"class":710},[617,2743,2744,2747,2749,2751,2754,2756,2759],{"class":619,"line":811},[617,2745,2746],{"class":786},"  retry",[617,2748,790],{"class":710},[617,2750,725],{"class":710},[617,2752,2753],{"class":786}," maxAttempts",[617,2755,790],{"class":710},[617,2757,2758],{"class":1005}," 3",[617,2760,808],{"class":710},[617,2762,2763,2765],{"class":619,"line":820},[617,2764,814],{"class":710},[617,2766,817],{"class":703},[617,2768,2769,2771,2774,2776,2779,2781,2784],{"class":619,"line":825},[617,2770,829],{"class":828},[617,2772,2773],{"class":703}," drain ",[617,2775,835],{"class":710},[617,2777,2778],{"class":773}," pipeline",[617,2780,777],{"class":703},[617,2782,2783],{"class":773},"createAxiomDrain",[617,2785,865],{"class":703},[617,2787,2788],{"class":619,"line":844},[617,2789,767],{"emptyLinePlaceholder":766},[617,2791,2792,2794,2796,2798,2800,2802,2804,2806,2808,2810],{"class":619,"line":849},[617,2793,852],{"class":703},[617,2795,855],{"class":710},[617,2797,858],{"class":773},[617,2799,777],{"class":703},[617,2801,739],{"class":773},[617,2803,777],{"class":703},[617,2805,934],{"class":710},[617,2807,2773],{"class":703},[617,2809,814],{"class":710},[617,2811,2608],{"class":703},[1010,2813,2814,2815,2818,2819,2822],{"color":1012,"icon":13},"Call ",[539,2816,2817],{},"drain.flush()"," on server shutdown to ensure all buffered events are sent. See the ",[584,2820,2821],{"href":496},"Pipeline docs"," for all options.",[595,2824,2826],{"id":2825},"tail-sampling","Tail Sampling",[535,2828,1425,2829,2832],{},[539,2830,2831],{},"keep"," to force-retain specific events regardless of head sampling:",[607,2834,2836],{"className":689,"code":2835,"filename":691,"language":692,"meta":613,"style":613},"app.use(evlog({\n  drain: createAxiomDrain(),\n  keep: (ctx) => {\n    if (ctx.duration && ctx.duration > 2000) ctx.shouldKeep = true\n  },\n}))\n",[539,2837,2838,2854,2866,2883,2927,2931],{"__ignoreMap":613},[617,2839,2840,2842,2844,2846,2848,2850,2852],{"class":619,"line":620},[617,2841,852],{"class":703},[617,2843,855],{"class":710},[617,2845,858],{"class":773},[617,2847,777],{"class":703},[617,2849,739],{"class":773},[617,2851,777],{"class":703},[617,2853,780],{"class":710},[617,2855,2856,2858,2860,2862,2864],{"class":619,"line":720},[617,2857,2528],{"class":786},[617,2859,790],{"class":710},[617,2861,2455],{"class":773},[617,2863,2535],{"class":703},[617,2865,2119],{"class":710},[617,2867,2868,2871,2873,2875,2877,2879,2881],{"class":619,"line":744},[617,2869,2870],{"class":773},"  keep",[617,2872,790],{"class":710},[617,2874,895],{"class":710},[617,2876,2549],{"class":898},[617,2878,907],{"class":710},[617,2880,910],{"class":828},[617,2882,913],{"class":710},[617,2884,2885,2888,2890,2892,2894,2897,2900,2903,2905,2907,2910,2913,2915,2917,2919,2922,2924],{"class":619,"line":763},[617,2886,2887],{"class":699},"    if",[617,2889,895],{"class":786},[617,2891,2549],{"class":703},[617,2893,855],{"class":710},[617,2895,2896],{"class":703},"duration",[617,2898,2899],{"class":710}," &&",[617,2901,2902],{"class":703}," ctx",[617,2904,855],{"class":710},[617,2906,2896],{"class":703},[617,2908,2909],{"class":710}," >",[617,2911,2912],{"class":1005}," 2000",[617,2914,1313],{"class":786},[617,2916,2549],{"class":703},[617,2918,855],{"class":710},[617,2920,2921],{"class":703},"shouldKeep",[617,2923,1096],{"class":710},[617,2925,2926],{"class":973}," true\n",[617,2928,2929],{"class":619,"line":770},[617,2930,2601],{"class":710},[617,2932,2933,2935],{"class":619,"line":783},[617,2934,814],{"class":710},[617,2936,2608],{"class":703},[595,2938,2940],{"id":2939},"route-filtering","Route Filtering",[535,2942,2943,2944,1731,2947,2950],{},"Control which routes are logged with ",[539,2945,2946],{},"include",[539,2948,2949],{},"exclude"," patterns:",[607,2952,2954],{"className":689,"code":2953,"filename":691,"language":692,"meta":613,"style":613},"app.use(evlog({\n  include: ['\u002Fapi\u002F**'],\n  exclude: ['\u002F_internal\u002F**', '\u002Fhealth'],\n  routes: {\n    '\u002Fapi\u002Fauth\u002F**': { service: 'auth-service' },\n    '\u002Fapi\u002Fpayment\u002F**': { service: 'payment-service' },\n  },\n}))\n",[539,2955,2956,2972,2994,3022,3031,3058,3084,3088],{"__ignoreMap":613},[617,2957,2958,2960,2962,2964,2966,2968,2970],{"class":619,"line":620},[617,2959,852],{"class":703},[617,2961,855],{"class":710},[617,2963,858],{"class":773},[617,2965,777],{"class":703},[617,2967,739],{"class":773},[617,2969,777],{"class":703},[617,2971,780],{"class":710},[617,2973,2974,2977,2979,2982,2984,2987,2989,2992],{"class":619,"line":720},[617,2975,2976],{"class":786},"  include",[617,2978,790],{"class":710},[617,2980,2981],{"class":703}," [",[617,2983,805],{"class":710},[617,2985,2986],{"class":626},"\u002Fapi\u002F**",[617,2988,805],{"class":710},[617,2990,2991],{"class":703},"]",[617,2993,2119],{"class":710},[617,2995,2996,2999,3001,3003,3005,3008,3010,3012,3014,3016,3018,3020],{"class":619,"line":744},[617,2997,2998],{"class":786},"  exclude",[617,3000,790],{"class":710},[617,3002,2981],{"class":703},[617,3004,805],{"class":710},[617,3006,3007],{"class":626},"\u002F_internal\u002F**",[617,3009,805],{"class":710},[617,3011,892],{"class":710},[617,3013,711],{"class":710},[617,3015,887],{"class":626},[617,3017,805],{"class":710},[617,3019,2991],{"class":703},[617,3021,2119],{"class":710},[617,3023,3024,3027,3029],{"class":619,"line":763},[617,3025,3026],{"class":786},"  routes",[617,3028,790],{"class":710},[617,3030,913],{"class":710},[617,3032,3033,3036,3039,3041,3043,3045,3047,3049,3051,3054,3056],{"class":619,"line":770},[617,3034,3035],{"class":710},"    '",[617,3037,3038],{"class":786},"\u002Fapi\u002Fauth\u002F**",[617,3040,805],{"class":710},[617,3042,790],{"class":710},[617,3044,725],{"class":710},[617,3046,795],{"class":786},[617,3048,790],{"class":710},[617,3050,711],{"class":710},[617,3052,3053],{"class":626},"auth-service",[617,3055,805],{"class":710},[617,3057,808],{"class":710},[617,3059,3060,3062,3065,3067,3069,3071,3073,3075,3077,3080,3082],{"class":619,"line":783},[617,3061,3035],{"class":710},[617,3063,3064],{"class":786},"\u002Fapi\u002Fpayment\u002F**",[617,3066,805],{"class":710},[617,3068,790],{"class":710},[617,3070,725],{"class":710},[617,3072,795],{"class":786},[617,3074,790],{"class":710},[617,3076,711],{"class":710},[617,3078,3079],{"class":626},"payment-service",[617,3081,805],{"class":710},[617,3083,808],{"class":710},[617,3085,3086],{"class":619,"line":811},[617,3087,2601],{"class":710},[617,3089,3090,3092],{"class":619,"line":820},[617,3091,814],{"class":710},[617,3093,2608],{"class":703},[595,3095,3097],{"id":3096},"client-side-logging","Client-Side Logging",[535,3099,1425,3100,3103],{},[539,3101,3102],{},"evlog\u002Fhttp"," to send structured logs from any frontend to your Express server. This works with any client framework (React, Vue, Svelte, vanilla JS).",[599,3105,3107],{"id":3106},"browser-setup","Browser setup",[607,3109,3112],{"className":689,"code":3110,"filename":3111,"language":692,"meta":613,"style":613},"import { initLogger, log } from 'evlog'\nimport { createHttpLogDrain } from 'evlog\u002Fhttp'\n\nconst drain = createHttpLogDrain({\n  drain: { endpoint: '\u002Fv1\u002Fingest' },\n})\ninitLogger({ drain })\n\nlog.info({ action: 'page_view', path: location.pathname })\n","client.ts",[539,3113,3114,3136,3155,3159,3173,3195,3201,3215,3219],{"__ignoreMap":613},[617,3115,3116,3118,3120,3122,3124,3126,3128,3130,3132,3134],{"class":619,"line":620},[617,3117,700],{"class":699},[617,3119,725],{"class":710},[617,3121,728],{"class":703},[617,3123,892],{"class":710},[617,3125,1494],{"class":703},[617,3127,731],{"class":710},[617,3129,734],{"class":699},[617,3131,711],{"class":710},[617,3133,739],{"class":626},[617,3135,717],{"class":710},[617,3137,3138,3140,3142,3145,3147,3149,3151,3153],{"class":619,"line":720},[617,3139,700],{"class":699},[617,3141,725],{"class":710},[617,3143,3144],{"class":703}," 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