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res",[539,828,829],{"class":632},")",[539,831,832],{"class":750}," =>",[539,834,835],{"class":632}," {\n",[539,837,839,842,844,847,849,852,854,857,860,862,864,867,869,871],{"class":541,"line":838},14,[539,840,841],{"class":625},"  req",[539,843,777],{"class":632},[539,845,846],{"class":625},"log",[539,848,777],{"class":632},[539,850,851],{"class":695},"set",[539,853,699],{"class":708},[539,855,856],{"class":632},"{",[539,858,859],{"class":708}," route",[539,861,712],{"class":632},[539,863,633],{"class":632},[539,865,866],{"class":548},"health",[539,868,727],{"class":632},[539,870,653],{"class":632},[539,872,739],{"class":708},[539,874,876,879,881,884,886,888,891,893,897,899],{"class":541,"line":875},15,[539,877,878],{"class":625},"  res",[539,880,777],{"class":632},[539,882,883],{"class":695},"json",[539,885,699],{"class":708},[539,887,856],{"class":632},[539,889,890],{"class":708}," ok",[539,892,712],{"class":632},[539,894,896],{"class":895},"sfNiH"," true",[539,898,653],{"class":632},[539,900,739],{"class":708},[539,902,904,906],{"class":541,"line":903},16,[539,905,736],{"class":632},[539,907,739],{"class":625},[539,909,911],{"class":541,"line":910},17,[539,912,689],{"emptyLinePlaceholder":688},[539,914,916,918,920,923,925,929],{"class":541,"line":915},18,[539,917,774],{"class":625},[539,919,777],{"class":632},[539,921,922],{"class":695},"listen",[539,924,699],{"class":625},[539,926,928],{"class":927},"sbssI","3000",[539,930,739],{"class":625},[932,933,935,939,940,946,947,950,951,954],"callout",{"color":934,"icon":437},"info",[936,937,938],"strong",{},"Using Vite?"," The ",[506,941,942,945],{"href":435},[461,943,944],{},"evlog\u002Fvite"," plugin"," replaces the ",[461,948,949],{},"initLogger()"," call with compile-time auto-initialization, strips ",[461,952,953],{},"log.debug()"," from production builds, and injects source locations.",[457,956,957,958,960],{},"The logger is available on ",[461,959,467],{}," with full TypeScript support via module augmentation, so no extra type annotations are needed.",[517,962,46],{"id":963},"wide-events",[457,965,966],{},"Build up context progressively through your handler. One request = one wide event:",[529,968,970],{"className":611,"code":969,"filename":613,"language":614,"meta":535,"style":535},"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",[461,971,972,1008,1032,1036,1072,1076,1102,1156,1160,1184,1242,1246,1268],{"__ignoreMap":535},[539,973,974,976,978,980,982,984,987,989,991,994,996,998,1000,1002,1004,1006],{"class":541,"line":542},[539,975,774],{"class":625},[539,977,777],{"class":632},[539,979,802],{"class":695},[539,981,699],{"class":625},[539,983,727],{"class":632},[539,985,986],{"class":548},"\u002Fusers\u002F:id",[539,988,727],{"class":632},[539,990,814],{"class":632},[539,992,993],{"class":750}," async",[539,995,817],{"class":632},[539,997,821],{"class":820},[539,999,814],{"class":632},[539,1001,826],{"class":820},[539,1003,829],{"class":632},[539,1005,832],{"class":750},[539,1007,835],{"class":632},[539,1009,1010,1013,1016,1019,1022,1024,1027,1029],{"class":541,"line":642},[539,1011,1012],{"class":750},"  const",[539,1014,1015],{"class":625}," userId",[539,1017,1018],{"class":632}," =",[539,1020,1021],{"class":625}," req",[539,1023,777],{"class":632},[539,1025,1026],{"class":625},"params",[539,1028,777],{"class":632},[539,1030,1031],{"class":625},"id\n",[539,1033,1034],{"class":541,"line":666},[539,1035,689],{"emptyLinePlaceholder":688},[539,1037,1038,1040,1042,1044,1046,1048,1050,1052,1055,1057,1059,1062,1064,1066,1068,1070],{"class":541,"line":685},[539,1039,841],{"class":625},[539,1041,777],{"class":632},[539,1043,846],{"class":625},[539,1045,777],{"class":632},[539,1047,851],{"class":695},[539,1049,699],{"class":708},[539,1051,856],{"class":632},[539,1053,1054],{"class":708}," user",[539,1056,712],{"class":632},[539,1058,647],{"class":632},[539,1060,1061],{"class":708}," id",[539,1063,712],{"class":632},[539,1065,1015],{"class":625},[539,1067,653],{"class":632},[539,1069,653],{"class":632},[539,1071,739],{"class":708},[539,1073,1074],{"class":541,"line":692},[539,1075,689],{"emptyLinePlaceholder":688},[539,1077,1078,1080,1082,1084,1087,1090,1092,1095,1097,1100],{"class":541,"line":705},[539,1079,1012],{"class":750},[539,1081,1054],{"class":625},[539,1083,1018],{"class":632},[539,1085,1086],{"class":621}," await",[539,1088,1089],{"class":625}," db",[539,1091,777],{"class":632},[539,1093,1094],{"class":695},"findUser",[539,1096,699],{"class":708},[539,1098,1099],{"class":625},"userId",[539,1101,739],{"class":708},[539,1103,1104,1106,1108,1110,1112,1114,1116,1118,1120,1122,1124,1127,1129,1131,1133,1136,1138,1141,1143,1145,1147,1150,1152,1154],{"class":541,"line":733},[539,1105,841],{"class":625},[539,1107,777],{"class":632},[539,1109,846],{"class":625},[539,1111,777],{"class":632},[539,1113,851],{"class":695},[539,1115,699],{"class":708},[539,1117,856],{"class":632},[539,1119,1054],{"class":708},[539,1121,712],{"class":632},[539,1123,647],{"class":632},[539,1125,1126],{"class":708}," name",[539,1128,712],{"class":632},[539,1130,1054],{"class":625},[539,1132,777],{"class":632},[539,1134,1135],{"class":625},"name",[539,1137,814],{"class":632},[539,1139,1140],{"class":708}," plan",[539,1142,712],{"class":632},[539,1144,1054],{"class":625},[539,1146,777],{"class":632},[539,1148,1149],{"class":625},"plan",[539,1151,653],{"class":632},[539,1153,653],{"class":632},[539,1155,739],{"class":708},[539,1157,1158],{"class":541,"line":742},[539,1159,689],{"emptyLinePlaceholder":688},[539,1161,1162,1164,1167,1169,1171,1173,1175,1178,1180,1182],{"class":541,"line":747},[539,1163,1012],{"class":750},[539,1165,1166],{"class":625}," orders",[539,1168,1018],{"class":632},[539,1170,1086],{"class":621},[539,1172,1089],{"class":625},[539,1174,777],{"class":632},[539,1176,1177],{"class":695},"findOrders",[539,1179,699],{"class":708},[539,1181,1099],{"class":625},[539,1183,739],{"class":708},[539,1185,1186,1188,1190,1192,1194,1196,1198,1200,1202,1204,1206,1209,1211,1213,1215,1218,1220,1223,1225,1228,1230,1233,1236,1238,1240],{"class":541,"line":766},[539,1187,841],{"class":625},[539,1189,777],{"class":632},[539,1191,846],{"class":625},[539,1193,777],{"class":632},[539,1195,851],{"class":695},[539,1197,699],{"class":708},[539,1199,856],{"class":632},[539,1201,1166],{"class":708},[539,1203,712],{"class":632},[539,1205,647],{"class":632},[539,1207,1208],{"class":708}," count",[539,1210,712],{"class":632},[539,1212,1166],{"class":625},[539,1214,777],{"class":632},[539,1216,1217],{"class":625},"length",[539,1219,814],{"class":632},[539,1221,1222],{"class":708}," totalRevenue",[539,1224,712],{"class":632},[539,1226,1227],{"class":695}," sum",[539,1229,699],{"class":708},[539,1231,1232],{"class":625},"orders",[539,1234,1235],{"class":708},") ",[539,1237,736],{"class":632},[539,1239,653],{"class":632},[539,1241,739],{"class":708},[539,1243,1244],{"class":541,"line":771},[539,1245,689],{"emptyLinePlaceholder":688},[539,1247,1248,1250,1252,1254,1256,1258,1260,1262,1264,1266],{"class":541,"line":790},[539,1249,878],{"class":625},[539,1251,777],{"class":632},[539,1253,883],{"class":695},[539,1255,699],{"class":708},[539,1257,856],{"class":632},[539,1259,1054],{"class":625},[539,1261,814],{"class":632},[539,1263,1166],{"class":625},[539,1265,653],{"class":632},[539,1267,739],{"class":708},[539,1269,1270,1272],{"class":541,"line":795},[539,1271,736],{"class":632},[539,1273,739],{"class":625},[457,1275,1276],{},"All fields are merged into a single wide event emitted when the response finishes:",[529,1278,1281],{"className":531,"code":1279,"filename":1280,"language":534,"meta":535,"style":535},"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",[461,1282,1283,1294,1314,1330],{"__ignoreMap":535},[539,1284,1285,1288,1291],{"class":541,"line":542},[539,1286,1287],{"class":545},"14:58:15",[539,1289,1290],{"class":548}," INFO",[539,1292,1293],{"class":625}," [my-api] GET \u002Fusers\u002Fusr_123 200 in 12ms\n",[539,1295,1296,1299,1302,1305,1308,1311],{"class":541,"line":642},[539,1297,1298],{"class":545},"  ├─",[539,1300,1301],{"class":548}," orders:",[539,1303,1304],{"class":548}," count=",[539,1306,1307],{"class":927},"2",[539,1309,1310],{"class":548}," totalRevenue=",[539,1312,1313],{"class":927},"6298\n",[539,1315,1316,1318,1321,1324,1327],{"class":541,"line":666},[539,1317,1298],{"class":545},[539,1319,1320],{"class":548}," user:",[539,1322,1323],{"class":548}," id=usr_123",[539,1325,1326],{"class":548}," name=Alice",[539,1328,1329],{"class":548}," plan=pro\n",[539,1331,1332,1335,1338],{"class":541,"line":685},[539,1333,1334],{"class":545},"  └─",[539,1336,1337],{"class":548}," requestId:",[539,1339,1340],{"class":548}," 4a8ff3a8-...\n",[517,1342,1344],{"id":1343},"uselogger","useLogger()",[457,1346,1347,1348,1350,1351,1353],{},"Use ",[461,1349,1344],{}," to access the request-scoped logger from anywhere in the call stack without passing ",[461,1352,821],{}," through your service layer:",[529,1355,1358],{"className":611,"code":1356,"filename":1357,"language":614,"meta":535,"style":535},"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",[461,1359,1360,1379,1383,1410,1423,1450,1454,1476,1522,1526,1534],{"__ignoreMap":535},[539,1361,1362,1364,1366,1369,1371,1373,1375,1377],{"class":541,"line":542},[539,1363,622],{"class":621},[539,1365,647],{"class":632},[539,1367,1368],{"class":625}," useLogger",[539,1370,653],{"class":632},[539,1372,656],{"class":621},[539,1374,633],{"class":632},[539,1376,463],{"class":548},[539,1378,639],{"class":632},[539,1380,1381],{"class":541,"line":642},[539,1382,689],{"emptyLinePlaceholder":688},[539,1384,1385,1388,1390,1393,1396,1398,1401,1403,1406,1408],{"class":541,"line":666},[539,1386,1387],{"class":621},"export",[539,1389,993],{"class":750},[539,1391,1392],{"class":750}," function",[539,1394,1395],{"class":695}," findUser",[539,1397,699],{"class":632},[539,1399,1400],{"class":820},"id",[539,1402,712],{"class":632},[539,1404,1405],{"class":545}," string",[539,1407,829],{"class":632},[539,1409,835],{"class":632},[539,1411,1412,1414,1417,1419,1421],{"class":541,"line":685},[539,1413,1012],{"class":750},[539,1415,1416],{"class":625}," log",[539,1418,1018],{"class":632},[539,1420,1368],{"class":695},[539,1422,763],{"class":708},[539,1424,1425,1428,1430,1432,1434,1436,1438,1440,1442,1444,1446,1448],{"class":541,"line":692},[539,1426,1427],{"class":625},"  log",[539,1429,777],{"class":632},[539,1431,851],{"class":695},[539,1433,699],{"class":708},[539,1435,856],{"class":632},[539,1437,1054],{"class":708},[539,1439,712],{"class":632},[539,1441,647],{"class":632},[539,1443,1061],{"class":625},[539,1445,653],{"class":632},[539,1447,653],{"class":632},[539,1449,739],{"class":708},[539,1451,1452],{"class":541,"line":705},[539,1453,689],{"emptyLinePlaceholder":688},[539,1455,1456,1458,1460,1462,1464,1466,1468,1470,1472,1474],{"class":541,"line":733},[539,1457,1012],{"class":750},[539,1459,1054],{"class":625},[539,1461,1018],{"class":632},[539,1463,1086],{"class":621},[539,1465,1089],{"class":625},[539,1467,777],{"class":632},[539,1469,1094],{"class":695},[539,1471,699],{"class":708},[539,1473,1400],{"class":625},[539,1475,739],{"class":708},[539,1477,1478,1480,1482,1484,1486,1488,1490,1492,1494,1496,1498,1500,1502,1504,1506,1508,1510,1512,1514,1516,1518,1520],{"class":541,"line":742},[539,1479,1427],{"class":625},[539,1481,777],{"class":632},[539,1483,851],{"class":695},[539,1485,699],{"class":708},[539,1487,856],{"class":632},[539,1489,1054],{"class":708},[539,1491,712],{"class":632},[539,1493,647],{"class":632},[539,1495,1126],{"class":708},[539,1497,712],{"class":632},[539,1499,1054],{"class":625},[539,1501,777],{"class":632},[539,1503,1135],{"class":625},[539,1505,814],{"class":632},[539,1507,1140],{"class":708},[539,1509,712],{"class":632},[539,1511,1054],{"class":625},[539,1513,777],{"class":632},[539,1515,1149],{"class":625},[539,1517,653],{"class":632},[539,1519,653],{"class":632},[539,1521,739],{"class":708},[539,1523,1524],{"class":541,"line":747},[539,1525,689],{"emptyLinePlaceholder":688},[539,1527,1528,1531],{"class":541,"line":766},[539,1529,1530],{"class":621},"  return",[539,1532,1533],{"class":625}," user\n",[539,1535,1536],{"class":541,"line":771},[539,1537,1538],{"class":632},"}\n",[529,1540,1542],{"className":611,"code":1541,"filename":613,"language":614,"meta":535,"style":535},"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",[461,1543,1544,1563,1567,1601,1627,1642],{"__ignoreMap":535},[539,1545,1546,1548,1550,1552,1554,1556,1558,1561],{"class":541,"line":542},[539,1547,622],{"class":621},[539,1549,647],{"class":632},[539,1551,1395],{"class":625},[539,1553,653],{"class":632},[539,1555,656],{"class":621},[539,1557,633],{"class":632},[539,1559,1560],{"class":548},".\u002Fservices\u002Fuser",[539,1562,639],{"class":632},[539,1564,1565],{"class":541,"line":642},[539,1566,689],{"emptyLinePlaceholder":688},[539,1568,1569,1571,1573,1575,1577,1579,1581,1583,1585,1587,1589,1591,1593,1595,1597,1599],{"class":541,"line":666},[539,1570,774],{"class":625},[539,1572,777],{"class":632},[539,1574,802],{"class":695},[539,1576,699],{"class":625},[539,1578,727],{"class":632},[539,1580,986],{"class":548},[539,1582,727],{"class":632},[539,1584,814],{"class":632},[539,1586,993],{"class":750},[539,1588,817],{"class":632},[539,1590,821],{"class":820},[539,1592,814],{"class":632},[539,1594,826],{"class":820},[539,1596,829],{"class":632},[539,1598,832],{"class":750},[539,1600,835],{"class":632},[539,1602,1603,1605,1607,1609,1611,1613,1615,1617,1619,1621,1623,1625],{"class":541,"line":685},[539,1604,1012],{"class":750},[539,1606,1054],{"class":625},[539,1608,1018],{"class":632},[539,1610,1086],{"class":621},[539,1612,1395],{"class":695},[539,1614,699],{"class":708},[539,1616,821],{"class":625},[539,1618,777],{"class":632},[539,1620,1026],{"class":625},[539,1622,777],{"class":632},[539,1624,1400],{"class":625},[539,1626,739],{"class":708},[539,1628,1629,1631,1633,1635,1637,1640],{"class":541,"line":692},[539,1630,878],{"class":625},[539,1632,777],{"class":632},[539,1634,883],{"class":695},[539,1636,699],{"class":708},[539,1638,1639],{"class":625},"user",[539,1641,739],{"class":708},[539,1643,1644,1646],{"class":541,"line":705},[539,1645,736],{"class":632},[539,1647,739],{"class":625},[457,1649,1650,1651,1653,1654,1656,1657,1659,1660,1663],{},"Both ",[461,1652,467],{}," and ",[461,1655,1344],{}," return the same logger instance. ",[461,1658,1344],{}," uses ",[461,1661,1662],{},"AsyncLocalStorage"," to propagate the logger across async boundaries.",[517,1665,1667,1668,829],{"id":1666},"background-work-logfork","Background work (",[461,1669,1670],{},"log.fork",[457,1672,1673,1674,1677,1678,1683,1684,1686,1687,1690,1691,1694,1695,1653,1698,1701,1702,777],{},"Fire-and-forget async work that finishes ",[936,1675,1676],{},"after"," the response can no longer update the request wide event (the logger is sealed after emit). Use ",[936,1679,1680],{},[461,1681,1682],{},"req.log.fork(label, fn)"," so ",[461,1685,1344],{}," inside ",[461,1688,1689],{},"fn"," targets a ",[936,1692,1693],{},"child"," logger that emits its own event with ",[461,1696,1697],{},"operation",[461,1699,1700],{},"_parentRequestId",". See ",[506,1703,1705],{"href":1704},"\u002Flearn\u002Fwide-events#after-emit-sealing-and-background-work","Wide events — After emit",[529,1707,1709],{"className":611,"code":1708,"filename":613,"language":614,"meta":535,"style":535},"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",[461,1710,1711,1733,1737,1751,1755,1789,1821,1857,1870,1899,1906,1928],{"__ignoreMap":535},[539,1712,1713,1715,1717,1719,1721,1723,1725,1727,1729,1731],{"class":541,"line":542},[539,1714,622],{"class":621},[539,1716,647],{"class":632},[539,1718,552],{"class":625},[539,1720,814],{"class":632},[539,1722,1368],{"class":625},[539,1724,653],{"class":632},[539,1726,656],{"class":621},[539,1728,633],{"class":632},[539,1730,463],{"class":548},[539,1732,639],{"class":632},[539,1734,1735],{"class":541,"line":642},[539,1736,689],{"emptyLinePlaceholder":688},[539,1738,1739,1741,1743,1745,1747,1749],{"class":541,"line":666},[539,1740,774],{"class":625},[539,1742,777],{"class":632},[539,1744,780],{"class":695},[539,1746,699],{"class":625},[539,1748,661],{"class":695},[539,1750,787],{"class":625},[539,1752,1753],{"class":541,"line":685},[539,1754,689],{"emptyLinePlaceholder":688},[539,1756,1757,1759,1761,1764,1766,1768,1771,1773,1775,1777,1779,1781,1783,1785,1787],{"class":541,"line":692},[539,1758,774],{"class":625},[539,1760,777],{"class":632},[539,1762,1763],{"class":695},"post",[539,1765,699],{"class":625},[539,1767,727],{"class":632},[539,1769,1770],{"class":548},"\u002Forders",[539,1772,727],{"class":632},[539,1774,814],{"class":632},[539,1776,817],{"class":632},[539,1778,821],{"class":820},[539,1780,814],{"class":632},[539,1782,826],{"class":820},[539,1784,829],{"class":632},[539,1786,832],{"class":750},[539,1788,835],{"class":632},[539,1790,1791,1793,1795,1797,1799,1801,1803,1805,1808,1810,1812,1815,1817,1819],{"class":541,"line":705},[539,1792,841],{"class":625},[539,1794,777],{"class":632},[539,1796,846],{"class":625},[539,1798,777],{"class":632},[539,1800,851],{"class":695},[539,1802,699],{"class":708},[539,1804,856],{"class":632},[539,1806,1807],{"class":708}," orderId",[539,1809,712],{"class":632},[539,1811,633],{"class":632},[539,1813,1814],{"class":548},"ord_1",[539,1816,727],{"class":632},[539,1818,653],{"class":632},[539,1820,739],{"class":708},[539,1822,1823,1825,1827,1829,1831,1834,1837,1839,1841,1844,1846,1848,1850,1853,1855],{"class":541,"line":733},[539,1824,841],{"class":625},[539,1826,777],{"class":632},[539,1828,846],{"class":625},[539,1830,777],{"class":632},[539,1832,1833],{"class":695},"fork",[539,1835,1836],{"class":632},"!",[539,1838,699],{"class":708},[539,1840,727],{"class":632},[539,1842,1843],{"class":548},"fulfill_order",[539,1845,727],{"class":632},[539,1847,814],{"class":632},[539,1849,993],{"class":750},[539,1851,1852],{"class":632}," ()",[539,1854,832],{"class":750},[539,1856,835],{"class":632},[539,1858,1859,1862,1864,1866,1868],{"class":541,"line":742},[539,1860,1861],{"class":750},"    const",[539,1863,1416],{"class":625},[539,1865,1018],{"class":632},[539,1867,1368],{"class":695},[539,1869,763],{"class":708},[539,1871,1872,1875,1877,1879,1881,1883,1886,1888,1890,1893,1895,1897],{"class":541,"line":747},[539,1873,1874],{"class":625},"    log",[539,1876,777],{"class":632},[539,1878,851],{"class":695},[539,1880,699],{"class":708},[539,1882,856],{"class":632},[539,1884,1885],{"class":708}," step",[539,1887,712],{"class":632},[539,1889,633],{"class":632},[539,1891,1892],{"class":548},"inventory_ok",[539,1894,727],{"class":632},[539,1896,653],{"class":632},[539,1898,739],{"class":708},[539,1900,1901,1904],{"class":541,"line":766},[539,1902,1903],{"class":632},"  }",[539,1905,739],{"class":708},[539,1907,1908,1910,1912,1914,1916,1918,1920,1922,1924,1926],{"class":541,"line":771},[539,1909,878],{"class":625},[539,1911,777],{"class":632},[539,1913,883],{"class":695},[539,1915,699],{"class":708},[539,1917,856],{"class":632},[539,1919,890],{"class":708},[539,1921,712],{"class":632},[539,1923,896],{"class":895},[539,1925,653],{"class":632},[539,1927,739],{"class":708},[539,1929,1930,1932],{"class":541,"line":790},[539,1931,736],{"class":632},[539,1933,739],{"class":625},[517,1935,1937],{"id":1936},"error-handling","Error Handling",[457,1939,1347,1940,1943,1944,1947,1948,1951,1952,1955],{},[461,1941,1942],{},"createError"," for structured errors with ",[461,1945,1946],{},"why",", ",[461,1949,1950],{},"fix",", and ",[461,1953,1954],{},"link"," fields. Express uses a 4-argument error handler middleware:",[529,1957,1959],{"className":611,"code":1958,"filename":613,"language":614,"meta":535,"style":535},"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",[461,1960,1961,1985,1989,2014,2025,2042,2054,2070,2086,2102,2108,2114,2118,2152,2171,2188,2192,2220,2235,2250,2265,2280,2287],{"__ignoreMap":535},[539,1962,1963,1965,1967,1970,1972,1975,1977,1979,1981,1983],{"class":541,"line":542},[539,1964,622],{"class":621},[539,1966,647],{"class":632},[539,1968,1969],{"class":625}," createError",[539,1971,814],{"class":632},[539,1973,1974],{"class":625}," parseError",[539,1976,653],{"class":632},[539,1978,656],{"class":621},[539,1980,633],{"class":632},[539,1982,661],{"class":548},[539,1984,639],{"class":632},[539,1986,1987],{"class":541,"line":642},[539,1988,689],{"emptyLinePlaceholder":688},[539,1990,1991,1993,1995,1997,1999,2001,2004,2006,2008,2010,2012],{"class":541,"line":666},[539,1992,774],{"class":625},[539,1994,777],{"class":632},[539,1996,802],{"class":695},[539,1998,699],{"class":625},[539,2000,727],{"class":632},[539,2002,2003],{"class":548},"\u002Fcheckout",[539,2005,727],{"class":632},[539,2007,814],{"class":632},[539,2009,1852],{"class":632},[539,2011,832],{"class":750},[539,2013,835],{"class":632},[539,2015,2016,2019,2021,2023],{"class":541,"line":685},[539,2017,2018],{"class":621},"  throw",[539,2020,1969],{"class":695},[539,2022,699],{"class":708},[539,2024,702],{"class":632},[539,2026,2027,2030,2032,2034,2037,2039],{"class":541,"line":692},[539,2028,2029],{"class":708},"    message",[539,2031,712],{"class":632},[539,2033,633],{"class":632},[539,2035,2036],{"class":548},"Payment failed",[539,2038,727],{"class":632},[539,2040,2041],{"class":632},",\n",[539,2043,2044,2047,2049,2052],{"class":541,"line":705},[539,2045,2046],{"class":708},"    status",[539,2048,712],{"class":632},[539,2050,2051],{"class":927}," 402",[539,2053,2041],{"class":632},[539,2055,2056,2059,2061,2063,2066,2068],{"class":541,"line":733},[539,2057,2058],{"class":708},"    why",[539,2060,712],{"class":632},[539,2062,633],{"class":632},[539,2064,2065],{"class":548},"Card declined by issuer",[539,2067,727],{"class":632},[539,2069,2041],{"class":632},[539,2071,2072,2075,2077,2079,2082,2084],{"class":541,"line":742},[539,2073,2074],{"class":708},"    fix",[539,2076,712],{"class":632},[539,2078,633],{"class":632},[539,2080,2081],{"class":548},"Try a different payment method",[539,2083,727],{"class":632},[539,2085,2041],{"class":632},[539,2087,2088,2091,2093,2095,2098,2100],{"class":541,"line":747},[539,2089,2090],{"class":708},"    link",[539,2092,712],{"class":632},[539,2094,633],{"class":632},[539,2096,2097],{"class":548},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[539,2099,727],{"class":632},[539,2101,2041],{"class":632},[539,2103,2104,2106],{"class":541,"line":766},[539,2105,1903],{"class":632},[539,2107,739],{"class":708},[539,2109,2110,2112],{"class":541,"line":771},[539,2111,736],{"class":632},[539,2113,739],{"class":625},[539,2115,2116],{"class":541,"line":790},[539,2117,689],{"emptyLinePlaceholder":688},[539,2119,2120,2122,2124,2126,2128,2130,2133,2135,2137,2139,2141,2143,2146,2148,2150],{"class":541,"line":795},[539,2121,774],{"class":625},[539,2123,777],{"class":632},[539,2125,780],{"class":695},[539,2127,699],{"class":625},[539,2129,699],{"class":632},[539,2131,2132],{"class":820},"err",[539,2134,814],{"class":632},[539,2136,1021],{"class":820},[539,2138,814],{"class":632},[539,2140,826],{"class":820},[539,2142,814],{"class":632},[539,2144,2145],{"class":820}," next",[539,2147,829],{"class":632},[539,2149,832],{"class":750},[539,2151,835],{"class":632},[539,2153,2154,2156,2158,2160,2162,2165,2167,2169],{"class":541,"line":838},[539,2155,841],{"class":625},[539,2157,777],{"class":632},[539,2159,846],{"class":625},[539,2161,777],{"class":632},[539,2163,2164],{"class":695},"error",[539,2166,699],{"class":708},[539,2168,2132],{"class":625},[539,2170,739],{"class":708},[539,2172,2173,2175,2178,2180,2182,2184,2186],{"class":541,"line":875},[539,2174,1012],{"class":750},[539,2176,2177],{"class":625}," parsed",[539,2179,1018],{"class":632},[539,2181,1974],{"class":695},[539,2183,699],{"class":708},[539,2185,2132],{"class":625},[539,2187,739],{"class":708},[539,2189,2190],{"class":541,"line":903},[539,2191,689],{"emptyLinePlaceholder":688},[539,2193,2194,2196,2198,2201,2203,2206,2208,2210,2212,2214,2216,2218],{"class":541,"line":910},[539,2195,878],{"class":625},[539,2197,777],{"class":632},[539,2199,2200],{"class":695},"status",[539,2202,699],{"class":708},[539,2204,2205],{"class":625},"parsed",[539,2207,777],{"class":632},[539,2209,2200],{"class":625},[539,2211,829],{"class":708},[539,2213,777],{"class":632},[539,2215,883],{"class":695},[539,2217,699],{"class":708},[539,2219,702],{"class":632},[539,2221,2222,2224,2226,2228,2230,2233],{"class":541,"line":915},[539,2223,2029],{"class":708},[539,2225,712],{"class":632},[539,2227,2177],{"class":625},[539,2229,777],{"class":632},[539,2231,2232],{"class":625},"message",[539,2234,2041],{"class":632},[539,2236,2238,2240,2242,2244,2246,2248],{"class":541,"line":2237},19,[539,2239,2058],{"class":708},[539,2241,712],{"class":632},[539,2243,2177],{"class":625},[539,2245,777],{"class":632},[539,2247,1946],{"class":625},[539,2249,2041],{"class":632},[539,2251,2253,2255,2257,2259,2261,2263],{"class":541,"line":2252},20,[539,2254,2074],{"class":708},[539,2256,712],{"class":632},[539,2258,2177],{"class":625},[539,2260,777],{"class":632},[539,2262,1950],{"class":625},[539,2264,2041],{"class":632},[539,2266,2268,2270,2272,2274,2276,2278],{"class":541,"line":2267},21,[539,2269,2090],{"class":708},[539,2271,712],{"class":632},[539,2273,2177],{"class":625},[539,2275,777],{"class":632},[539,2277,1954],{"class":625},[539,2279,2041],{"class":632},[539,2281,2283,2285],{"class":541,"line":2282},22,[539,2284,1903],{"class":632},[539,2286,739],{"class":708},[539,2288,2290,2292],{"class":541,"line":2289},23,[539,2291,736],{"class":632},[539,2293,739],{"class":625},[457,2295,2296],{},"The error is captured and logged with both the custom context and structured error fields:",[529,2298,2300],{"className":531,"code":2299,"filename":1280,"language":534,"meta":535,"style":535},"14:58:20 ERROR [my-api] GET \u002Fcheckout 402 in 3ms\n  ├─ error: name=EvlogError message=Payment failed status=402\n  └─ requestId: 880a50ac-...\n",[461,2301,2302,2313,2335],{"__ignoreMap":535},[539,2303,2304,2307,2310],{"class":541,"line":542},[539,2305,2306],{"class":545},"14:58:20",[539,2308,2309],{"class":548}," ERROR",[539,2311,2312],{"class":625}," [my-api] GET \u002Fcheckout 402 in 3ms\n",[539,2314,2315,2317,2320,2323,2326,2329,2332],{"class":541,"line":642},[539,2316,1298],{"class":545},[539,2318,2319],{"class":548}," error:",[539,2321,2322],{"class":548}," name=EvlogError",[539,2324,2325],{"class":548}," message=Payment",[539,2327,2328],{"class":548}," failed",[539,2330,2331],{"class":548}," status=",[539,2333,2334],{"class":927},"402\n",[539,2336,2337,2339,2341],{"class":541,"line":666},[539,2338,1334],{"class":545},[539,2340,1337],{"class":548},[539,2342,2343],{"class":548}," 880a50ac-...\n",[517,2345,426],{"id":2346},"configuration",[457,2348,2349,2350,2353,2354,2356],{},"See the ",[506,2351,2352],{"href":427},"Configuration reference"," for all available options (",[461,2355,696],{},", middleware options, sampling, silent mode, etc.).",[517,2358,2360],{"id":2359},"drain-enrichers","Drain & Enrichers",[457,2362,2363],{},"Configure drain adapters and enrichers directly in the middleware options:",[529,2365,2367],{"className":611,"code":2366,"filename":613,"language":614,"meta":535,"style":535},"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",[461,2368,2369,2389,2409,2413,2426,2430,2446,2460,2478,2489,2519,2524],{"__ignoreMap":535},[539,2370,2371,2373,2375,2378,2380,2382,2384,2387],{"class":541,"line":542},[539,2372,622],{"class":621},[539,2374,647],{"class":632},[539,2376,2377],{"class":625}," createAxiomDrain",[539,2379,653],{"class":632},[539,2381,656],{"class":621},[539,2383,633],{"class":632},[539,2385,2386],{"class":548},"evlog\u002Faxiom",[539,2388,639],{"class":632},[539,2390,2391,2393,2395,2398,2400,2402,2404,2407],{"class":541,"line":642},[539,2392,622],{"class":621},[539,2394,647],{"class":632},[539,2396,2397],{"class":625}," createUserAgentEnricher",[539,2399,653],{"class":632},[539,2401,656],{"class":621},[539,2403,633],{"class":632},[539,2405,2406],{"class":548},"evlog\u002Fenrichers",[539,2408,639],{"class":632},[539,2410,2411],{"class":541,"line":666},[539,2412,689],{"emptyLinePlaceholder":688},[539,2414,2415,2417,2420,2422,2424],{"class":541,"line":685},[539,2416,751],{"class":750},[539,2418,2419],{"class":625}," userAgent ",[539,2421,757],{"class":632},[539,2423,2397],{"class":695},[539,2425,763],{"class":625},[539,2427,2428],{"class":541,"line":692},[539,2429,689],{"emptyLinePlaceholder":688},[539,2431,2432,2434,2436,2438,2440,2442,2444],{"class":541,"line":705},[539,2433,774],{"class":625},[539,2435,777],{"class":632},[539,2437,780],{"class":695},[539,2439,699],{"class":625},[539,2441,661],{"class":695},[539,2443,699],{"class":625},[539,2445,702],{"class":632},[539,2447,2448,2451,2453,2455,2458],{"class":541,"line":733},[539,2449,2450],{"class":708},"  drain",[539,2452,712],{"class":632},[539,2454,2377],{"class":695},[539,2456,2457],{"class":625},"()",[539,2459,2041],{"class":632},[539,2461,2462,2465,2467,2469,2472,2474,2476],{"class":541,"line":742},[539,2463,2464],{"class":695},"  enrich",[539,2466,712],{"class":632},[539,2468,817],{"class":632},[539,2470,2471],{"class":820},"ctx",[539,2473,829],{"class":632},[539,2475,832],{"class":750},[539,2477,835],{"class":632},[539,2479,2480,2483,2485,2487],{"class":541,"line":747},[539,2481,2482],{"class":695},"    userAgent",[539,2484,699],{"class":708},[539,2486,2471],{"class":625},[539,2488,739],{"class":708},[539,2490,2491,2494,2496,2499,2501,2504,2506,2509,2511,2514,2516],{"class":541,"line":766},[539,2492,2493],{"class":625},"    ctx",[539,2495,777],{"class":632},[539,2497,2498],{"class":625},"event",[539,2500,777],{"class":632},[539,2502,2503],{"class":625},"region",[539,2505,1018],{"class":632},[539,2507,2508],{"class":625}," process",[539,2510,777],{"class":632},[539,2512,2513],{"class":625},"env",[539,2515,777],{"class":632},[539,2517,2518],{"class":625},"FLY_REGION\n",[539,2520,2521],{"class":541,"line":771},[539,2522,2523],{"class":632},"  },\n",[539,2525,2526,2528],{"class":541,"line":790},[539,2527,736],{"class":632},[539,2529,2530],{"class":625},"))\n",[521,2532,2534],{"id":2533},"pipeline-batching-retry","Pipeline (Batching & Retry)",[457,2536,2537,2538,2541],{},"For production, wrap your adapter with ",[461,2539,2540],{},"createDrainPipeline"," to batch events and retry on failure:",[529,2543,2545],{"className":611,"code":2544,"filename":613,"language":614,"meta":535,"style":535},"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",[461,2546,2547,2569,2587,2607,2611,2635,2664,2683,2689,2708,2712],{"__ignoreMap":535},[539,2548,2549,2551,2554,2556,2559,2561,2563,2565,2567],{"class":541,"line":542},[539,2550,622],{"class":621},[539,2552,2553],{"class":621}," type",[539,2555,647],{"class":632},[539,2557,2558],{"class":625}," DrainContext",[539,2560,653],{"class":632},[539,2562,656],{"class":621},[539,2564,633],{"class":632},[539,2566,661],{"class":548},[539,2568,639],{"class":632},[539,2570,2571,2573,2575,2577,2579,2581,2583,2585],{"class":541,"line":642},[539,2572,622],{"class":621},[539,2574,647],{"class":632},[539,2576,2377],{"class":625},[539,2578,653],{"class":632},[539,2580,656],{"class":621},[539,2582,633],{"class":632},[539,2584,2386],{"class":548},[539,2586,639],{"class":632},[539,2588,2589,2591,2593,2596,2598,2600,2602,2605],{"class":541,"line":666},[539,2590,622],{"class":621},[539,2592,647],{"class":632},[539,2594,2595],{"class":625}," createDrainPipeline",[539,2597,653],{"class":632},[539,2599,656],{"class":621},[539,2601,633],{"class":632},[539,2603,2604],{"class":548},"evlog\u002Fpipeline",[539,2606,639],{"class":632},[539,2608,2609],{"class":541,"line":685},[539,2610,689],{"emptyLinePlaceholder":688},[539,2612,2613,2615,2618,2620,2622,2625,2628,2631,2633],{"class":541,"line":692},[539,2614,751],{"class":750},[539,2616,2617],{"class":625}," pipeline ",[539,2619,757],{"class":632},[539,2621,2595],{"class":695},[539,2623,2624],{"class":632},"\u003C",[539,2626,2627],{"class":545},"DrainContext",[539,2629,2630],{"class":632},">",[539,2632,699],{"class":625},[539,2634,702],{"class":632},[539,2636,2637,2640,2642,2644,2647,2649,2652,2654,2657,2659,2662],{"class":541,"line":705},[539,2638,2639],{"class":708},"  batch",[539,2641,712],{"class":632},[539,2643,647],{"class":632},[539,2645,2646],{"class":708}," size",[539,2648,712],{"class":632},[539,2650,2651],{"class":927}," 50",[539,2653,814],{"class":632},[539,2655,2656],{"class":708}," intervalMs",[539,2658,712],{"class":632},[539,2660,2661],{"class":927}," 5000",[539,2663,730],{"class":632},[539,2665,2666,2669,2671,2673,2676,2678,2681],{"class":541,"line":733},[539,2667,2668],{"class":708},"  retry",[539,2670,712],{"class":632},[539,2672,647],{"class":632},[539,2674,2675],{"class":708}," maxAttempts",[539,2677,712],{"class":632},[539,2679,2680],{"class":927}," 3",[539,2682,730],{"class":632},[539,2684,2685,2687],{"class":541,"line":742},[539,2686,736],{"class":632},[539,2688,739],{"class":625},[539,2690,2691,2693,2696,2698,2701,2703,2706],{"class":541,"line":747},[539,2692,751],{"class":750},[539,2694,2695],{"class":625}," drain ",[539,2697,757],{"class":632},[539,2699,2700],{"class":695}," pipeline",[539,2702,699],{"class":625},[539,2704,2705],{"class":695},"createAxiomDrain",[539,2707,787],{"class":625},[539,2709,2710],{"class":541,"line":766},[539,2711,689],{"emptyLinePlaceholder":688},[539,2713,2714,2716,2718,2720,2722,2724,2726,2728,2730,2732],{"class":541,"line":771},[539,2715,774],{"class":625},[539,2717,777],{"class":632},[539,2719,780],{"class":695},[539,2721,699],{"class":625},[539,2723,661],{"class":695},[539,2725,699],{"class":625},[539,2727,856],{"class":632},[539,2729,2695],{"class":625},[539,2731,736],{"class":632},[539,2733,2530],{"class":625},[932,2735,2736,2737,2740,2741,2744],{"color":934,"icon":13},"Call ",[461,2738,2739],{},"drain.flush()"," on server shutdown to ensure all buffered events are sent. See the ",[506,2742,2743],{"href":417},"Pipeline docs"," for all options.",[517,2746,2748],{"id":2747},"tail-sampling","Tail Sampling",[457,2750,1347,2751,2754],{},[461,2752,2753],{},"keep"," to force-retain specific events regardless of head sampling:",[529,2756,2758],{"className":611,"code":2757,"filename":613,"language":614,"meta":535,"style":535},"app.use(evlog({\n  drain: createAxiomDrain(),\n  keep: (ctx) => {\n    if (ctx.duration && ctx.duration > 2000) ctx.shouldKeep = true\n  },\n}))\n",[461,2759,2760,2776,2788,2805,2849,2853],{"__ignoreMap":535},[539,2761,2762,2764,2766,2768,2770,2772,2774],{"class":541,"line":542},[539,2763,774],{"class":625},[539,2765,777],{"class":632},[539,2767,780],{"class":695},[539,2769,699],{"class":625},[539,2771,661],{"class":695},[539,2773,699],{"class":625},[539,2775,702],{"class":632},[539,2777,2778,2780,2782,2784,2786],{"class":541,"line":642},[539,2779,2450],{"class":708},[539,2781,712],{"class":632},[539,2783,2377],{"class":695},[539,2785,2457],{"class":625},[539,2787,2041],{"class":632},[539,2789,2790,2793,2795,2797,2799,2801,2803],{"class":541,"line":666},[539,2791,2792],{"class":695},"  keep",[539,2794,712],{"class":632},[539,2796,817],{"class":632},[539,2798,2471],{"class":820},[539,2800,829],{"class":632},[539,2802,832],{"class":750},[539,2804,835],{"class":632},[539,2806,2807,2810,2812,2814,2816,2819,2822,2825,2827,2829,2832,2835,2837,2839,2841,2844,2846],{"class":541,"line":685},[539,2808,2809],{"class":621},"    if",[539,2811,817],{"class":708},[539,2813,2471],{"class":625},[539,2815,777],{"class":632},[539,2817,2818],{"class":625},"duration",[539,2820,2821],{"class":632}," &&",[539,2823,2824],{"class":625}," ctx",[539,2826,777],{"class":632},[539,2828,2818],{"class":625},[539,2830,2831],{"class":632}," >",[539,2833,2834],{"class":927}," 2000",[539,2836,1235],{"class":708},[539,2838,2471],{"class":625},[539,2840,777],{"class":632},[539,2842,2843],{"class":625},"shouldKeep",[539,2845,1018],{"class":632},[539,2847,2848],{"class":895}," true\n",[539,2850,2851],{"class":541,"line":692},[539,2852,2523],{"class":632},[539,2854,2855,2857],{"class":541,"line":705},[539,2856,736],{"class":632},[539,2858,2530],{"class":625},[517,2860,2862],{"id":2861},"route-filtering","Route Filtering",[457,2864,2865,2866,1653,2869,2872],{},"Control which routes are logged with ",[461,2867,2868],{},"include",[461,2870,2871],{},"exclude"," patterns:",[529,2874,2876],{"className":611,"code":2875,"filename":613,"language":614,"meta":535,"style":535},"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",[461,2877,2878,2894,2916,2944,2953,2980,3006,3010],{"__ignoreMap":535},[539,2879,2880,2882,2884,2886,2888,2890,2892],{"class":541,"line":542},[539,2881,774],{"class":625},[539,2883,777],{"class":632},[539,2885,780],{"class":695},[539,2887,699],{"class":625},[539,2889,661],{"class":695},[539,2891,699],{"class":625},[539,2893,702],{"class":632},[539,2895,2896,2899,2901,2904,2906,2909,2911,2914],{"class":541,"line":642},[539,2897,2898],{"class":708},"  include",[539,2900,712],{"class":632},[539,2902,2903],{"class":625}," [",[539,2905,727],{"class":632},[539,2907,2908],{"class":548},"\u002Fapi\u002F**",[539,2910,727],{"class":632},[539,2912,2913],{"class":625},"]",[539,2915,2041],{"class":632},[539,2917,2918,2921,2923,2925,2927,2930,2932,2934,2936,2938,2940,2942],{"class":541,"line":666},[539,2919,2920],{"class":708},"  exclude",[539,2922,712],{"class":632},[539,2924,2903],{"class":625},[539,2926,727],{"class":632},[539,2928,2929],{"class":548},"\u002F_internal\u002F**",[539,2931,727],{"class":632},[539,2933,814],{"class":632},[539,2935,633],{"class":632},[539,2937,809],{"class":548},[539,2939,727],{"class":632},[539,2941,2913],{"class":625},[539,2943,2041],{"class":632},[539,2945,2946,2949,2951],{"class":541,"line":685},[539,2947,2948],{"class":708},"  routes",[539,2950,712],{"class":632},[539,2952,835],{"class":632},[539,2954,2955,2958,2961,2963,2965,2967,2969,2971,2973,2976,2978],{"class":541,"line":692},[539,2956,2957],{"class":632},"    '",[539,2959,2960],{"class":708},"\u002Fapi\u002Fauth\u002F**",[539,2962,727],{"class":632},[539,2964,712],{"class":632},[539,2966,647],{"class":632},[539,2968,717],{"class":708},[539,2970,712],{"class":632},[539,2972,633],{"class":632},[539,2974,2975],{"class":548},"auth-service",[539,2977,727],{"class":632},[539,2979,730],{"class":632},[539,2981,2982,2984,2987,2989,2991,2993,2995,2997,2999,3002,3004],{"class":541,"line":705},[539,2983,2957],{"class":632},[539,2985,2986],{"class":708},"\u002Fapi\u002Fpayment\u002F**",[539,2988,727],{"class":632},[539,2990,712],{"class":632},[539,2992,647],{"class":632},[539,2994,717],{"class":708},[539,2996,712],{"class":632},[539,2998,633],{"class":632},[539,3000,3001],{"class":548},"payment-service",[539,3003,727],{"class":632},[539,3005,730],{"class":632},[539,3007,3008],{"class":541,"line":733},[539,3009,2523],{"class":632},[539,3011,3012,3014],{"class":541,"line":742},[539,3013,736],{"class":632},[539,3015,2530],{"class":625},[517,3017,3019],{"id":3018},"client-side-logging","Client-Side Logging",[457,3021,1347,3022,3025],{},[461,3023,3024],{},"evlog\u002Fhttp"," to send structured logs from any frontend to your Express server. This works with any client framework (React, Vue, Svelte, vanilla JS).",[521,3027,3029],{"id":3028},"browser-setup","Browser setup",[529,3031,3034],{"className":611,"code":3032,"filename":3033,"language":614,"meta":535,"style":535},"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",[461,3035,3036,3058,3077,3081,3095,3117,3123,3137,3141],{"__ignoreMap":535},[539,3037,3038,3040,3042,3044,3046,3048,3050,3052,3054,3056],{"class":541,"line":542},[539,3039,622],{"class":621},[539,3041,647],{"class":632},[539,3043,650],{"class":625},[539,3045,814],{"class":632},[539,3047,1416],{"class":625},[539,3049,653],{"class":632},[539,3051,656],{"class":621},[539,3053,633],{"class":632},[539,3055,661],{"class":548},[539,3057,639],{"class":632},[539,3059,3060,3062,3064,3067,3069,3071,3073,3075],{"class":541,"line":642},[539,3061,622],{"class":621},[539,3063,647],{"class":632},[539,3065,3066],{"class":625}," createHttpLogDrain",[539,3068,653],{"class":632},[539,3070,656],{"class":621},[539,3072,633],{"class":632},[539,3074,3024],{"class":548},[539,3076,639],{"class":632},[539,3078,3079],{"class":541,"line":666},[539,3080,689],{"emptyLinePlaceholder":688},[539,3082,3083,3085,3087,3089,3091,3093],{"class":541,"line":685},[539,3084,751],{"class":750},[539,3086,2695],{"class":625},[539,3088,757],{"class":632},[539,3090,3066],{"class":695},[539,3092,699],{"class":625},[539,3094,702],{"class":632},[539,3096,3097,3099,3101,3103,3106,3108,3110,3113,3115],{"class":541,"line":692},[539,3098,2450],{"class":708},[539,3100,712],{"class":632},[539,3102,647],{"class":632},[539,3104,3105],{"class":708}," endpoint",[539,3107,712],{"class":632},[539,3109,633],{"class":632},[539,3111,3112],{"class":548},"\u002Fv1\u002Fingest",[539,3114,727],{"class":632},[539,3116,730],{"class":632},[539,3118,3119,3121],{"class":541,"line":705},[539,3120,736],{"class":632},[539,3122,739],{"class":625},[539,3124,3125,3127,3129,3131,3133,3135],{"class":541,"line":733},[539,3126,696],{"class":695},[539,3128,699],{"class":625},[539,3130,856],{"class":632},[539,3132,2695],{"class":625},[539,3134,736],{"class":632},[539,3136,739],{"class":625},[539,3138,3139],{"class":541,"line":742},[539,3140,689],{"emptyLinePlaceholder":688},[539,3142,3143,3145,3147,3149,3151,3153,3156,3158,3160,3163,3165,3167,3170,3172,3175,3177,3180,3182],{"class":541,"line":747},[539,3144,846],{"class":625},[539,3146,777],{"class":632},[539,3148,934],{"class":695},[539,3150,699],{"class":625},[539,3152,856],{"class":632},[539,3154,3155],{"class":708}," action",[539,3157,712],{"class":632},[539,3159,633],{"class":632},[539,3161,3162],{"class":548},"page_view",[539,3164,727],{"class":632},[539,3166,814],{"class":632},[539,3168,3169],{"class":708}," path",[539,3171,712],{"class":632},[539,3173,3174],{"class":625}," location",[539,3176,777],{"class":632},[539,3178,3179],{"class":625},"pathname ",[539,3181,736],{"class":632},[539,3183,739],{"class":625},[521,3185,3187],{"id":3186},"ingest-endpoint","Ingest endpoint",[457,3189,3190,3191,3194],{},"Add a POST route to receive batched ",[461,3192,3193],{},"DrainContext[]"," from the browser:",[529,3196,3198],{"className":611,"code":3197,"filename":613,"language":614,"meta":535,"style":535},"import type { DrainContext } from 'evlog'\n\napp.post('\u002Fv1\u002Fingest', express.json(), (req, res) => {\n  const batch = req.body as DrainContext[]\n  for (const ctx of batch) {\n    console.log('[BROWSER]', JSON.stringify(ctx.event))\n  }\n  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