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createLogger",[547,711,565],{"class":557},[547,713,568],{"class":553},[547,715,571],{"class":557},[547,717,575],{"class":574},[547,719,578],{"class":557},[547,721,722],{"class":549,"line":581},[547,723,585],{"emptyLinePlaceholder":584},[547,725,726,730,733,736,738,740,742,745,747,749,752,754,756,759,761,763,766,768,770],{"class":549,"line":588},[547,727,729],{"class":728},"spNyl","const",[547,731,732],{"class":561}," log ",[547,734,735],{"class":557},"=",[547,737,709],{"class":595},[547,739,598],{"class":561},[547,741,634],{"class":557},[547,743,744],{"class":637}," jobId",[547,746,641],{"class":557},[547,748,571],{"class":557},[547,750,751],{"class":574},"sync-001",[547,753,601],{"class":557},[547,755,609],{"class":557},[547,757,758],{"class":637}," 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processed",[547,806,641],{"class":557},[547,808,799],{"class":672},[547,810,565],{"class":557},[547,812,565],{"class":557},[547,814,619],{"class":561},[547,816,818,820,822,825],{"class":549,"line":817},5,[547,819,531],{"class":561},[547,821,480],{"class":557},[547,823,824],{"class":595},"emit",[547,826,827],{"class":561},"()\n",[537,829,832],{"className":539,"code":830,"filename":831,"language":542,"meta":543,"style":543},"import { createRequestLogger } from 'evlog'\n\nconst log = createRequestLogger({ method: 'POST', path: '\u002Fapi\u002Fcheckout' })\nlog.set({ user: { id: 1, plan: 'pro' } })\nlog.emit()\n","src\u002Fworker.ts",[494,833,834,853,857,901,948],{"__ignoreMap":543},[547,835,836,838,840,843,845,847,849,851],{"class":549,"line":550},[547,837,554],{"class":553},[547,839,558],{"class":557},[547,841,842],{"class":561}," createRequestLogger",[547,844,565],{"class":557},[547,846,568],{"class":553},[547,848,571],{"class":557},[547,850,575],{"class":574},[547,852,578],{"class":557},[547,854,855],{"class":549,"line":581},[547,856,585],{"emptyLinePlaceholder":584},[547,858,859,861,863,865,867,869,871,874,876,878,881,883,885,888,890,892,895,897,899],{"class":549,"line":588},[547,860,729],{"class":728},[547,862,732],{"class":561},[547,864,735],{"class":557},[547,866,842],{"class":595},[547,868,598],{"class":561},[547,870,634],{"class":557},[547,872,873],{"class":637}," method",[547,875,641],{"class":557},[547,877,571],{"class":557},[547,879,880],{"class":574},"POST",[547,882,601],{"class":557},[547,884,609],{"class":557},[547,886,887],{"class":637}," path",[547,889,641],{"class":557},[547,891,571],{"class":557},[547,893,894],{"class":574},"\u002Fapi\u002Fcheckout",[547,896,601],{"class":557},[547,898,565],{"class":557},[547,900,619],{"class":561},[547,902,903,905,907,909,911,913,916,918,920,923,925,928,930,933,935,937,940,942,944,946],{"class":549,"line":622},[547,904,531],{"class":561},[547,906,480],{"class":557},[547,908,780],{"class":595},[547,910,598],{"class":561},[547,912,634],{"class":557},[547,914,915],{"class":637}," user",[547,917,641],{"class":557},[547,919,558],{"class":557},[547,921,922],{"class":637}," id",[547,924,641],{"class":557},[547,926,927],{"class":672}," 1",[547,929,609],{"class":557},[547,931,932],{"class":637}," plan",[547,934,641],{"class":557},[547,936,571],{"class":557},[547,938,939],{"class":574},"pro",[547,941,601],{"class":557},[547,943,565],{"class":557},[547,945,565],{"class":557},[547,947,619],{"class":561},[547,949,950,952,954,956],{"class":549,"line":817},[547,951,531],{"class":561},[547,953,480],{"class":557},[547,955,824],{"class":595},[547,957,827],{"class":561},[461,959,960,962,963,965,966,501,969,972,973,480],{},[494,961,688],{}," is a thin wrapper around ",[494,964,684],{}," that pre-populates ",[494,967,968],{},"method",[494,970,971],{},"path",", and ",[494,974,975],{},"requestId",[525,977,979],{"id":978},"request-logging-framework-middleware","Request Logging (framework middleware)",[461,981,982,983,986],{},"Framework integrations create a wide event logger automatically on each request. ",[494,984,985],{},"useLogger(event)"," retrieves the logger that's already attached to the request context:",[537,988,991],{"className":539,"code":989,"filename":990,"language":542,"meta":543,"style":543},"import { useLogger } from 'evlog'\n\nexport default defineEventHandler(async (event) => {\n  const log = useLogger(event)\n  log.set({ user: { id: 1, plan: 'pro' } })\n  return { success: true }\n  \u002F\u002F auto-emitted on response end\n})\n","server\u002Fapi\u002Fcheckout.post.ts",[494,992,993,1012,1016,1047,1065,1108,1128,1135],{"__ignoreMap":543},[547,994,995,997,999,1002,1004,1006,1008,1010],{"class":549,"line":550},[547,996,554],{"class":553},[547,998,558],{"class":557},[547,1000,1001],{"class":561}," useLogger",[547,1003,565],{"class":557},[547,1005,568],{"class":553},[547,1007,571],{"class":557},[547,1009,575],{"class":574},[547,1011,578],{"class":557},[547,1013,1014],{"class":549,"line":581},[547,1015,585],{"emptyLinePlaceholder":584},[547,1017,1018,1021,1024,1027,1029,1032,1035,1039,1041,1044],{"class":549,"line":588},[547,1019,1020],{"class":553},"export",[547,1022,1023],{"class":553}," default",[547,1025,1026],{"class":595}," defineEventHandler",[547,1028,598],{"class":561},[547,1030,1031],{"class":728},"async",[547,1033,1034],{"class":557}," (",[547,1036,1038],{"class":1037},"sHdIc","event",[547,1040,532],{"class":557},[547,1042,1043],{"class":728}," =>",[547,1045,1046],{"class":557}," {\n",[547,1048,1049,1052,1054,1057,1059,1061,1063],{"class":549,"line":622},[547,1050,1051],{"class":728},"  const",[547,1053,562],{"class":561},[547,1055,1056],{"class":557}," =",[547,1058,1001],{"class":595},[547,1060,598],{"class":637},[547,1062,1038],{"class":561},[547,1064,619],{"class":637},[547,1066,1067,1070,1072,1074,1076,1078,1080,1082,1084,1086,1088,1090,1092,1094,1096,1098,1100,1102,1104,1106],{"class":549,"line":817},[547,1068,1069],{"class":561},"  log",[547,1071,480],{"class":557},[547,1073,780],{"class":595},[547,1075,598],{"class":637},[547,1077,634],{"class":557},[547,1079,915],{"class":637},[547,1081,641],{"class":557},[547,1083,558],{"class":557},[547,1085,922],{"class":637},[547,1087,641],{"class":557},[547,1089,927],{"class":672},[547,1091,609],{"class":557},[547,1093,932],{"class":637},[547,1095,641],{"class":557},[547,1097,571],{"class":557},[547,1099,939],{"class":574},[547,1101,601],{"class":557},[547,1103,565],{"class":557},[547,1105,565],{"class":557},[547,1107,619],{"class":637},[547,1109,1111,1114,1116,1119,1121,1125],{"class":549,"line":1110},6,[547,1112,1113],{"class":553},"  return",[547,1115,558],{"class":557},[547,1117,1118],{"class":637}," success",[547,1120,641],{"class":557},[547,1122,1124],{"class":1123},"sfNiH"," true",[547,1126,1127],{"class":557}," }\n",[547,1129,1131],{"class":549,"line":1130},7,[547,1132,1134],{"class":1133},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[547,1136,1138,1141],{"class":549,"line":1137},8,[547,1139,1140],{"class":557},"}",[547,1142,619],{"class":561},[465,1144,1145,1147,1148,501,1151,501,1154,1157,1158,1160],{"color":467,"icon":13},[494,1146,985],{}," doesn't create a logger, it retrieves the one the framework middleware already attached to the event. Each framework has its own way to access it (",[494,1149,1150],{},"useLogger",[494,1152,1153],{},"req.log",[494,1155,1156],{},"c.get('log')",", etc.). In Nuxt, ",[494,1159,1150],{}," is auto-imported.",[482,1162,1164],{"id":1163},"when-to-use-what","When to Use What",[1166,1167,1168,1190],"table",{},[1169,1170,1171],"thead",{},[1172,1173,1174,1177,1181,1187],"tr",{},[1175,1176],"th",{},[1175,1178,1179],{},[494,1180,531],{},[1175,1182,1183,685,1185],{},[494,1184,684],{},[494,1186,688],{},[1175,1188,1189],{},"Framework middleware",[1191,1192,1193,1211,1231,1250,1265],"tbody",{},[1172,1194,1195,1202,1205,1208],{},[1196,1197,1198],"td",{},[1199,1200,1201],"strong",{},"Use case",[1196,1203,1204],{},"Quick one-off events",[1196,1206,1207],{},"Scripts, jobs, workers, queues, HTTP without a framework",[1196,1209,1210],{},"API routes with a framework integration",[1172,1212,1213,1218,1221,1227],{},[1196,1214,1215],{},[1199,1216,1217],{},"Context",[1196,1219,1220],{},"Single call",[1196,1222,1223,1224],{},"Accumulate with ",[494,1225,1226],{},"set()",[1196,1228,1223,1229],{},[494,1230,1226],{},[1172,1232,1233,1238,1241,1247],{},[1196,1234,1235],{},[1199,1236,1237],{},"Emit",[1196,1239,1240],{},"Immediate",[1196,1242,1243,1244],{},"Manual ",[494,1245,1246],{},"emit()",[1196,1248,1249],{},"Automatic on response end",[1172,1251,1252,1256,1259,1262],{},[1196,1253,1254],{},[1199,1255,165],{},[1196,1257,1258],{},"None",[1196,1260,1261],{},"You manage it",[1196,1263,1264],{},"Framework manages it",[1172,1266,1267,1272,1275,1277],{},[1196,1268,1269],{},[1199,1270,1271],{},"Output",[1196,1273,1274],{},"Console + drain",[1196,1276,1274],{},[1196,1278,1279],{},"Console + drain + enrich",[525,1281,1283],{"id":1282},"by-context","By context",[1166,1285,1286,1298],{},[1169,1287,1288],{},[1172,1289,1290,1292,1295],{},[1175,1291,1217],{},[1175,1293,1294],{},"Best fit",[1175,1296,1297],{},"Why",[1191,1299,1300,1318,1333,1354,1375,1393,1417,1435,1451,1471,1486],{},[1172,1301,1302,1307,1315],{},[1196,1303,1304],{},[1199,1305,1306],{},"HTTP route in Nuxt \u002F Next \u002F Hono \u002F Express \u002F …",[1196,1308,1309,1311,1312],{},[494,1310,985],{}," via ",[474,1313,1314],{"href":207},"framework integration",[1196,1316,1317],{},"One wide event per request, auto-emitted on response end",[1172,1319,1320,1325,1330],{},[1196,1321,1322],{},[1199,1323,1324],{},"HTTP handler without a framework",[1196,1326,1327],{},[494,1328,1329],{},"createRequestLogger({ method, path })",[1196,1331,1332],{},"Same shape as framework middleware, manual emit",[1172,1334,1335,1340,1351],{},[1196,1336,1337],{},[1199,1338,1339],{},"CLI tool \u002F one-shot script",[1196,1341,1342,1345,1346,1348,1349],{},[494,1343,1344],{},"log.*"," for steps + ",[494,1347,684],{}," for the run summary — see ",[474,1350,271],{"href":272},[1196,1352,1353],{},"Pretty in dev, structured in CI, one summary event for the whole run",[1172,1355,1356,1361,1372],{},[1196,1357,1358],{},[1199,1359,1360],{},"Published library",[1196,1362,1363,1365,1366,1369,1370],{},[494,1364,684],{}," only — never ",[494,1367,1368],{},"initLogger"," — see ",[474,1371,271],{"href":272},[1196,1373,1374],{},"Don't pollute the host app's global config or force a drain on consumers",[1172,1376,1377,1382,1390],{},[1196,1378,1379],{},[1199,1380,1381],{},"Background job \u002F queue worker \u002F cron",[1196,1383,1384,1387,1388],{},[494,1385,1386],{},"createLogger({ jobId, queue })"," per invocation — see ",[474,1389,271],{"href":272},[1196,1391,1392],{},"One wide event per job run, perfect for retry analysis",[1172,1394,1395,1400,1410],{},[1196,1396,1397],{},[1199,1398,1399],{},"Cloudflare Worker \u002F edge function",[1196,1401,1402,1405,1406,1369,1408],{},[494,1403,1404],{},"createWorkersLogger(req)"," or ",[494,1407,688],{},[474,1409,266],{"href":267},[1196,1411,1412,1413,1416],{},"Per-request event, no ",[494,1414,1415],{},"process"," globals required",[1172,1418,1419,1423,1432],{},[1196,1420,1421],{},[1199,1422,280],{},[1196,1424,1425,1427,1428,1387,1430],{},[494,1426,1368],{}," once + ",[494,1429,684],{},[474,1431,280],{"href":281},[1196,1433,1434],{},"Cold-start init, per-event scope, drain flush in the handler",[1172,1436,1437,1442,1448],{},[1196,1438,1439],{},[1199,1440,1441],{},"Batch \u002F pipeline step",[1196,1443,1444,1447],{},[494,1445,1446],{},"createLogger({ step })"," per stage",[1196,1449,1450],{},"One event per stage with inputs and outputs side by side",[1172,1452,1453,1458,1468],{},[1196,1454,1455],{},[1199,1456,1457],{},"AI agent \u002F LLM call",[1196,1459,1460,1462,1463],{},[494,1461,684],{}," + ",[474,1464,1465],{"href":77},[494,1466,1467],{},"createAILogger",[1196,1469,1470],{},"Token usage, tool calls, streaming metrics on the same wide event",[1172,1472,1473,1478,1483],{},[1196,1474,1475],{},[1199,1476,1477],{},"Library function called inside a request",[1196,1479,1480,1482],{},[494,1481,985],{}," from caller, or accept a logger as argument",[1196,1484,1485],{},"Inherit the parent's request context, contribute to the same wide event",[1172,1487,1488,1493,1498],{},[1196,1489,1490],{},[1199,1491,1492],{},"Shared workspace package",[1196,1494,1495,1496],{},"Treat it like a library — see ",[474,1497,271],{"href":272},[1196,1499,1500,1501,1503,1504,1506],{},"Host app owns ",[494,1502,1368],{}," \u002F drain; packages use ",[494,1505,684],{}," or accept a logger",[465,1508,1510,1511,477,1513,1515],{"color":467,"icon":1509},"i-lucide-lightbulb","None of these is an \"upgrade\" of another. Use ",[494,1512,531],{},[494,1514,684],{}," in the same file when it makes sense — they share the global drain, redaction, and types.",[482,1517,1519],{"id":1518},"shared-features","Shared Features",[461,1521,1522],{},"All three modes share the same foundation:",[1524,1525,1526,1537,1542,1564,1569],"ul",{},[1527,1528,1529,1532,1533,1536],"li",{},[1199,1530,1531],{},"Pretty output"," in development, ",[1199,1534,1535],{},"JSON"," in production (default, no configuration needed)",[1527,1538,1539,1541],{},[1199,1540,348],{}," to send events to Axiom, Sentry, PostHog, and more",[1527,1543,1544,1547,1548,501,1551,972,1554,1557,1558,1563],{},[1199,1545,1546],{},"Structured errors"," with ",[494,1549,1550],{},"why",[494,1552,1553],{},"fix",[494,1555,1556],{},"link",", plus optional backend-only ",[1199,1559,1560],{},[494,1561,1562],{},"internal"," for logs",[1527,1565,1566,1568],{},[1199,1567,175],{}," to control log volume in production",[1527,1570,1571,1574],{},[1199,1572,1573],{},"Zero dependencies",", ~6 kB gzip",[482,1576,1578],{"id":1577},"next-steps","Next Steps",[1524,1580,1581,1589,1594,1599],{},[1527,1582,1583,1585,1586,1588],{},[474,1584,46],{"href":47},": The ",[494,1587,531],{}," API in detail",[1527,1590,1591,1593],{},[474,1592,51],{"href":52},": Accumulating context and emitting events",[1527,1595,1596,1598],{},[474,1597,56],{"href":57},": Errors with actionable context",[1527,1600,1601,1603],{},[474,1602,202],{"href":207},": Auto-managed request logging per framework",[1605,1606,1607],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki 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