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Accumulate context progressively, emit when done.",[712,713,714,847],"code-group",{},[556,715,718],{"className":558,"code":716,"filename":717,"language":561,"meta":562,"style":562},"import { createLogger } from 'evlog'\n\nconst log = createLogger({ jobId: 'sync-001', queue: 'emails' })\nlog.set({ batch: { size: 50, processed: 50 } })\nlog.emit()\n","scripts\u002Fsync-job.ts",[513,719,720,739,743,791,834],{"__ignoreMap":562},[566,721,722,724,726,729,731,733,735,737],{"class":568,"line":569},[566,723,573],{"class":572},[566,725,577],{"class":576},[566,727,728],{"class":580}," createLogger",[566,730,584],{"class":576},[566,732,587],{"class":572},[566,734,590],{"class":576},[566,736,594],{"class":593},[566,738,597],{"class":576},[566,740,741],{"class":568,"line":600},[566,742,604],{"emptyLinePlaceholder":603},[566,744,745,749,752,755,757,759,761,764,766,768,771,773,775,778,780,782,785,787,789],{"class":568,"line":607},[566,746,748],{"class":747},"spNyl","const",[566,750,751],{"class":580}," log ",[566,753,754],{"class":576},"=",[566,756,728],{"class":614},[566,758,617],{"class":580},[566,760,653],{"class":576},[566,762,763],{"class":656}," jobId",[566,765,660],{"class":576},[566,767,590],{"class":576},[566,769,770],{"class":593},"sync-001",[566,772,620],{"class":576},[566,774,628],{"class":576},[566,776,777],{"class":656}," queue",[566,779,660],{"class":576},[566,781,590],{"class":576},[566,783,784],{"class":593},"emails",[566,786,620],{"class":576},[566,788,584],{"class":576},[566,790,638],{"class":580},[566,792,793,795,797,800,802,804,807,809,811,814,816,819,821,824,826,828,830,832],{"class":568,"line":641},[566,794,550],{"class":580},[566,796,499],{"class":576},[566,798,799],{"class":614},"set",[566,801,617],{"class":580},[566,803,653],{"class":576},[566,805,806],{"class":656}," batch",[566,808,660],{"class":576},[566,810,577],{"class":576},[566,812,813],{"class":656}," size",[566,815,660],{"class":576},[566,817,818],{"class":691}," 50",[566,820,628],{"class":576},[566,822,823],{"class":656}," processed",[566,825,660],{"class":576},[566,827,818],{"class":691},[566,829,584],{"class":576},[566,831,584],{"class":576},[566,833,638],{"class":580},[566,835,837,839,841,844],{"class":568,"line":836},5,[566,838,550],{"class":580},[566,840,499],{"class":576},[566,842,843],{"class":614},"emit",[566,845,846],{"class":580},"()\n",[556,848,851],{"className":558,"code":849,"filename":850,"language":561,"meta":562,"style":562},"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",[513,852,853,872,876,920,967],{"__ignoreMap":562},[566,854,855,857,859,862,864,866,868,870],{"class":568,"line":569},[566,856,573],{"class":572},[566,858,577],{"class":576},[566,860,861],{"class":580}," createRequestLogger",[566,863,584],{"class":576},[566,865,587],{"class":572},[566,867,590],{"class":576},[566,869,594],{"class":593},[566,871,597],{"class":576},[566,873,874],{"class":568,"line":600},[566,875,604],{"emptyLinePlaceholder":603},[566,877,878,880,882,884,886,888,890,893,895,897,900,902,904,907,909,911,914,916,918],{"class":568,"line":607},[566,879,748],{"class":747},[566,881,751],{"class":580},[566,883,754],{"class":576},[566,885,861],{"class":614},[566,887,617],{"class":580},[566,889,653],{"class":576},[566,891,892],{"class":656}," method",[566,894,660],{"class":576},[566,896,590],{"class":576},[566,898,899],{"class":593},"POST",[566,901,620],{"class":576},[566,903,628],{"class":576},[566,905,906],{"class":656}," path",[566,908,660],{"class":576},[566,910,590],{"class":576},[566,912,913],{"class":593},"\u002Fapi\u002Fcheckout",[566,915,620],{"class":576},[566,917,584],{"class":576},[566,919,638],{"class":580},[566,921,922,924,926,928,930,932,935,937,939,942,944,947,949,952,954,956,959,961,963,965],{"class":568,"line":641},[566,923,550],{"class":580},[566,925,499],{"class":576},[566,927,799],{"class":614},[566,929,617],{"class":580},[566,931,653],{"class":576},[566,933,934],{"class":656}," user",[566,936,660],{"class":576},[566,938,577],{"class":576},[566,940,941],{"class":656}," id",[566,943,660],{"class":576},[566,945,946],{"class":691}," 1",[566,948,628],{"class":576},[566,950,951],{"class":656}," plan",[566,953,660],{"class":576},[566,955,590],{"class":576},[566,957,958],{"class":593},"pro",[566,960,620],{"class":576},[566,962,584],{"class":576},[566,964,584],{"class":576},[566,966,638],{"class":580},[566,968,969,971,973,975],{"class":568,"line":836},[566,970,550],{"class":580},[566,972,499],{"class":576},[566,974,843],{"class":614},[566,976,846],{"class":580},[471,978,979,981,982,984,985,520,988,991,992,499],{},[513,980,707],{}," is a thin wrapper around ",[513,983,703],{}," that pre-populates ",[513,986,987],{},"method",[513,989,990],{},"path",", and ",[513,993,994],{},"requestId",[544,996,998],{"id":997},"request-logging-framework-middleware","Request Logging (framework middleware)",[471,1000,1001,1002,1005],{},"Framework integrations create a wide event logger automatically on each request. ",[513,1003,1004],{},"useLogger(event)"," retrieves the logger that's already attached to the request context:",[556,1007,1010],{"className":558,"code":1008,"filename":1009,"language":561,"meta":562,"style":562},"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",[513,1011,1012,1031,1035,1066,1084,1127,1147,1154],{"__ignoreMap":562},[566,1013,1014,1016,1018,1021,1023,1025,1027,1029],{"class":568,"line":569},[566,1015,573],{"class":572},[566,1017,577],{"class":576},[566,1019,1020],{"class":580}," useLogger",[566,1022,584],{"class":576},[566,1024,587],{"class":572},[566,1026,590],{"class":576},[566,1028,594],{"class":593},[566,1030,597],{"class":576},[566,1032,1033],{"class":568,"line":600},[566,1034,604],{"emptyLinePlaceholder":603},[566,1036,1037,1040,1043,1046,1048,1051,1054,1058,1060,1063],{"class":568,"line":607},[566,1038,1039],{"class":572},"export",[566,1041,1042],{"class":572}," default",[566,1044,1045],{"class":614}," defineEventHandler",[566,1047,617],{"class":580},[566,1049,1050],{"class":747},"async",[566,1052,1053],{"class":576}," (",[566,1055,1057],{"class":1056},"sHdIc","event",[566,1059,551],{"class":576},[566,1061,1062],{"class":747}," =>",[566,1064,1065],{"class":576}," {\n",[566,1067,1068,1071,1073,1076,1078,1080,1082],{"class":568,"line":641},[566,1069,1070],{"class":747},"  const",[566,1072,581],{"class":580},[566,1074,1075],{"class":576}," =",[566,1077,1020],{"class":614},[566,1079,617],{"class":656},[566,1081,1057],{"class":580},[566,1083,638],{"class":656},[566,1085,1086,1089,1091,1093,1095,1097,1099,1101,1103,1105,1107,1109,1111,1113,1115,1117,1119,1121,1123,1125],{"class":568,"line":836},[566,1087,1088],{"class":580},"  log",[566,1090,499],{"class":576},[566,1092,799],{"class":614},[566,1094,617],{"class":656},[566,1096,653],{"class":576},[566,1098,934],{"class":656},[566,1100,660],{"class":576},[566,1102,577],{"class":576},[566,1104,941],{"class":656},[566,1106,660],{"class":576},[566,1108,946],{"class":691},[566,1110,628],{"class":576},[566,1112,951],{"class":656},[566,1114,660],{"class":576},[566,1116,590],{"class":576},[566,1118,958],{"class":593},[566,1120,620],{"class":576},[566,1122,584],{"class":576},[566,1124,584],{"class":576},[566,1126,638],{"class":656},[566,1128,1130,1133,1135,1138,1140,1144],{"class":568,"line":1129},6,[566,1131,1132],{"class":572},"  return",[566,1134,577],{"class":576},[566,1136,1137],{"class":656}," success",[566,1139,660],{"class":576},[566,1141,1143],{"class":1142},"sfNiH"," true",[566,1145,1146],{"class":576}," }\n",[566,1148,1150],{"class":568,"line":1149},7,[566,1151,1153],{"class":1152},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[566,1155,1157,1160],{"class":568,"line":1156},8,[566,1158,1159],{"class":576},"}",[566,1161,638],{"class":580},[483,1163,1164,1166,1167,520,1170,520,1173,1176,1177,1179],{"color":485,"icon":13},[513,1165,1004],{}," 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 (",[513,1168,1169],{},"useLogger",[513,1171,1172],{},"req.log",[513,1174,1175],{},"c.get('log')",", etc.). In Nuxt, ",[513,1178,1169],{}," is auto-imported.",[501,1181,1183],{"id":1182},"when-to-use-what","When to use what",[1185,1186,1187,1209],"table",{},[1188,1189,1190],"thead",{},[1191,1192,1193,1196,1200,1206],"tr",{},[1194,1195],"th",{},[1194,1197,1198],{},[513,1199,550],{},[1194,1201,1202,704,1204],{},[513,1203,703],{},[513,1205,707],{},[1194,1207,1208],{},"Framework middleware",[1210,1211,1212,1229,1249,1268,1283],"tbody",{},[1191,1213,1214,1220,1223,1226],{},[1215,1216,1217],"td",{},[475,1218,1219],{},"Use case",[1215,1221,1222],{},"Quick one-off events",[1215,1224,1225],{},"Scripts, jobs, workers, queues, HTTP without a framework",[1215,1227,1228],{},"API routes with a framework integration",[1191,1230,1231,1236,1239,1245],{},[1215,1232,1233],{},[475,1234,1235],{},"Context",[1215,1237,1238],{},"Single call",[1215,1240,1241,1242],{},"Accumulate with ",[513,1243,1244],{},"set()",[1215,1246,1241,1247],{},[513,1248,1244],{},[1191,1250,1251,1256,1259,1265],{},[1215,1252,1253],{},[475,1254,1255],{},"Emit",[1215,1257,1258],{},"Immediate",[1215,1260,1261,1262],{},"Manual ",[513,1263,1264],{},"emit()",[1215,1266,1267],{},"Automatic on response end",[1191,1269,1270,1274,1277,1280],{},[1215,1271,1272],{},[475,1273,56],{},[1215,1275,1276],{},"None",[1215,1278,1279],{},"You manage it",[1215,1281,1282],{},"Framework manages it",[1191,1284,1285,1290,1293,1295],{},[1215,1286,1287],{},[475,1288,1289],{},"Output",[1215,1291,1292],{},"Console + drain",[1215,1294,1292],{},[1215,1296,1297],{},"Console + drain + enrich",[544,1299,1301],{"id":1300},"by-context","By context",[1185,1303,1304,1316],{},[1188,1305,1306],{},[1191,1307,1308,1310,1313],{},[1194,1309,1235],{},[1194,1311,1312],{},"Best fit",[1194,1314,1315],{},"Why",[1210,1317,1318,1336,1351,1372,1393,1411,1435,1453,1469,1489,1504],{},[1191,1319,1320,1325,1333],{},[1215,1321,1322],{},[475,1323,1324],{},"HTTP route in Nuxt \u002F Next \u002F Hono \u002F Express \u002F …",[1215,1326,1327,1329,1330],{},[513,1328,1004],{}," via ",[493,1331,1332],{"href":163},"framework integration",[1215,1334,1335],{},"One wide event per request, auto-emitted on response end",[1191,1337,1338,1343,1348],{},[1215,1339,1340],{},[475,1341,1342],{},"HTTP handler without a framework",[1215,1344,1345],{},[513,1346,1347],{},"createRequestLogger({ method, path })",[1215,1349,1350],{},"Same shape as framework middleware, manual emit",[1191,1352,1353,1358,1369],{},[1215,1354,1355],{},[475,1356,1357],{},"CLI tool \u002F one-shot script",[1215,1359,1360,1363,1364,1366,1367],{},[513,1361,1362],{},"log.*"," for steps + ",[513,1365,703],{}," for the run summary — see ",[493,1368,227],{"href":228},[1215,1370,1371],{},"Pretty in dev, structured in CI, one summary event for the whole run",[1191,1373,1374,1379,1390],{},[1215,1375,1376],{},[475,1377,1378],{},"Published library",[1215,1380,1381,1383,1384,1387,1388],{},[513,1382,703],{}," only — never ",[513,1385,1386],{},"initLogger"," — see ",[493,1389,227],{"href":228},[1215,1391,1392],{},"Don't pollute the host app's global config or force a drain on consumers",[1191,1394,1395,1400,1408],{},[1215,1396,1397],{},[475,1398,1399],{},"Background job \u002F queue worker \u002F cron",[1215,1401,1402,1405,1406],{},[513,1403,1404],{},"createLogger({ jobId, queue })"," per invocation — see ",[493,1407,227],{"href":228},[1215,1409,1410],{},"One wide event per job run, perfect for retry analysis",[1191,1412,1413,1418,1428],{},[1215,1414,1415],{},[475,1416,1417],{},"Cloudflare Worker \u002F edge function",[1215,1419,1420,1423,1424,1387,1426],{},[513,1421,1422],{},"createWorkersLogger(req)"," or ",[513,1425,707],{},[493,1427,222],{"href":223},[1215,1429,1430,1431,1434],{},"Per-request event, no ",[513,1432,1433],{},"process"," globals required",[1191,1436,1437,1441,1450],{},[1215,1438,1439],{},[475,1440,241],{},[1215,1442,1443,1445,1446,1405,1448],{},[513,1444,1386],{}," once + ",[513,1447,703],{},[493,1449,241],{"href":242},[1215,1451,1452],{},"Cold-start init, per-event scope, drain flush in the handler",[1191,1454,1455,1460,1466],{},[1215,1456,1457],{},[475,1458,1459],{},"Batch \u002F pipeline step",[1215,1461,1462,1465],{},[513,1463,1464],{},"createLogger({ step })"," per stage",[1215,1467,1468],{},"One event per stage with inputs and outputs side by side",[1191,1470,1471,1476,1486],{},[1215,1472,1473],{},[475,1474,1475],{},"AI agent \u002F LLM call",[1215,1477,1478,1480,1481],{},[513,1479,703],{}," + ",[493,1482,1483],{"href":266},[513,1484,1485],{},"createAILogger",[1215,1487,1488],{},"Token usage, tool calls, streaming metrics on the same wide event",[1191,1490,1491,1496,1501],{},[1215,1492,1493],{},[475,1494,1495],{},"Library function called inside a request",[1215,1497,1498,1500],{},[513,1499,1004],{}," from caller, or accept a logger as argument",[1215,1502,1503],{},"Inherit the parent's request context, contribute to the same wide event",[1191,1505,1506,1511,1516],{},[1215,1507,1508],{},[475,1509,1510],{},"Shared workspace package",[1215,1512,1513,1514],{},"Treat it like a library — see ",[493,1515,227],{"href":228},[1215,1517,1518,1519,1521,1522,1524],{},"Host app owns ",[513,1520,1386],{}," \u002F drain; packages use ",[513,1523,703],{}," or accept a logger",[483,1526,1528,1529,496,1531,1533],{"color":485,"icon":1527},"i-lucide-lightbulb","None of these is an \"upgrade\" of another. Use ",[513,1530,550],{},[513,1532,703],{}," in the same file when it makes sense — they share the global drain, redaction, and types.",[501,1535,1537],{"id":1536},"shared-foundation","Shared foundation",[471,1539,1540],{},"All three modes share the same foundation:",[1542,1543,1544,1555,1563,1585,1590,1596],"ul",{},[1545,1546,1547,1550,1551,1554],"li",{},[475,1548,1549],{},"Pretty output"," in development, ",[475,1552,1553],{},"JSON"," in production (default, no configuration needed)",[1545,1556,1557,1559,1560],{},[475,1558,430],{}," to send events to Axiom, Sentry, PostHog, and more — see ",[493,1561,1562],{"href":95},"Integrate \u002F Adapters",[1545,1564,1565,1568,1569,520,1572,991,1575,1578,1579,1584],{},[475,1566,1567],{},"Structured errors"," with ",[513,1570,1571],{},"why",[513,1573,1574],{},"fix",[513,1576,1577],{},"link",", plus optional backend-only ",[475,1580,1581],{},[513,1582,1583],{},"internal"," for logs",[1545,1586,1587,1589],{},[475,1588,61],{}," (head + tail) to control log volume in production",[1545,1591,1592,1595],{},[475,1593,1594],{},"Redaction"," that wipes secrets before they ever leave the process",[1545,1597,1598,1601],{},[475,1599,1600],{},"Zero dependencies",", ~6 kB gzip",[501,1603,1605],{"id":1604},"the-rest-of-this-section","The rest of this section",[471,1607,1608],{},"After the three modes, the rest of Learn covers the concepts that show up across every mode:",[1542,1610,1611,1632,1637,1645,1650,1663],{},[1545,1612,1613,1615,1616,520,1618,520,1620,520,1622,1624,1625,1628,1629],{},[493,1614,51],{"href":52}," — ",[513,1617,1571],{},[513,1619,1574],{},[513,1621,1577],{},[513,1623,1583],{},", and how ",[513,1626,1627],{},"createError"," differs from ",[513,1630,1631],{},"throw new Error",[1545,1633,1634,1636],{},[493,1635,76],{"href":77}," — typed error \u002F audit catalogs that survive refactors",[1545,1638,1639,1641,1642,1644],{},[493,1640,56],{"href":57}," — exactly what happens between ",[513,1643,1264],{}," and your drain",[1545,1646,1647,1649],{},[493,1648,61],{"href":62}," — keep all errors and slow requests; drop healthy noise",[1545,1651,1652,1654,1655,1658,1659,1662],{},[493,1653,71],{"href":72}," — augment ",[513,1656,1657],{},"RequestLogger"," so ",[513,1660,1661],{},"log.set"," is autocompleted",[1545,1664,1665,1667,1668,520,1671,520,1674,1677],{},[493,1666,1594],{"href":67}," — the rules that strip ",[513,1669,1670],{},"authorization",[513,1672,1673],{},"password",[513,1675,1676],{},"token",", etc. before drain",[471,1679,1680,1681,1683],{},"When you're done with Learn, head to ",[493,1682,81],{"href":163}," to wire evlog into your stack.",[1685,1686,1687],"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 code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}",{"title":562,"searchDepth":600,"depth":600,"links":1689},[1690,1691,1698,1701,1702],{"id":503,"depth":600,"text":504},{"id":541,"depth":600,"text":542,"children":1692},[1693,1695,1697],{"id":546,"depth":607,"text":1694},"Simple Logging (log)",{"id":699,"depth":607,"text":1696},"Wide Events (createLogger \u002F createRequestLogger)",{"id":997,"depth":607,"text":998},{"id":1182,"depth":600,"text":1183,"children":1699},[1700],{"id":1300,"depth":607,"text":1301},{"id":1536,"depth":600,"text":1537},{"id":1604,"depth":600,"text":1605},"The mental model — three logging modes, the wide event lifecycle, sampling, typed fields, and redaction. 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