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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":591,"path":592,"stem":593,"icon":567},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":595,"path":596,"stem":597,"icon":567},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":599,"path":600,"stem":601,"icon":567},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":603,"title":604,"body":605,"description":2447,"extension":2448,"links":2449,"meta":2454,"navigation":2455,"path":42,"seo":2456,"stem":43,"__hash__":2457},"docs\u002F2.learn\u002F0.overview.md","Learn evlog",{"type":606,"value":607,"toc":2432},"minimark",[608,617,620,625,638,643,677,681,690,693,835,846,849,1115,1133,1137,1144,1901,1919,1923,2037,2041,2264,2272,2276,2279,2340,2344,2347,2416,2428],[609,610,611,612,616],"p",{},"This section is the ",[613,614,615],"strong",{},"mental model"," of evlog. By the end, you'll know exactly what evlog does, when each API fits, and how an event flows from your code to your drain.",[609,618,619],{},"If you're new, read it in order. If you've already shipped with evlog, jump to the page that matches your question.",[621,622,624],"callout",{"color":623,"icon":13},"info","All three modes coexist in the same logger. Pick per call. There is no upgrade path, no advanced mode, no toggle to flip. Same drains, same redaction, same types underneath.",[621,626,629,630,634,635,637],{"color":627,"icon":628},"neutral","i-lucide-globe","Not running an HTTP framework? See ",[631,632,633],"a",{"href":301},"Standalone TypeScript"," and ",[631,636,295],{"href":296},".",[639,640,642],"h2",{"id":641},"the-three-logging-modes","The three logging modes",[644,645,646,669,672],"card-group",{},[647,648,649,650,654,655,658,659,658,662,658,665,668],"card",{"color":627,"icon":49,"title":46,"to":47},"A fully-featured general-purpose logger. Replaces ",[651,652,653],"code",{},"console.log",", consola, pino, or winston with ",[651,656,657],{},"log.info",", ",[651,660,661],{},"log.error",[651,663,664],{},"log.warn",[651,666,667],{},"log.debug",", with the same level filtering, drain pipeline, redaction, and pretty\u002FJSON output.",[647,670,671],{"color":627,"icon":54,"title":51,"to":52},"Accumulate context over a unit of work (a script, job, queue task, or request) then emit a single comprehensive event.",[647,673,676],{"color":627,"icon":674,"title":675,"to":236},"i-lucide-git-branch","Request Logging","Auto-managed wide events scoped to HTTP requests. Framework middleware creates the logger and emits it for you.",[639,678,680],{"id":679},"compare-the-three-at-a-glance","Compare the three at a glance",[682,683,685,686,689],"h3",{"id":684},"simple-logging-log","Simple Logging (",[651,687,688],{},"log",")",[609,691,692],{},"One event per call. No accumulation, no lifecycle management.",[694,695,701],"pre",{"className":696,"code":697,"filename":698,"language":699,"meta":700,"style":700},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { log } from 'evlog'\n\nlog.info('auth', 'User logged in')\nlog.error({ action: 'payment', error: 'card_declined', userId: 42 })\n","src\u002Findex.ts","typescript","",[651,702,703,736,743,777],{"__ignoreMap":700},[704,705,708,712,716,720,723,726,729,733],"span",{"class":706,"line":707},"line",1,[704,709,711],{"class":710},"s7zQu","import",[704,713,715],{"class":714},"sMK4o"," {",[704,717,719],{"class":718},"sTEyZ"," log",[704,721,722],{"class":714}," }",[704,724,725],{"class":710}," from",[704,727,728],{"class":714}," '",[704,730,732],{"class":731},"sfazB","evlog",[704,734,735],{"class":714},"'\n",[704,737,739],{"class":706,"line":738},2,[704,740,742],{"emptyLinePlaceholder":741},true,"\n",[704,744,746,748,750,753,756,759,762,764,767,769,772,774],{"class":706,"line":745},3,[704,747,688],{"class":718},[704,749,637],{"class":714},[704,751,623],{"class":752},"s2Zo4",[704,754,755],{"class":718},"(",[704,757,758],{"class":714},"'",[704,760,761],{"class":731},"auth",[704,763,758],{"class":714},[704,765,766],{"class":714},",",[704,768,728],{"class":714},[704,770,771],{"class":731},"User logged in",[704,773,758],{"class":714},[704,775,776],{"class":718},")\n",[704,778,780,782,784,787,789,792,796,799,801,804,806,808,811,813,815,818,820,822,825,827,831,833],{"class":706,"line":779},4,[704,781,688],{"class":718},[704,783,637],{"class":714},[704,785,786],{"class":752},"error",[704,788,755],{"class":718},[704,790,791],{"class":714},"{",[704,793,795],{"class":794},"swJcz"," action",[704,797,798],{"class":714},":",[704,800,728],{"class":714},[704,802,803],{"class":731},"payment",[704,805,758],{"class":714},[704,807,766],{"class":714},[704,809,810],{"class":794}," error",[704,812,798],{"class":714},[704,814,728],{"class":714},[704,816,817],{"class":731},"card_declined",[704,819,758],{"class":714},[704,821,766],{"class":714},[704,823,824],{"class":794}," userId",[704,826,798],{"class":714},[704,828,830],{"class":829},"sbssI"," 42",[704,832,722],{"class":714},[704,834,776],{"class":718},[682,836,838,839,842,843,689],{"id":837},"wide-events-createlogger-createrequestlogger","Wide Events (",[651,840,841],{},"createLogger"," \u002F ",[651,844,845],{},"createRequestLogger",[609,847,848],{},"One event per unit of work. Accumulate context progressively, emit when done.",[850,851,852,985],"code-group",{},[694,853,856],{"className":696,"code":854,"filename":855,"language":699,"meta":700,"style":700},"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",[651,857,858,877,881,929,972],{"__ignoreMap":700},[704,859,860,862,864,867,869,871,873,875],{"class":706,"line":707},[704,861,711],{"class":710},[704,863,715],{"class":714},[704,865,866],{"class":718}," createLogger",[704,868,722],{"class":714},[704,870,725],{"class":710},[704,872,728],{"class":714},[704,874,732],{"class":731},[704,876,735],{"class":714},[704,878,879],{"class":706,"line":738},[704,880,742],{"emptyLinePlaceholder":741},[704,882,883,887,890,893,895,897,899,902,904,906,909,911,913,916,918,920,923,925,927],{"class":706,"line":745},[704,884,886],{"class":885},"spNyl","const",[704,888,889],{"class":718}," log ",[704,891,892],{"class":714},"=",[704,894,866],{"class":752},[704,896,755],{"class":718},[704,898,791],{"class":714},[704,900,901],{"class":794}," jobId",[704,903,798],{"class":714},[704,905,728],{"class":714},[704,907,908],{"class":731},"sync-001",[704,910,758],{"class":714},[704,912,766],{"class":714},[704,914,915],{"class":794}," queue",[704,917,798],{"class":714},[704,919,728],{"class":714},[704,921,922],{"class":731},"emails",[704,924,758],{"class":714},[704,926,722],{"class":714},[704,928,776],{"class":718},[704,930,931,933,935,938,940,942,945,947,949,952,954,957,959,962,964,966,968,970],{"class":706,"line":779},[704,932,688],{"class":718},[704,934,637],{"class":714},[704,936,937],{"class":752},"set",[704,939,755],{"class":718},[704,941,791],{"class":714},[704,943,944],{"class":794}," batch",[704,946,798],{"class":714},[704,948,715],{"class":714},[704,950,951],{"class":794}," size",[704,953,798],{"class":714},[704,955,956],{"class":829}," 50",[704,958,766],{"class":714},[704,960,961],{"class":794}," processed",[704,963,798],{"class":714},[704,965,956],{"class":829},[704,967,722],{"class":714},[704,969,722],{"class":714},[704,971,776],{"class":718},[704,973,975,977,979,982],{"class":706,"line":974},5,[704,976,688],{"class":718},[704,978,637],{"class":714},[704,980,981],{"class":752},"emit",[704,983,984],{"class":718},"()\n",[694,986,989],{"className":696,"code":987,"filename":988,"language":699,"meta":700,"style":700},"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",[651,990,991,1010,1014,1058,1105],{"__ignoreMap":700},[704,992,993,995,997,1000,1002,1004,1006,1008],{"class":706,"line":707},[704,994,711],{"class":710},[704,996,715],{"class":714},[704,998,999],{"class":718}," createRequestLogger",[704,1001,722],{"class":714},[704,1003,725],{"class":710},[704,1005,728],{"class":714},[704,1007,732],{"class":731},[704,1009,735],{"class":714},[704,1011,1012],{"class":706,"line":738},[704,1013,742],{"emptyLinePlaceholder":741},[704,1015,1016,1018,1020,1022,1024,1026,1028,1031,1033,1035,1038,1040,1042,1045,1047,1049,1052,1054,1056],{"class":706,"line":745},[704,1017,886],{"class":885},[704,1019,889],{"class":718},[704,1021,892],{"class":714},[704,1023,999],{"class":752},[704,1025,755],{"class":718},[704,1027,791],{"class":714},[704,1029,1030],{"class":794}," method",[704,1032,798],{"class":714},[704,1034,728],{"class":714},[704,1036,1037],{"class":731},"POST",[704,1039,758],{"class":714},[704,1041,766],{"class":714},[704,1043,1044],{"class":794}," path",[704,1046,798],{"class":714},[704,1048,728],{"class":714},[704,1050,1051],{"class":731},"\u002Fapi\u002Fcheckout",[704,1053,758],{"class":714},[704,1055,722],{"class":714},[704,1057,776],{"class":718},[704,1059,1060,1062,1064,1066,1068,1070,1073,1075,1077,1080,1082,1085,1087,1090,1092,1094,1097,1099,1101,1103],{"class":706,"line":779},[704,1061,688],{"class":718},[704,1063,637],{"class":714},[704,1065,937],{"class":752},[704,1067,755],{"class":718},[704,1069,791],{"class":714},[704,1071,1072],{"class":794}," user",[704,1074,798],{"class":714},[704,1076,715],{"class":714},[704,1078,1079],{"class":794}," id",[704,1081,798],{"class":714},[704,1083,1084],{"class":829}," 1",[704,1086,766],{"class":714},[704,1088,1089],{"class":794}," plan",[704,1091,798],{"class":714},[704,1093,728],{"class":714},[704,1095,1096],{"class":731},"pro",[704,1098,758],{"class":714},[704,1100,722],{"class":714},[704,1102,722],{"class":714},[704,1104,776],{"class":718},[704,1106,1107,1109,1111,1113],{"class":706,"line":974},[704,1108,688],{"class":718},[704,1110,637],{"class":714},[704,1112,981],{"class":752},[704,1114,984],{"class":718},[609,1116,1117,1119,1120,1122,1123,658,1126,1129,1130,637],{},[651,1118,845],{}," is a thin wrapper around ",[651,1121,841],{}," that pre-populates ",[651,1124,1125],{},"method",[651,1127,1128],{},"path",", and ",[651,1131,1132],{},"requestId",[682,1134,1136],{"id":1135},"request-logging-framework-middleware","Request Logging (framework middleware)",[609,1138,1139,1140,1143],{},"Framework integrations create a wide event logger automatically on each request. ",[651,1141,1142],{},"useLogger(event)"," retrieves the logger that's already attached to the request context:",[1145,1146,1147,1308,1466,1619,1764],"framework-tabs",{},[694,1148,1151],{"className":696,"code":1149,"filename":240,"language":699,"meta":1150,"style":700},"import { useLogger } from 'evlog'\n\nexport default defineEventHandler(async (event) => {\n  const log = useLogger(event)\n\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",[651,1152,1153,1172,1176,1207,1225,1229,1273,1293,1300],{"__ignoreMap":700},[704,1154,1155,1157,1159,1162,1164,1166,1168,1170],{"class":706,"line":707},[704,1156,711],{"class":710},[704,1158,715],{"class":714},[704,1160,1161],{"class":718}," useLogger",[704,1163,722],{"class":714},[704,1165,725],{"class":710},[704,1167,728],{"class":714},[704,1169,732],{"class":731},[704,1171,735],{"class":714},[704,1173,1174],{"class":706,"line":738},[704,1175,742],{"emptyLinePlaceholder":741},[704,1177,1178,1181,1184,1187,1189,1192,1195,1199,1201,1204],{"class":706,"line":745},[704,1179,1180],{"class":710},"export",[704,1182,1183],{"class":710}," default",[704,1185,1186],{"class":752}," defineEventHandler",[704,1188,755],{"class":718},[704,1190,1191],{"class":885},"async",[704,1193,1194],{"class":714}," (",[704,1196,1198],{"class":1197},"sHdIc","event",[704,1200,689],{"class":714},[704,1202,1203],{"class":885}," =>",[704,1205,1206],{"class":714}," {\n",[704,1208,1209,1212,1214,1217,1219,1221,1223],{"class":706,"line":779},[704,1210,1211],{"class":885},"  const",[704,1213,719],{"class":718},[704,1215,1216],{"class":714}," =",[704,1218,1161],{"class":752},[704,1220,755],{"class":794},[704,1222,1198],{"class":718},[704,1224,776],{"class":794},[704,1226,1227],{"class":706,"line":974},[704,1228,742],{"emptyLinePlaceholder":741},[704,1230,1232,1235,1237,1239,1241,1243,1245,1247,1249,1251,1253,1255,1257,1259,1261,1263,1265,1267,1269,1271],{"class":706,"line":1231},6,[704,1233,1234],{"class":718},"  log",[704,1236,637],{"class":714},[704,1238,937],{"class":752},[704,1240,755],{"class":794},[704,1242,791],{"class":714},[704,1244,1072],{"class":794},[704,1246,798],{"class":714},[704,1248,715],{"class":714},[704,1250,1079],{"class":794},[704,1252,798],{"class":714},[704,1254,1084],{"class":829},[704,1256,766],{"class":714},[704,1258,1089],{"class":794},[704,1260,798],{"class":714},[704,1262,728],{"class":714},[704,1264,1096],{"class":731},[704,1266,758],{"class":714},[704,1268,722],{"class":714},[704,1270,722],{"class":714},[704,1272,776],{"class":794},[704,1274,1276,1279,1281,1284,1286,1290],{"class":706,"line":1275},7,[704,1277,1278],{"class":710},"  return",[704,1280,715],{"class":714},[704,1282,1283],{"class":794}," success",[704,1285,798],{"class":714},[704,1287,1289],{"class":1288},"sfNiH"," true",[704,1291,1292],{"class":714}," }\n",[704,1294,1296],{"class":706,"line":1295},8,[704,1297,1299],{"class":1298},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[704,1301,1303,1306],{"class":706,"line":1302},9,[704,1304,1305],{"class":714},"}",[704,1307,776],{"class":718},[694,1309,1312],{"className":696,"code":1310,"filename":255,"language":699,"meta":1311,"style":700},"import { defineHandler } from 'nitro\u002Fh3'\nimport { useLogger } from 'evlog\u002Fnitro\u002Fv3'\n\nexport default defineHandler(async (event) => {\n  const log = useLogger(event)\n\n  log.set({ user: { id: 1, plan: 'pro' } })\n  return { success: true }\n  \u002F\u002F auto-emitted on response end\n})\n","routes\u002Fapi\u002Fcheckout.post.ts",[651,1313,1314,1334,1353,1357,1379,1395,1399,1441,1455,1459],{"__ignoreMap":700},[704,1315,1316,1318,1320,1323,1325,1327,1329,1332],{"class":706,"line":707},[704,1317,711],{"class":710},[704,1319,715],{"class":714},[704,1321,1322],{"class":718}," defineHandler",[704,1324,722],{"class":714},[704,1326,725],{"class":710},[704,1328,728],{"class":714},[704,1330,1331],{"class":731},"nitro\u002Fh3",[704,1333,735],{"class":714},[704,1335,1336,1338,1340,1342,1344,1346,1348,1351],{"class":706,"line":738},[704,1337,711],{"class":710},[704,1339,715],{"class":714},[704,1341,1161],{"class":718},[704,1343,722],{"class":714},[704,1345,725],{"class":710},[704,1347,728],{"class":714},[704,1349,1350],{"class":731},"evlog\u002Fnitro\u002Fv3",[704,1352,735],{"class":714},[704,1354,1355],{"class":706,"line":745},[704,1356,742],{"emptyLinePlaceholder":741},[704,1358,1359,1361,1363,1365,1367,1369,1371,1373,1375,1377],{"class":706,"line":779},[704,1360,1180],{"class":710},[704,1362,1183],{"class":710},[704,1364,1322],{"class":752},[704,1366,755],{"class":718},[704,1368,1191],{"class":885},[704,1370,1194],{"class":714},[704,1372,1198],{"class":1197},[704,1374,689],{"class":714},[704,1376,1203],{"class":885},[704,1378,1206],{"class":714},[704,1380,1381,1383,1385,1387,1389,1391,1393],{"class":706,"line":974},[704,1382,1211],{"class":885},[704,1384,719],{"class":718},[704,1386,1216],{"class":714},[704,1388,1161],{"class":752},[704,1390,755],{"class":794},[704,1392,1198],{"class":718},[704,1394,776],{"class":794},[704,1396,1397],{"class":706,"line":1231},[704,1398,742],{"emptyLinePlaceholder":741},[704,1400,1401,1403,1405,1407,1409,1411,1413,1415,1417,1419,1421,1423,1425,1427,1429,1431,1433,1435,1437,1439],{"class":706,"line":1275},[704,1402,1234],{"class":718},[704,1404,637],{"class":714},[704,1406,937],{"class":752},[704,1408,755],{"class":794},[704,1410,791],{"class":714},[704,1412,1072],{"class":794},[704,1414,798],{"class":714},[704,1416,715],{"class":714},[704,1418,1079],{"class":794},[704,1420,798],{"class":714},[704,1422,1084],{"class":829},[704,1424,766],{"class":714},[704,1426,1089],{"class":794},[704,1428,798],{"class":714},[704,1430,728],{"class":714},[704,1432,1096],{"class":731},[704,1434,758],{"class":714},[704,1436,722],{"class":714},[704,1438,722],{"class":714},[704,1440,776],{"class":794},[704,1442,1443,1445,1447,1449,1451,1453],{"class":706,"line":1295},[704,1444,1278],{"class":710},[704,1446,715],{"class":714},[704,1448,1283],{"class":794},[704,1450,798],{"class":714},[704,1452,1289],{"class":1288},[704,1454,1292],{"class":714},[704,1456,1457],{"class":706,"line":1302},[704,1458,1299],{"class":1298},[704,1460,1462,1464],{"class":706,"line":1461},10,[704,1463,1305],{"class":714},[704,1465,776],{"class":718},[694,1467,1470],{"className":696,"code":1468,"filename":245,"language":699,"meta":1469,"style":700},"import { withEvlog, useLogger } from '@\u002Flib\u002Fevlog'\n\nexport const POST = withEvlog(async () => {\n  const log = useLogger()\n\n  log.set({ user: { id: 1, plan: 'pro' } })\n  return Response.json({ success: true })\n  \u002F\u002F auto-emitted on response end\n})\n","app\u002Fapi\u002Fcheckout\u002Froute.ts",[651,1471,1472,1496,1500,1525,1537,1541,1583,1609,1613],{"__ignoreMap":700},[704,1473,1474,1476,1478,1481,1483,1485,1487,1489,1491,1494],{"class":706,"line":707},[704,1475,711],{"class":710},[704,1477,715],{"class":714},[704,1479,1480],{"class":718}," withEvlog",[704,1482,766],{"class":714},[704,1484,1161],{"class":718},[704,1486,722],{"class":714},[704,1488,725],{"class":710},[704,1490,728],{"class":714},[704,1492,1493],{"class":731},"@\u002Flib\u002Fevlog",[704,1495,735],{"class":714},[704,1497,1498],{"class":706,"line":738},[704,1499,742],{"emptyLinePlaceholder":741},[704,1501,1502,1504,1507,1510,1512,1514,1516,1518,1521,1523],{"class":706,"line":745},[704,1503,1180],{"class":710},[704,1505,1506],{"class":885}," const",[704,1508,1509],{"class":718}," POST ",[704,1511,892],{"class":714},[704,1513,1480],{"class":752},[704,1515,755],{"class":718},[704,1517,1191],{"class":885},[704,1519,1520],{"class":714}," ()",[704,1522,1203],{"class":885},[704,1524,1206],{"class":714},[704,1526,1527,1529,1531,1533,1535],{"class":706,"line":779},[704,1528,1211],{"class":885},[704,1530,719],{"class":718},[704,1532,1216],{"class":714},[704,1534,1161],{"class":752},[704,1536,984],{"class":794},[704,1538,1539],{"class":706,"line":974},[704,1540,742],{"emptyLinePlaceholder":741},[704,1542,1543,1545,1547,1549,1551,1553,1555,1557,1559,1561,1563,1565,1567,1569,1571,1573,1575,1577,1579,1581],{"class":706,"line":1231},[704,1544,1234],{"class":718},[704,1546,637],{"class":714},[704,1548,937],{"class":752},[704,1550,755],{"class":794},[704,1552,791],{"class":714},[704,1554,1072],{"class":794},[704,1556,798],{"class":714},[704,1558,715],{"class":714},[704,1560,1079],{"class":794},[704,1562,798],{"class":714},[704,1564,1084],{"class":829},[704,1566,766],{"class":714},[704,1568,1089],{"class":794},[704,1570,798],{"class":714},[704,1572,728],{"class":714},[704,1574,1096],{"class":731},[704,1576,758],{"class":714},[704,1578,722],{"class":714},[704,1580,722],{"class":714},[704,1582,776],{"class":794},[704,1584,1585,1587,1590,1592,1595,1597,1599,1601,1603,1605,1607],{"class":706,"line":1275},[704,1586,1278],{"class":710},[704,1588,1589],{"class":718}," Response",[704,1591,637],{"class":714},[704,1593,1594],{"class":752},"json",[704,1596,755],{"class":794},[704,1598,791],{"class":714},[704,1600,1283],{"class":794},[704,1602,798],{"class":714},[704,1604,1289],{"class":1288},[704,1606,722],{"class":714},[704,1608,776],{"class":794},[704,1610,1611],{"class":706,"line":1295},[704,1612,1299],{"class":1298},[704,1614,1615,1617],{"class":706,"line":1302},[704,1616,1305],{"class":714},[704,1618,776],{"class":718},[694,1620,1622],{"className":696,"code":1621,"filename":275,"language":699,"meta":698,"style":700},"app.post('\u002Fapi\u002Fcheckout', async (c) => {\n  const log = c.get('log')\n\n  log.set({ user: { id: 1, plan: 'pro' } })\n  return c.json({ success: true })\n  \u002F\u002F auto-emitted on response end\n})\n",[651,1623,1624,1658,1684,1688,1730,1754,1758],{"__ignoreMap":700},[704,1625,1626,1629,1631,1634,1636,1638,1640,1642,1644,1647,1649,1652,1654,1656],{"class":706,"line":707},[704,1627,1628],{"class":718},"app",[704,1630,637],{"class":714},[704,1632,1633],{"class":752},"post",[704,1635,755],{"class":718},[704,1637,758],{"class":714},[704,1639,1051],{"class":731},[704,1641,758],{"class":714},[704,1643,766],{"class":714},[704,1645,1646],{"class":885}," async",[704,1648,1194],{"class":714},[704,1650,1651],{"class":1197},"c",[704,1653,689],{"class":714},[704,1655,1203],{"class":885},[704,1657,1206],{"class":714},[704,1659,1660,1662,1664,1666,1669,1671,1674,1676,1678,1680,1682],{"class":706,"line":738},[704,1661,1211],{"class":885},[704,1663,719],{"class":718},[704,1665,1216],{"class":714},[704,1667,1668],{"class":718}," c",[704,1670,637],{"class":714},[704,1672,1673],{"class":752},"get",[704,1675,755],{"class":794},[704,1677,758],{"class":714},[704,1679,688],{"class":731},[704,1681,758],{"class":714},[704,1683,776],{"class":794},[704,1685,1686],{"class":706,"line":745},[704,1687,742],{"emptyLinePlaceholder":741},[704,1689,1690,1692,1694,1696,1698,1700,1702,1704,1706,1708,1710,1712,1714,1716,1718,1720,1722,1724,1726,1728],{"class":706,"line":779},[704,1691,1234],{"class":718},[704,1693,637],{"class":714},[704,1695,937],{"class":752},[704,1697,755],{"class":794},[704,1699,791],{"class":714},[704,1701,1072],{"class":794},[704,1703,798],{"class":714},[704,1705,715],{"class":714},[704,1707,1079],{"class":794},[704,1709,798],{"class":714},[704,1711,1084],{"class":829},[704,1713,766],{"class":714},[704,1715,1089],{"class":794},[704,1717,798],{"class":714},[704,1719,728],{"class":714},[704,1721,1096],{"class":731},[704,1723,758],{"class":714},[704,1725,722],{"class":714},[704,1727,722],{"class":714},[704,1729,776],{"class":794},[704,1731,1732,1734,1736,1738,1740,1742,1744,1746,1748,1750,1752],{"class":706,"line":974},[704,1733,1278],{"class":710},[704,1735,1668],{"class":718},[704,1737,637],{"class":714},[704,1739,1594],{"class":752},[704,1741,755],{"class":794},[704,1743,791],{"class":714},[704,1745,1283],{"class":794},[704,1747,798],{"class":714},[704,1749,1289],{"class":1288},[704,1751,722],{"class":714},[704,1753,776],{"class":794},[704,1755,1756],{"class":706,"line":1231},[704,1757,1299],{"class":1298},[704,1759,1760,1762],{"class":706,"line":1275},[704,1761,1305],{"class":714},[704,1763,776],{"class":718},[694,1765,1767],{"className":696,"code":1766,"filename":270,"language":699,"meta":698,"style":700},"app.post('\u002Fapi\u002Fcheckout', async (req, res) => {\n  const log = req.log\n\n  log.set({ user: { id: 1, plan: 'pro' } })\n  return res.json({ success: true })\n  \u002F\u002F auto-emitted on response end\n})\n",[651,1768,1769,1805,1821,1825,1867,1891,1895],{"__ignoreMap":700},[704,1770,1771,1773,1775,1777,1779,1781,1783,1785,1787,1789,1791,1794,1796,1799,1801,1803],{"class":706,"line":707},[704,1772,1628],{"class":718},[704,1774,637],{"class":714},[704,1776,1633],{"class":752},[704,1778,755],{"class":718},[704,1780,758],{"class":714},[704,1782,1051],{"class":731},[704,1784,758],{"class":714},[704,1786,766],{"class":714},[704,1788,1646],{"class":885},[704,1790,1194],{"class":714},[704,1792,1793],{"class":1197},"req",[704,1795,766],{"class":714},[704,1797,1798],{"class":1197}," res",[704,1800,689],{"class":714},[704,1802,1203],{"class":885},[704,1804,1206],{"class":714},[704,1806,1807,1809,1811,1813,1816,1818],{"class":706,"line":738},[704,1808,1211],{"class":885},[704,1810,719],{"class":718},[704,1812,1216],{"class":714},[704,1814,1815],{"class":718}," req",[704,1817,637],{"class":714},[704,1819,1820],{"class":718},"log\n",[704,1822,1823],{"class":706,"line":745},[704,1824,742],{"emptyLinePlaceholder":741},[704,1826,1827,1829,1831,1833,1835,1837,1839,1841,1843,1845,1847,1849,1851,1853,1855,1857,1859,1861,1863,1865],{"class":706,"line":779},[704,1828,1234],{"class":718},[704,1830,637],{"class":714},[704,1832,937],{"class":752},[704,1834,755],{"class":794},[704,1836,791],{"class":714},[704,1838,1072],{"class":794},[704,1840,798],{"class":714},[704,1842,715],{"class":714},[704,1844,1079],{"class":794},[704,1846,798],{"class":714},[704,1848,1084],{"class":829},[704,1850,766],{"class":714},[704,1852,1089],{"class":794},[704,1854,798],{"class":714},[704,1856,728],{"class":714},[704,1858,1096],{"class":731},[704,1860,758],{"class":714},[704,1862,722],{"class":714},[704,1864,722],{"class":714},[704,1866,776],{"class":794},[704,1868,1869,1871,1873,1875,1877,1879,1881,1883,1885,1887,1889],{"class":706,"line":974},[704,1870,1278],{"class":710},[704,1872,1798],{"class":718},[704,1874,637],{"class":714},[704,1876,1594],{"class":752},[704,1878,755],{"class":794},[704,1880,791],{"class":714},[704,1882,1283],{"class":794},[704,1884,798],{"class":714},[704,1886,1289],{"class":1288},[704,1888,722],{"class":714},[704,1890,776],{"class":794},[704,1892,1893],{"class":706,"line":1231},[704,1894,1299],{"class":1298},[704,1896,1897,1899],{"class":706,"line":1275},[704,1898,1305],{"class":714},[704,1900,776],{"class":718},[621,1902,1903,1905,1906,658,1909,658,1912,1915,1916,1918],{"color":623,"icon":13},[651,1904,1142],{}," 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 (",[651,1907,1908],{},"useLogger",[651,1910,1911],{},"req.log",[651,1913,1914],{},"c.get('log')",", etc.). In Nuxt, ",[651,1917,1908],{}," is auto-imported.",[639,1920,1922],{"id":1921},"choose-the-mode-for-the-job","Choose the mode for the job",[1924,1925,1926,1948],"table",{},[1927,1928,1929],"thead",{},[1930,1931,1932,1935,1939,1945],"tr",{},[1933,1934],"th",{},[1933,1936,1937],{},[651,1938,688],{},[1933,1940,1941,842,1943],{},[651,1942,841],{},[651,1944,845],{},[1933,1946,1947],{},"Framework middleware",[1949,1950,1951,1968,1988,2007,2022],"tbody",{},[1930,1952,1953,1959,1962,1965],{},[1954,1955,1956],"td",{},[613,1957,1958],{},"Use case",[1954,1960,1961],{},"Quick one-off events",[1954,1963,1964],{},"Scripts, jobs, workers, queues, HTTP without a framework",[1954,1966,1967],{},"API routes with a framework integration",[1930,1969,1970,1975,1978,1984],{},[1954,1971,1972],{},[613,1973,1974],{},"Context",[1954,1976,1977],{},"Single call",[1954,1979,1980,1981],{},"Accumulate with ",[651,1982,1983],{},"set()",[1954,1985,1980,1986],{},[651,1987,1983],{},[1930,1989,1990,1995,1998,2004],{},[1954,1991,1992],{},[613,1993,1994],{},"Emit",[1954,1996,1997],{},"Immediate",[1954,1999,2000,2001],{},"Manual ",[651,2002,2003],{},"emit()",[1954,2005,2006],{},"Automatic on response end",[1930,2008,2009,2013,2016,2019],{},[1954,2010,2011],{},[613,2012,61],{},[1954,2014,2015],{},"None",[1954,2017,2018],{},"You manage it",[1954,2020,2021],{},"Framework manages it",[1930,2023,2024,2029,2032,2034],{},[1954,2025,2026],{},[613,2027,2028],{},"Output",[1954,2030,2031],{},"Console + drain",[1954,2033,2031],{},[1954,2035,2036],{},"Console + drain + enrich",[682,2038,2040],{"id":2039},"by-context","By context",[1924,2042,2043,2055],{},[1927,2044,2045],{},[1930,2046,2047,2049,2052],{},[1933,2048,1974],{},[1933,2050,2051],{},"Best fit",[1933,2053,2054],{},"Why",[1949,2056,2057,2075,2090,2111,2132,2150,2174,2192,2208,2228,2243],{},[1930,2058,2059,2064,2072],{},[1954,2060,2061],{},[613,2062,2063],{},"HTTP route in Nuxt \u002F Next \u002F Hono \u002F Express \u002F …",[1954,2065,2066,2068,2069],{},[651,2067,1142],{}," via ",[631,2070,2071],{"href":236},"framework integration",[1954,2073,2074],{},"One wide event per request, auto-emitted on response end",[1930,2076,2077,2082,2087],{},[1954,2078,2079],{},[613,2080,2081],{},"HTTP handler without a framework",[1954,2083,2084],{},[651,2085,2086],{},"createRequestLogger({ method, path })",[1954,2088,2089],{},"Same shape as framework middleware, manual emit",[1930,2091,2092,2097,2108],{},[1954,2093,2094],{},[613,2095,2096],{},"CLI tool \u002F one-shot script",[1954,2098,2099,2102,2103,2105,2106],{},[651,2100,2101],{},"log.*"," for steps + ",[651,2104,841],{}," for the run summary — see ",[631,2107,300],{"href":301},[1954,2109,2110],{},"Pretty in dev, structured in CI, one summary event for the whole run",[1930,2112,2113,2118,2129],{},[1954,2114,2115],{},[613,2116,2117],{},"Published library",[1954,2119,2120,2122,2123,2126,2127],{},[651,2121,841],{}," only — never ",[651,2124,2125],{},"initLogger"," — see ",[631,2128,300],{"href":301},[1954,2130,2131],{},"Don't pollute the host app's global config or force a drain on consumers",[1930,2133,2134,2139,2147],{},[1954,2135,2136],{},[613,2137,2138],{},"Background job \u002F queue worker \u002F cron",[1954,2140,2141,2144,2145],{},[651,2142,2143],{},"createLogger({ jobId, queue })"," per invocation — see ",[631,2146,300],{"href":301},[1954,2148,2149],{},"One wide event per job run, perfect for retry analysis",[1930,2151,2152,2157,2167],{},[1954,2153,2154],{},[613,2155,2156],{},"Cloudflare Worker \u002F edge function",[1954,2158,2159,2162,2163,2126,2165],{},[651,2160,2161],{},"createWorkersLogger(req)"," or ",[651,2164,845],{},[631,2166,295],{"href":296},[1954,2168,2169,2170,2173],{},"Per-request event, no ",[651,2171,2172],{},"process"," globals required",[1930,2175,2176,2180,2189],{},[1954,2177,2178],{},[613,2179,314],{},[1954,2181,2182,2184,2185,2144,2187],{},[651,2183,2125],{}," once + ",[651,2186,841],{},[631,2188,314],{"href":315},[1954,2190,2191],{},"Cold-start init, per-event scope, drain flush in the handler",[1930,2193,2194,2199,2205],{},[1954,2195,2196],{},[613,2197,2198],{},"Batch \u002F pipeline step",[1954,2200,2201,2204],{},[651,2202,2203],{},"createLogger({ step })"," per stage",[1954,2206,2207],{},"One event per stage with inputs and outputs side by side",[1930,2209,2210,2215,2225],{},[1954,2211,2212],{},[613,2213,2214],{},"AI agent \u002F LLM call",[1954,2216,2217,2219,2220],{},[651,2218,841],{}," + ",[631,2221,2222],{"href":338},[651,2223,2224],{},"createAILogger",[1954,2226,2227],{},"Token usage, tool calls, streaming metrics on the same wide event",[1930,2229,2230,2235,2240],{},[1954,2231,2232],{},[613,2233,2234],{},"Library function called inside a request",[1954,2236,2237,2239],{},[651,2238,1142],{}," from caller, or accept a logger as argument",[1954,2241,2242],{},"Inherit the parent's request context, contribute to the same wide event",[1930,2244,2245,2250,2255],{},[1954,2246,2247],{},[613,2248,2249],{},"Shared workspace package",[1954,2251,2252,2253],{},"Treat it like a library — see ",[631,2254,300],{"href":301},[1954,2256,2257,2258,2260,2261,2263],{},"Host app owns ",[651,2259,2125],{}," \u002F drain; packages use ",[651,2262,841],{}," or accept a logger",[621,2265,2266,2267,634,2269,2271],{"color":623,"icon":478},"None of these is an \"upgrade\" of another. Use ",[651,2268,688],{},[651,2270,841],{}," in the same file when it makes sense, since they share the global drain, redaction, and types.",[639,2273,2275],{"id":2274},"what-all-three-share","What all three share",[609,2277,2278],{},"All three modes share the same foundation:",[2280,2281,2282,2293,2301,2323,2328,2334],"ul",{},[2283,2284,2285,2288,2289,2292],"li",{},[613,2286,2287],{},"Pretty output"," in development, ",[613,2290,2291],{},"JSON"," in production (default, no configuration needed)",[2283,2294,2295,2297,2298],{},[613,2296,534],{}," to send events to Axiom, Sentry, PostHog, and more. See ",[631,2299,2300],{"href":153},"Integrate \u002F Adapters",[2283,2302,2303,2306,2307,658,2310,1129,2313,2316,2317,2322],{},[613,2304,2305],{},"Structured errors"," with ",[651,2308,2309],{},"why",[651,2311,2312],{},"fix",[651,2314,2315],{},"link",", plus optional backend-only ",[613,2318,2319],{},[651,2320,2321],{},"internal"," for logs",[2283,2324,2325,2327],{},[613,2326,66],{}," (head + tail) to control log volume in production",[2283,2329,2330,2333],{},[613,2331,2332],{},"Redaction"," that wipes secrets before they ever leave the process",[2283,2335,2336,2339],{},[613,2337,2338],{},"Zero dependencies",", ~6 kB gzip",[639,2341,2343],{"id":2342},"where-to-go-from-here","Where to go from here",[609,2345,2346],{},"After the three modes, the rest of Learn covers the concepts that show up across every mode:",[2280,2348,2349,2370,2375,2383,2388,2401],{},[2283,2350,2351,2353,2354,658,2356,658,2358,658,2360,2362,2363,2366,2367],{},[631,2352,56],{"href":57},": ",[651,2355,2309],{},[651,2357,2312],{},[651,2359,2315],{},[651,2361,2321],{},", and how ",[651,2364,2365],{},"createError"," differs from ",[651,2368,2369],{},"throw new Error",[2283,2371,2372,2374],{},[631,2373,81],{"href":82},": typed error \u002F audit catalogs that survive refactors",[2283,2376,2377,2379,2380,2382],{},[631,2378,61],{"href":62},": exactly what happens between ",[651,2381,2003],{}," and your drain",[2283,2384,2385,2387],{},[631,2386,66],{"href":67},": keep all errors and slow requests; drop healthy noise",[2283,2389,2390,2392,2393,2396,2397,2400],{},[631,2391,76],{"href":77},": augment ",[651,2394,2395],{},"RequestLogger"," so ",[651,2398,2399],{},"log.set"," is autocompleted",[2283,2402,2403,2405,2406,658,2409,658,2412,2415],{},[631,2404,2332],{"href":72},": the rules that strip ",[651,2407,2408],{},"authorization",[651,2410,2411],{},"password",[651,2413,2414],{},"token",", etc. before drain",[609,2417,2418,2419,2421,2422,2427],{},"When you're done with Learn, head to ",[631,2420,139],{"href":236}," to wire evlog into your stack, or run ",[631,2423,2424],{"href":100},[651,2425,2426],{},"evlog map"," first to find missing evlog patterns in supported entry points.",[2429,2430,2431],"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":700,"searchDepth":738,"depth":738,"links":2433},[2434,2435,2442,2445,2446],{"id":641,"depth":738,"text":642},{"id":679,"depth":738,"text":680,"children":2436},[2437,2439,2441],{"id":684,"depth":745,"text":2438},"Simple Logging (log)",{"id":837,"depth":745,"text":2440},"Wide Events (createLogger \u002F createRequestLogger)",{"id":1135,"depth":745,"text":1136},{"id":1921,"depth":738,"text":1922,"children":2443},[2444],{"id":2039,"depth":745,"text":2040},{"id":2274,"depth":738,"text":2275},{"id":2342,"depth":738,"text":2343},"The mental model: three logging modes, the wide event lifecycle, sampling, typed fields, and redaction. Read it in order if you are new.","md",[2450,2452,2453],{"label":46,"icon":49,"to":47,"color":627,"variant":2451},"subtle",{"label":51,"icon":54,"to":52,"color":627,"variant":2451},{"label":61,"icon":64,"to":62,"color":627,"variant":2451},{},{"title":41,"icon":44},{"title":604,"description":2447},"JBSSEYSSjdAKnMBxsvyzmAX02TCMSR5CGPyeZ0XFX14",[2459,2461],{"title":30,"path":31,"stem":32,"description":2460,"icon":33,"children":-1},"Choose a TypeScript logging library around the way you debug. See where evlog fits, what to keep from your current setup, and how to try it.",{"title":46,"path":47,"stem":48,"description":2462,"icon":49,"children":-1},"Use evlog for individual structured messages, with the same drains and redaction as wide events, and adapt existing logger call sites.",1791059985156]