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The ",[615,616,25],"a",{"href":26}," gets you going; the ",[615,619,620],{"href":47},"migration examples"," show how to bring familiar logging patterns to evlog.",[604,623,624,625,631,632,637,638,641],{},"Inspired by ",[615,626,630],{"href":627,"rel":628},"https:\u002F\u002Floggingsucks.com\u002F",[629],"nofollow","Logging Sucks"," by ",[615,633,636],{"href":634,"rel":635},"https:\u002F\u002Fx.com\u002Fboristane",[629],"Boris Tane",". The separate ",[615,639,640],{"href":91},"evlog CLI"," helps you explore your logs and spot missing logging patterns with static checks.",[643,644,646],"h2",{"id":645},"philosophy","Philosophy",[604,648,649],{},"Traditional logging is broken. Your logs are scattered across dozens of files. Each request generates 10+ log lines. When something goes wrong, you're left grep-ing through noise hoping to find signal.",[604,651,652,654],{},[607,653,609],{}," takes a different approach:",[656,657,658,668,671,674],"card-group",{},[659,660,662,663,667],"card",{"icon":49,"title":661},"Structured Logging","Replace ",[664,665,666],"code",{},"console.log"," with typed, structured events that flow through a drain pipeline. Same level filtering, redaction, and pretty\u002FJSON output as pino or consola.",[659,669,670],{"icon":54,"title":51},"Accumulate context over any unit of work (a request, script, or job) and emit once. The two modes coexist, and neither is an upgrade of the other.",[659,672,673],{"icon":59,"title":56},"Errors that explain why they occurred and how to fix them.",[659,675,678],{"icon":676,"title":677},"i-lucide-palette","Pretty for Dev","Human-readable in development, machine-parseable JSON in production.",[680,681,684,685,688,689,691],"callout",{"color":682,"icon":683},"info","i-lucide-globe","Not running an HTTP framework? See ",[615,686,687],{"href":301},"Standalone TypeScript"," for scripts, workers, and CLIs, and ",[615,690,295],{"href":296}," for the edge runtime.",[643,693,695],{"id":694},"why-evlog-over-pino-winston-or-consola","Why evlog over pino, winston, or consola",[604,697,698],{},"evlog is a fully-featured general-purpose logger that happens to also do wide events. Concretely:",[700,701,702,712,730,747],"ul",{},[703,704,705,708,709,711],"li",{},[607,706,707],{},"Zero runtime dependencies in the core package."," Start with the logger and add integrations as you need them. See ",[615,710,383],{"href":548}," for bundle sizes and benchmarks.",[703,713,714,717,718,721,722,725,726,729],{},[607,715,716],{},"Same API in every context",": scripts, frameworks, edge runtimes, browser, library code. No ",[664,719,720],{},"pino-http"," vs ",[664,723,724],{},"pino"," split, no separate ",[664,727,728],{},"consola"," reporters per environment.",[703,731,732,746],{},[607,733,734,735,738,739,738,742,745],{},"Structured errors with ",[664,736,737],{},"why"," \u002F ",[664,740,741],{},"fix",[664,743,744],{},"link"," built in",": your error toast finally tells users what went wrong and what to do, your on-call stops reverse-engineering stack traces.",[703,748,749,752,753,756,757,760],{},[607,750,751],{},"Wide events as a free upgrade path",": when you need to correlate context across an operation, the same logger gives you ",[664,754,755],{},"log.set"," + ",[664,758,759],{},"log.emit"," instead of stitching log lines together later.",[604,762,763,764,767],{},"See the full ",[615,765,766],{"href":561},"feature comparison"," (parity matrix, honest gaps, and migration snippets) for a side-by-side with pino, winston, and consola.",[643,769,771],{"id":770},"pick-one-of-three-ways-to-log","Pick one of three ways to log",[604,773,774],{},"evlog provides three APIs for different contexts. You can use all three in the same project.",[776,777,46],"h3",{"id":778},"simple-logging",[604,780,781,782,784],{},"Fire-and-forget structured logs. Replace ",[664,783,666],{},", consola, or pino:",[786,787,793],"pre",{"className":788,"code":789,"filename":790,"language":791,"meta":792,"style":792},"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","",[664,794,795,827,834,870],{"__ignoreMap":792},[796,797,800,804,808,812,815,818,821,824],"span",{"class":798,"line":799},"line",1,[796,801,803],{"class":802},"s7zQu","import",[796,805,807],{"class":806},"sMK4o"," {",[796,809,811],{"class":810},"sTEyZ"," log",[796,813,814],{"class":806}," }",[796,816,817],{"class":802}," from",[796,819,820],{"class":806}," '",[796,822,609],{"class":823},"sfazB",[796,825,826],{"class":806},"'\n",[796,828,830],{"class":798,"line":829},2,[796,831,833],{"emptyLinePlaceholder":832},true,"\n",[796,835,837,840,843,846,849,852,855,857,860,862,865,867],{"class":798,"line":836},3,[796,838,839],{"class":810},"log",[796,841,842],{"class":806},".",[796,844,682],{"class":845},"s2Zo4",[796,847,848],{"class":810},"(",[796,850,851],{"class":806},"'",[796,853,854],{"class":823},"auth",[796,856,851],{"class":806},[796,858,859],{"class":806},",",[796,861,820],{"class":806},[796,863,864],{"class":823},"User logged in",[796,866,851],{"class":806},[796,868,869],{"class":810},")\n",[796,871,873,875,877,880,882,885,889,892,894,897,899,901,904,906,908,911,913,915,918,920,924,926],{"class":798,"line":872},4,[796,874,839],{"class":810},[796,876,842],{"class":806},[796,878,879],{"class":845},"error",[796,881,848],{"class":810},[796,883,884],{"class":806},"{",[796,886,888],{"class":887},"swJcz"," action",[796,890,891],{"class":806},":",[796,893,820],{"class":806},[796,895,896],{"class":823},"payment",[796,898,851],{"class":806},[796,900,859],{"class":806},[796,902,903],{"class":887}," error",[796,905,891],{"class":806},[796,907,820],{"class":806},[796,909,910],{"class":823},"card_declined",[796,912,851],{"class":806},[796,914,859],{"class":806},[796,916,917],{"class":887}," userId",[796,919,891],{"class":806},[796,921,923],{"class":922},"sbssI"," 42",[796,925,814],{"class":806},[796,927,869],{"class":810},[776,929,51],{"id":930},"wide-events",[604,932,933],{},"Accumulate context progressively over any operation, then emit a single comprehensive event:",[935,936,937,1070,1200],"code-group",{},[786,938,941],{"className":788,"code":939,"filename":940,"language":791,"meta":792,"style":792},"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",[664,942,943,962,966,1014,1057],{"__ignoreMap":792},[796,944,945,947,949,952,954,956,958,960],{"class":798,"line":799},[796,946,803],{"class":802},[796,948,807],{"class":806},[796,950,951],{"class":810}," createLogger",[796,953,814],{"class":806},[796,955,817],{"class":802},[796,957,820],{"class":806},[796,959,609],{"class":823},[796,961,826],{"class":806},[796,963,964],{"class":798,"line":829},[796,965,833],{"emptyLinePlaceholder":832},[796,967,968,972,975,978,980,982,984,987,989,991,994,996,998,1001,1003,1005,1008,1010,1012],{"class":798,"line":836},[796,969,971],{"class":970},"spNyl","const",[796,973,974],{"class":810}," log ",[796,976,977],{"class":806},"=",[796,979,951],{"class":845},[796,981,848],{"class":810},[796,983,884],{"class":806},[796,985,986],{"class":887}," jobId",[796,988,891],{"class":806},[796,990,820],{"class":806},[796,992,993],{"class":823},"sync-001",[796,995,851],{"class":806},[796,997,859],{"class":806},[796,999,1000],{"class":887}," queue",[796,1002,891],{"class":806},[796,1004,820],{"class":806},[796,1006,1007],{"class":823},"emails",[796,1009,851],{"class":806},[796,1011,814],{"class":806},[796,1013,869],{"class":810},[796,1015,1016,1018,1020,1023,1025,1027,1030,1032,1034,1037,1039,1042,1044,1047,1049,1051,1053,1055],{"class":798,"line":872},[796,1017,839],{"class":810},[796,1019,842],{"class":806},[796,1021,1022],{"class":845},"set",[796,1024,848],{"class":810},[796,1026,884],{"class":806},[796,1028,1029],{"class":887}," batch",[796,1031,891],{"class":806},[796,1033,807],{"class":806},[796,1035,1036],{"class":887}," size",[796,1038,891],{"class":806},[796,1040,1041],{"class":922}," 50",[796,1043,859],{"class":806},[796,1045,1046],{"class":887}," processed",[796,1048,891],{"class":806},[796,1050,1041],{"class":922},[796,1052,814],{"class":806},[796,1054,814],{"class":806},[796,1056,869],{"class":810},[796,1058,1060,1062,1064,1067],{"class":798,"line":1059},5,[796,1061,839],{"class":810},[796,1063,842],{"class":806},[796,1065,1066],{"class":845},"emit",[796,1068,1069],{"class":810},"()\n",[786,1071,1074],{"className":788,"code":1072,"filename":1073,"language":791,"meta":792,"style":792},"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",[664,1075,1076,1095,1099,1143,1190],{"__ignoreMap":792},[796,1077,1078,1080,1082,1085,1087,1089,1091,1093],{"class":798,"line":799},[796,1079,803],{"class":802},[796,1081,807],{"class":806},[796,1083,1084],{"class":810}," createRequestLogger",[796,1086,814],{"class":806},[796,1088,817],{"class":802},[796,1090,820],{"class":806},[796,1092,609],{"class":823},[796,1094,826],{"class":806},[796,1096,1097],{"class":798,"line":829},[796,1098,833],{"emptyLinePlaceholder":832},[796,1100,1101,1103,1105,1107,1109,1111,1113,1116,1118,1120,1123,1125,1127,1130,1132,1134,1137,1139,1141],{"class":798,"line":836},[796,1102,971],{"class":970},[796,1104,974],{"class":810},[796,1106,977],{"class":806},[796,1108,1084],{"class":845},[796,1110,848],{"class":810},[796,1112,884],{"class":806},[796,1114,1115],{"class":887}," method",[796,1117,891],{"class":806},[796,1119,820],{"class":806},[796,1121,1122],{"class":823},"POST",[796,1124,851],{"class":806},[796,1126,859],{"class":806},[796,1128,1129],{"class":887}," path",[796,1131,891],{"class":806},[796,1133,820],{"class":806},[796,1135,1136],{"class":823},"\u002Fapi\u002Fcheckout",[796,1138,851],{"class":806},[796,1140,814],{"class":806},[796,1142,869],{"class":810},[796,1144,1145,1147,1149,1151,1153,1155,1158,1160,1162,1165,1167,1170,1172,1175,1177,1179,1182,1184,1186,1188],{"class":798,"line":872},[796,1146,839],{"class":810},[796,1148,842],{"class":806},[796,1150,1022],{"class":845},[796,1152,848],{"class":810},[796,1154,884],{"class":806},[796,1156,1157],{"class":887}," user",[796,1159,891],{"class":806},[796,1161,807],{"class":806},[796,1163,1164],{"class":887}," id",[796,1166,891],{"class":806},[796,1168,1169],{"class":922}," 1",[796,1171,859],{"class":806},[796,1173,1174],{"class":887}," plan",[796,1176,891],{"class":806},[796,1178,820],{"class":806},[796,1180,1181],{"class":823},"pro",[796,1183,851],{"class":806},[796,1185,814],{"class":806},[796,1187,814],{"class":806},[796,1189,869],{"class":810},[796,1191,1192,1194,1196,1198],{"class":798,"line":1059},[796,1193,839],{"class":810},[796,1195,842],{"class":806},[796,1197,1066],{"class":845},[796,1199,1069],{"class":810},[786,1201,1204],{"className":788,"code":1202,"filename":1203,"language":791,"meta":792,"style":792},"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",[664,1205,1206,1225,1229,1261,1279,1322,1342,1349],{"__ignoreMap":792},[796,1207,1208,1210,1212,1215,1217,1219,1221,1223],{"class":798,"line":799},[796,1209,803],{"class":802},[796,1211,807],{"class":806},[796,1213,1214],{"class":810}," useLogger",[796,1216,814],{"class":806},[796,1218,817],{"class":802},[796,1220,820],{"class":806},[796,1222,609],{"class":823},[796,1224,826],{"class":806},[796,1226,1227],{"class":798,"line":829},[796,1228,833],{"emptyLinePlaceholder":832},[796,1230,1231,1234,1237,1240,1242,1245,1248,1252,1255,1258],{"class":798,"line":836},[796,1232,1233],{"class":802},"export",[796,1235,1236],{"class":802}," default",[796,1238,1239],{"class":845}," defineEventHandler",[796,1241,848],{"class":810},[796,1243,1244],{"class":970},"async",[796,1246,1247],{"class":806}," (",[796,1249,1251],{"class":1250},"sHdIc","event",[796,1253,1254],{"class":806},")",[796,1256,1257],{"class":970}," =>",[796,1259,1260],{"class":806}," {\n",[796,1262,1263,1266,1268,1271,1273,1275,1277],{"class":798,"line":872},[796,1264,1265],{"class":970},"  const",[796,1267,811],{"class":810},[796,1269,1270],{"class":806}," =",[796,1272,1214],{"class":845},[796,1274,848],{"class":887},[796,1276,1251],{"class":810},[796,1278,869],{"class":887},[796,1280,1281,1284,1286,1288,1290,1292,1294,1296,1298,1300,1302,1304,1306,1308,1310,1312,1314,1316,1318,1320],{"class":798,"line":1059},[796,1282,1283],{"class":810},"  log",[796,1285,842],{"class":806},[796,1287,1022],{"class":845},[796,1289,848],{"class":887},[796,1291,884],{"class":806},[796,1293,1157],{"class":887},[796,1295,891],{"class":806},[796,1297,807],{"class":806},[796,1299,1164],{"class":887},[796,1301,891],{"class":806},[796,1303,1169],{"class":922},[796,1305,859],{"class":806},[796,1307,1174],{"class":887},[796,1309,891],{"class":806},[796,1311,820],{"class":806},[796,1313,1181],{"class":823},[796,1315,851],{"class":806},[796,1317,814],{"class":806},[796,1319,814],{"class":806},[796,1321,869],{"class":887},[796,1323,1325,1328,1330,1333,1335,1339],{"class":798,"line":1324},6,[796,1326,1327],{"class":802},"  return",[796,1329,807],{"class":806},[796,1331,1332],{"class":887}," success",[796,1334,891],{"class":806},[796,1336,1338],{"class":1337},"sfNiH"," true",[796,1340,1341],{"class":806}," }\n",[796,1343,1345],{"class":798,"line":1344},7,[796,1346,1348],{"class":1347},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[796,1350,1352,1355],{"class":798,"line":1351},8,[796,1353,1354],{"class":806},"}",[796,1356,869],{"class":810},[604,1358,1359],{},"One log, all context. Everything you need to understand what happened.",[776,1361,56],{"id":1362},"structured-errors",[604,1364,1365,1366,1368,1369,1371,1372,1374],{},"Errors with actionable context: ",[664,1367,737],{}," it happened, how to ",[664,1370,741],{}," it, and a ",[664,1373,744],{}," to docs:",[935,1376,1377,1501],{},[786,1378,1380],{"className":788,"code":1379,"filename":1203,"language":791,"meta":792,"style":792},"import { createError } from 'evlog'\n\nthrow createError({\n  message: 'Payment failed',\n  status: 402,\n  why: 'Card declined by issuer (insufficient funds)',\n  fix: 'Try a different payment method or contact your bank',\n  link: 'https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined',\n})\n",[664,1381,1382,1401,1405,1417,1434,1446,1462,1478,1494],{"__ignoreMap":792},[796,1383,1384,1386,1388,1391,1393,1395,1397,1399],{"class":798,"line":799},[796,1385,803],{"class":802},[796,1387,807],{"class":806},[796,1389,1390],{"class":810}," createError",[796,1392,814],{"class":806},[796,1394,817],{"class":802},[796,1396,820],{"class":806},[796,1398,609],{"class":823},[796,1400,826],{"class":806},[796,1402,1403],{"class":798,"line":829},[796,1404,833],{"emptyLinePlaceholder":832},[796,1406,1407,1410,1412,1414],{"class":798,"line":836},[796,1408,1409],{"class":802},"throw",[796,1411,1390],{"class":845},[796,1413,848],{"class":810},[796,1415,1416],{"class":806},"{\n",[796,1418,1419,1422,1424,1426,1429,1431],{"class":798,"line":872},[796,1420,1421],{"class":887},"  message",[796,1423,891],{"class":806},[796,1425,820],{"class":806},[796,1427,1428],{"class":823},"Payment failed",[796,1430,851],{"class":806},[796,1432,1433],{"class":806},",\n",[796,1435,1436,1439,1441,1444],{"class":798,"line":1059},[796,1437,1438],{"class":887},"  status",[796,1440,891],{"class":806},[796,1442,1443],{"class":922}," 402",[796,1445,1433],{"class":806},[796,1447,1448,1451,1453,1455,1458,1460],{"class":798,"line":1324},[796,1449,1450],{"class":887},"  why",[796,1452,891],{"class":806},[796,1454,820],{"class":806},[796,1456,1457],{"class":823},"Card declined by issuer (insufficient funds)",[796,1459,851],{"class":806},[796,1461,1433],{"class":806},[796,1463,1464,1467,1469,1471,1474,1476],{"class":798,"line":1344},[796,1465,1466],{"class":887},"  fix",[796,1468,891],{"class":806},[796,1470,820],{"class":806},[796,1472,1473],{"class":823},"Try a different payment method or contact your bank",[796,1475,851],{"class":806},[796,1477,1433],{"class":806},[796,1479,1480,1483,1485,1487,1490,1492],{"class":798,"line":1351},[796,1481,1482],{"class":887},"  link",[796,1484,891],{"class":806},[796,1486,820],{"class":806},[796,1488,1489],{"class":823},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[796,1491,851],{"class":806},[796,1493,1433],{"class":806},[796,1495,1497,1499],{"class":798,"line":1496},9,[796,1498,1354],{"class":806},[796,1500,869],{"class":810},[786,1502,1507],{"className":1503,"code":1504,"filename":1505,"language":1506,"meta":792,"style":792},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{\n  \"statusCode\": 402,\n  \"message\": \"Payment failed\",\n  \"data\": {\n    \"why\": \"Card declined by issuer (insufficient funds)\",\n    \"fix\": \"Try a different payment method or contact your bank\",\n    \"link\": \"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined\"\n  }\n}\n","Response","json",[664,1508,1509,1513,1530,1550,1563,1583,1601,1618,1623],{"__ignoreMap":792},[796,1510,1511],{"class":798,"line":799},[796,1512,1416],{"class":806},[796,1514,1515,1518,1521,1524,1526,1528],{"class":798,"line":829},[796,1516,1517],{"class":806},"  \"",[796,1519,1520],{"class":970},"statusCode",[796,1522,1523],{"class":806},"\"",[796,1525,891],{"class":806},[796,1527,1443],{"class":922},[796,1529,1433],{"class":806},[796,1531,1532,1534,1537,1539,1541,1544,1546,1548],{"class":798,"line":836},[796,1533,1517],{"class":806},[796,1535,1536],{"class":970},"message",[796,1538,1523],{"class":806},[796,1540,891],{"class":806},[796,1542,1543],{"class":806}," \"",[796,1545,1428],{"class":823},[796,1547,1523],{"class":806},[796,1549,1433],{"class":806},[796,1551,1552,1554,1557,1559,1561],{"class":798,"line":872},[796,1553,1517],{"class":806},[796,1555,1556],{"class":970},"data",[796,1558,1523],{"class":806},[796,1560,891],{"class":806},[796,1562,1260],{"class":806},[796,1564,1565,1568,1571,1573,1575,1577,1579,1581],{"class":798,"line":1059},[796,1566,1567],{"class":806},"    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Pick evlog on day zero and the rest of the system inherits it.",1789076899655]