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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":10,"body":604,"description":2334,"extension":2335,"links":2336,"meta":2345,"navigation":2346,"path":11,"seo":2347,"stem":12,"__hash__":2348},"docs\u002F1.start\u002F1.introduction.md",{"type":605,"value":606,"toc":2323},"minimark",[607,615,626,646,651,654,659,683,696,700,703,765,772,776,779,783,789,932,935,938,1204,1207,1965,1968,1971,1983,2235,2239,2246,2269,2279,2283,2319],[608,609,610,614],"p",{},[611,612,613],"strong",{},"evlog"," is a TypeScript logging library that helps you understand what happened in your app. Start with structured logs, bring a request’s context together in one wide event, and turn failures into errors that explain what went wrong and how to fix it.",[608,616,617,618,621,622,625],{},"Use it in your next project or introduce it alongside your existing logger. The ",[619,620,25],"a",{"href":26}," gets you going; the ",[619,623,624],{"href":47},"migration examples"," show how to bring familiar logging patterns to evlog.",[608,627,628,629,635,636,641,642,645],{},"Inspired by ",[619,630,634],{"href":631,"rel":632},"https:\u002F\u002Floggingsucks.com\u002F",[633],"nofollow","Logging Sucks"," by ",[619,637,640],{"href":638,"rel":639},"https:\u002F\u002Fx.com\u002Fboristane",[633],"Boris Tane",". The separate ",[619,643,644],{"href":91},"evlog CLI"," helps you explore your logs and spot missing logging patterns with static checks.",[647,648,650],"h2",{"id":649},"philosophy","Philosophy",[608,652,653],{},"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.",[608,655,656,658],{},[611,657,613],{}," takes a different approach:",[660,661,662,672,675,678],"card-group",{},[663,664,666,667,671],"card",{"icon":49,"title":665},"Structured Logging","Replace ",[668,669,670],"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.",[663,673,674],{"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.",[663,676,677],{"icon":59,"title":56},"Errors that explain why they occurred and how to fix them.",[663,679,682],{"icon":680,"title":681},"i-lucide-palette","Pretty for Dev","Human-readable in development, machine-parseable JSON in production.",[684,685,688,689,692,693,695],"callout",{"color":686,"icon":687},"info","i-lucide-globe","Not running an HTTP framework? See ",[619,690,691],{"href":301},"Standalone TypeScript"," for scripts, workers, and CLIs, and ",[619,694,295],{"href":296}," for the edge runtime.",[647,697,699],{"id":698},"why-evlog-over-pino-winston-or-consola","Why evlog over pino, winston, or consola",[608,701,702],{},"evlog is a fully-featured general-purpose logger that happens to also do wide events. Concretely:",[704,705,706,716,734,751],"ul",{},[707,708,709,712,713,715],"li",{},[611,710,711],{},"Zero runtime dependencies in the core package."," Start with the logger and add integrations as you need them. See ",[619,714,383],{"href":552}," for bundle sizes and benchmarks.",[707,717,718,721,722,725,726,729,730,733],{},[611,719,720],{},"Same API in every context",": scripts, frameworks, edge runtimes, browser, library code. No ",[668,723,724],{},"pino-http"," vs ",[668,727,728],{},"pino"," split, no separate ",[668,731,732],{},"consola"," reporters per environment.",[707,735,736,750],{},[611,737,738,739,742,743,742,746,749],{},"Structured errors with ",[668,740,741],{},"why"," \u002F ",[668,744,745],{},"fix",[668,747,748],{},"link"," built in",": your error toast finally tells users what went wrong and what to do, your on-call stops reverse-engineering stack traces.",[707,752,753,756,757,760,761,764],{},[611,754,755],{},"Wide events as a free upgrade path",": when you need to correlate context across an operation, the same logger gives you ",[668,758,759],{},"log.set"," + ",[668,762,763],{},"log.emit"," instead of stitching log lines together later.",[608,766,767,768,771],{},"See the full ",[619,769,770],{"href":565},"feature comparison"," (parity matrix, honest gaps, and migration snippets) for a side-by-side with pino, winston, and consola.",[647,773,775],{"id":774},"pick-one-of-three-ways-to-log","Pick one of three ways to log",[608,777,778],{},"evlog provides three APIs for different contexts. You can use all three in the same project.",[780,781,46],"h3",{"id":782},"simple-logging",[608,784,785,786,788],{},"Fire-and-forget structured logs. Replace ",[668,787,670],{},", consola, or pino:",[790,791,797],"pre",{"className":792,"code":793,"filename":794,"language":795,"meta":796,"style":796},"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","",[668,798,799,831,838,874],{"__ignoreMap":796},[800,801,804,808,812,816,819,822,825,828],"span",{"class":802,"line":803},"line",1,[800,805,807],{"class":806},"s7zQu","import",[800,809,811],{"class":810},"sMK4o"," {",[800,813,815],{"class":814},"sTEyZ"," log",[800,817,818],{"class":810}," }",[800,820,821],{"class":806}," from",[800,823,824],{"class":810}," '",[800,826,613],{"class":827},"sfazB",[800,829,830],{"class":810},"'\n",[800,832,834],{"class":802,"line":833},2,[800,835,837],{"emptyLinePlaceholder":836},true,"\n",[800,839,841,844,847,850,853,856,859,861,864,866,869,871],{"class":802,"line":840},3,[800,842,843],{"class":814},"log",[800,845,846],{"class":810},".",[800,848,686],{"class":849},"s2Zo4",[800,851,852],{"class":814},"(",[800,854,855],{"class":810},"'",[800,857,858],{"class":827},"auth",[800,860,855],{"class":810},[800,862,863],{"class":810},",",[800,865,824],{"class":810},[800,867,868],{"class":827},"User logged in",[800,870,855],{"class":810},[800,872,873],{"class":814},")\n",[800,875,877,879,881,884,886,889,893,896,898,901,903,905,908,910,912,915,917,919,922,924,928,930],{"class":802,"line":876},4,[800,878,843],{"class":814},[800,880,846],{"class":810},[800,882,883],{"class":849},"error",[800,885,852],{"class":814},[800,887,888],{"class":810},"{",[800,890,892],{"class":891},"swJcz"," action",[800,894,895],{"class":810},":",[800,897,824],{"class":810},[800,899,900],{"class":827},"payment",[800,902,855],{"class":810},[800,904,863],{"class":810},[800,906,907],{"class":891}," error",[800,909,895],{"class":810},[800,911,824],{"class":810},[800,913,914],{"class":827},"card_declined",[800,916,855],{"class":810},[800,918,863],{"class":810},[800,920,921],{"class":891}," userId",[800,923,895],{"class":810},[800,925,927],{"class":926},"sbssI"," 42",[800,929,818],{"class":810},[800,931,873],{"class":814},[780,933,51],{"id":934},"wide-events",[608,936,937],{},"Accumulate context progressively over any operation, then emit a single comprehensive event:",[939,940,941,1074],"code-group",{},[790,942,945],{"className":792,"code":943,"filename":944,"language":795,"meta":796,"style":796},"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",[668,946,947,966,970,1018,1061],{"__ignoreMap":796},[800,948,949,951,953,956,958,960,962,964],{"class":802,"line":803},[800,950,807],{"class":806},[800,952,811],{"class":810},[800,954,955],{"class":814}," createLogger",[800,957,818],{"class":810},[800,959,821],{"class":806},[800,961,824],{"class":810},[800,963,613],{"class":827},[800,965,830],{"class":810},[800,967,968],{"class":802,"line":833},[800,969,837],{"emptyLinePlaceholder":836},[800,971,972,976,979,982,984,986,988,991,993,995,998,1000,1002,1005,1007,1009,1012,1014,1016],{"class":802,"line":840},[800,973,975],{"class":974},"spNyl","const",[800,977,978],{"class":814}," log ",[800,980,981],{"class":810},"=",[800,983,955],{"class":849},[800,985,852],{"class":814},[800,987,888],{"class":810},[800,989,990],{"class":891}," 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createRequestLogger",[800,1090,818],{"class":810},[800,1092,821],{"class":806},[800,1094,824],{"class":810},[800,1096,613],{"class":827},[800,1098,830],{"class":810},[800,1100,1101],{"class":802,"line":833},[800,1102,837],{"emptyLinePlaceholder":836},[800,1104,1105,1107,1109,1111,1113,1115,1117,1120,1122,1124,1127,1129,1131,1134,1136,1138,1141,1143,1145],{"class":802,"line":840},[800,1106,975],{"class":974},[800,1108,978],{"class":814},[800,1110,981],{"class":810},[800,1112,1088],{"class":849},[800,1114,852],{"class":814},[800,1116,888],{"class":810},[800,1118,1119],{"class":891}," method",[800,1121,895],{"class":810},[800,1123,824],{"class":810},[800,1125,1126],{"class":827},"POST",[800,1128,855],{"class":810},[800,1130,863],{"class":810},[800,1132,1133],{"class":891}," path",[800,1135,895],{"class":810},[800,1137,824],{"class":810},[800,1139,1140],{"class":827},"\u002Fapi\u002Fcheckout",[800,1142,855],{"class":810},[800,1144,818],{"class":810},[800,1146,873],{"class":814},[800,1148,1149,1151,1153,1155,1157,1159,1162,1164,1166,1169,1171,1174,1176,1179,1181,1183,1186,1188,1190,1192],{"class":802,"line":876},[800,1150,843],{"class":814},[800,1152,846],{"class":810},[800,1154,1026],{"class":849},[800,1156,852],{"class":814},[800,1158,888],{"class":810},[800,1160,1161],{"class":891}," user",[800,1163,895],{"class":810},[800,1165,811],{"class":810},[800,1167,1168],{"class":891}," id",[800,1170,895],{"class":810},[800,1172,1173],{"class":926}," 1",[800,1175,863],{"class":810},[800,1177,1178],{"class":891}," plan",[800,1180,895],{"class":810},[800,1182,824],{"class":810},[800,1184,1185],{"class":827},"pro",[800,1187,855],{"class":810},[800,1189,818],{"class":810},[800,1191,818],{"class":810},[800,1193,873],{"class":814},[800,1195,1196,1198,1200,1202],{"class":802,"line":1063},[800,1197,843],{"class":814},[800,1199,846],{"class":810},[800,1201,1070],{"class":849},[800,1203,1073],{"class":814},[608,1205,1206],{},"With a framework integration, the logger is created when the request starts and emitted when the response ends. A handler only adds what it learns:",[1208,1209,1210,1372,1530,1683,1828],"framework-tabs",{},[790,1211,1214],{"className":792,"code":1212,"filename":240,"language":795,"meta":1213,"style":796},"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",[668,1215,1216,1235,1239,1271,1289,1293,1337,1357,1364],{"__ignoreMap":796},[800,1217,1218,1220,1222,1225,1227,1229,1231,1233],{"class":802,"line":803},[800,1219,807],{"class":806},[800,1221,811],{"class":810},[800,1223,1224],{"class":814}," useLogger",[800,1226,818],{"class":810},[800,1228,821],{"class":806},[800,1230,824],{"class":810},[800,1232,613],{"class":827},[800,1234,830],{"class":810},[800,1236,1237],{"class":802,"line":833},[800,1238,837],{"emptyLinePlaceholder":836},[800,1240,1241,1244,1247,1250,1252,1255,1258,1262,1265,1268],{"class":802,"line":840},[800,1242,1243],{"class":806},"export",[800,1245,1246],{"class":806}," default",[800,1248,1249],{"class":849}," defineEventHandler",[800,1251,852],{"class":814},[800,1253,1254],{"class":974},"async",[800,1256,1257],{"class":810}," (",[800,1259,1261],{"class":1260},"sHdIc","event",[800,1263,1264],{"class":810},")",[800,1266,1267],{"class":974}," =>",[800,1269,1270],{"class":810}," {\n",[800,1272,1273,1276,1278,1281,1283,1285,1287],{"class":802,"line":876},[800,1274,1275],{"class":974},"  const",[800,1277,815],{"class":814},[800,1279,1280],{"class":810}," 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log",[800,1300,846],{"class":810},[800,1302,1026],{"class":849},[800,1304,852],{"class":891},[800,1306,888],{"class":810},[800,1308,1161],{"class":891},[800,1310,895],{"class":810},[800,1312,811],{"class":810},[800,1314,1168],{"class":891},[800,1316,895],{"class":810},[800,1318,1173],{"class":926},[800,1320,863],{"class":810},[800,1322,1178],{"class":891},[800,1324,895],{"class":810},[800,1326,824],{"class":810},[800,1328,1185],{"class":827},[800,1330,855],{"class":810},[800,1332,818],{"class":810},[800,1334,818],{"class":810},[800,1336,873],{"class":891},[800,1338,1340,1343,1345,1348,1350,1354],{"class":802,"line":1339},7,[800,1341,1342],{"class":806},"  return",[800,1344,811],{"class":810},[800,1346,1347],{"class":891}," success",[800,1349,895],{"class":810},[800,1351,1353],{"class":1352},"sfNiH"," true",[800,1355,1356],{"class":810}," }\n",[800,1358,1360],{"class":802,"line":1359},8,[800,1361,1363],{"class":1362},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[800,1365,1367,1370],{"class":802,"line":1366},9,[800,1368,1369],{"class":810},"}",[800,1371,873],{"class":814},[790,1373,1376],{"className":792,"code":1374,"filename":255,"language":795,"meta":1375,"style":796},"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",[668,1377,1378,1398,1417,1421,1443,1459,1463,1505,1519,1523],{"__ignoreMap":796},[800,1379,1380,1382,1384,1387,1389,1391,1393,1396],{"class":802,"line":803},[800,1381,807],{"class":806},[800,1383,811],{"class":810},[800,1385,1386],{"class":814}," defineHandler",[800,1388,818],{"class":810},[800,1390,821],{"class":806},[800,1392,824],{"class":810},[800,1394,1395],{"class":827},"nitro\u002Fh3",[800,1397,830],{"class":810},[800,1399,1400,1402,1404,1406,1408,1410,1412,1415],{"class":802,"line":833},[800,1401,807],{"class":806},[800,1403,811],{"class":810},[800,1405,1224],{"class":814},[800,1407,818],{"class":810},[800,1409,821],{"class":806},[800,1411,824],{"class":810},[800,1413,1414],{"class":827},"evlog\u002Fnitro\u002Fv3",[800,1416,830],{"class":810},[800,1418,1419],{"class":802,"line":840},[800,1420,837],{"emptyLinePlaceholder":836},[800,1422,1423,1425,1427,1429,1431,1433,1435,1437,1439,1441],{"class":802,"line":876},[800,1424,1243],{"class":806},[800,1426,1246],{"class":806},[800,1428,1386],{"class":849},[800,1430,852],{"class":814},[800,1432,1254],{"class":974},[800,1434,1257],{"class":810},[800,1436,1261],{"class":1260},[800,1438,1264],{"class":810},[800,1440,1267],{"class":974},[800,1442,1270],{"class":810},[800,1444,1445,1447,1449,1451,1453,1455,1457],{"class":802,"line":1063},[800,1446,1275],{"class":974},[800,1448,815],{"class":814},[800,1450,1280],{"class":810},[800,1452,1224],{"class":849},[800,1454,852],{"class":891},[800,1456,1261],{"class":814},[800,1458,873],{"class":891},[800,1460,1461],{"class":802,"line":1295},[800,1462,837],{"emptyLinePlaceholder":836},[800,1464,1465,1467,1469,1471,1473,1475,1477,1479,1481,1483,1485,1487,1489,1491,1493,1495,1497,1499,1501,1503],{"class":802,"line":1339},[800,1466,1298],{"class":814},[800,1468,846],{"class":810},[800,1470,1026],{"class":849},[800,1472,852],{"class":891},[800,1474,888],{"class":810},[800,1476,1161],{"class":891},[800,1478,895],{"class":810},[800,1480,811],{"class":810},[800,1482,1168],{"class":891},[800,1484,895],{"class":810},[800,1486,1173],{"class":926},[800,1488,863],{"class":810},[800,1490,1178],{"class":891},[800,1492,895],{"class":810},[800,1494,824],{"class":810},[800,1496,1185],{"class":827},[800,1498,855],{"class":810},[800,1500,818],{"class":810},[800,1502,818],{"class":810},[800,1504,873],{"class":891},[800,1506,1507,1509,1511,1513,1515,1517],{"class":802,"line":1359},[800,1508,1342],{"class":806},[800,1510,811],{"class":810},[800,1512,1347],{"class":891},[800,1514,895],{"class":810},[800,1516,1353],{"class":1352},[800,1518,1356],{"class":810},[800,1520,1521],{"class":802,"line":1366},[800,1522,1363],{"class":1362},[800,1524,1526,1528],{"class":802,"line":1525},10,[800,1527,1369],{"class":810},[800,1529,873],{"class":814},[790,1531,1534],{"className":792,"code":1532,"filename":245,"language":795,"meta":1533,"style":796},"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",[668,1535,1536,1560,1564,1589,1601,1605,1647,1673,1677],{"__ignoreMap":796},[800,1537,1538,1540,1542,1545,1547,1549,1551,1553,1555,1558],{"class":802,"line":803},[800,1539,807],{"class":806},[800,1541,811],{"class":810},[800,1543,1544],{"class":814}," withEvlog",[800,1546,863],{"class":810},[800,1548,1224],{"class":814},[800,1550,818],{"class":810},[800,1552,821],{"class":806},[800,1554,824],{"class":810},[800,1556,1557],{"class":827},"@\u002Flib\u002Fevlog",[800,1559,830],{"class":810},[800,1561,1562],{"class":802,"line":833},[800,1563,837],{"emptyLinePlaceholder":836},[800,1565,1566,1568,1571,1574,1576,1578,1580,1582,1585,1587],{"class":802,"line":840},[800,1567,1243],{"class":806},[800,1569,1570],{"class":974}," const",[800,1572,1573],{"class":814}," POST ",[800,1575,981],{"class":810},[800,1577,1544],{"class":849},[800,1579,852],{"class":814},[800,1581,1254],{"class":974},[800,1583,1584],{"class":810}," ()",[800,1586,1267],{"class":974},[800,1588,1270],{"class":810},[800,1590,1591,1593,1595,1597,1599],{"class":802,"line":876},[800,1592,1275],{"class":974},[800,1594,815],{"class":814},[800,1596,1280],{"class":810},[800,1598,1224],{"class":849},[800,1600,1073],{"class":891},[800,1602,1603],{"class":802,"line":1063},[800,1604,837],{"emptyLinePlaceholder":836},[800,1606,1607,1609,1611,1613,1615,1617,1619,1621,1623,1625,1627,1629,1631,1633,1635,1637,1639,1641,1643,1645],{"class":802,"line":1295},[800,1608,1298],{"class":814},[800,1610,846],{"class":810},[800,1612,1026],{"class":849},[800,1614,852],{"class":891},[800,1616,888],{"class":810},[800,1618,1161],{"class":891},[800,1620,895],{"class":810},[800,1622,811],{"class":810},[800,1624,1168],{"class":891},[800,1626,895],{"class":810},[800,1628,1173],{"class":926},[800,1630,863],{"class":810},[800,1632,1178],{"class":891},[800,1634,895],{"class":810},[800,1636,824],{"class":810},[800,1638,1185],{"class":827},[800,1640,855],{"class":810},[800,1642,818],{"class":810},[800,1644,818],{"class":810},[800,1646,873],{"class":891},[800,1648,1649,1651,1654,1656,1659,1661,1663,1665,1667,1669,1671],{"class":802,"line":1339},[800,1650,1342],{"class":806},[800,1652,1653],{"class":814}," Response",[800,1655,846],{"class":810},[800,1657,1658],{"class":849},"json",[800,1660,852],{"class":891},[800,1662,888],{"class":810},[800,1664,1347],{"class":891},[800,1666,895],{"class":810},[800,1668,1353],{"class":1352},[800,1670,818],{"class":810},[800,1672,873],{"class":891},[800,1674,1675],{"class":802,"line":1359},[800,1676,1363],{"class":1362},[800,1678,1679,1681],{"class":802,"line":1366},[800,1680,1369],{"class":810},[800,1682,873],{"class":814},[790,1684,1686],{"className":792,"code":1685,"filename":275,"language":795,"meta":794,"style":796},"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",[668,1687,1688,1722,1748,1752,1794,1818,1822],{"__ignoreMap":796},[800,1689,1690,1693,1695,1698,1700,1702,1704,1706,1708,1711,1713,1716,1718,1720],{"class":802,"line":803},[800,1691,1692],{"class":814},"app",[800,1694,846],{"class":810},[800,1696,1697],{"class":849},"post",[800,1699,852],{"class":814},[800,1701,855],{"class":810},[800,1703,1140],{"class":827},[800,1705,855],{"class":810},[800,1707,863],{"class":810},[800,1709,1710],{"class":974}," async",[800,1712,1257],{"class":810},[800,1714,1715],{"class":1260},"c",[800,1717,1264],{"class":810},[800,1719,1267],{"class":974},[800,1721,1270],{"class":810},[800,1723,1724,1726,1728,1730,1733,1735,1738,1740,1742,1744,1746],{"class":802,"line":833},[800,1725,1275],{"class":974},[800,1727,815],{"class":814},[800,1729,1280],{"class":810},[800,1731,1732],{"class":814}," c",[800,1734,846],{"class":810},[800,1736,1737],{"class":849},"get",[800,1739,852],{"class":891},[800,1741,855],{"class":810},[800,1743,843],{"class":827},[800,1745,855],{"class":810},[800,1747,873],{"class":891},[800,1749,1750],{"class":802,"line":840},[800,1751,837],{"emptyLinePlaceholder":836},[800,1753,1754,1756,1758,1760,1762,1764,1766,1768,1770,1772,1774,1776,1778,1780,1782,1784,1786,1788,1790,1792],{"class":802,"line":876},[800,1755,1298],{"class":814},[800,1757,846],{"class":810},[800,1759,1026],{"class":849},[800,1761,852],{"class":891},[800,1763,888],{"class":810},[800,1765,1161],{"class":891},[800,1767,895],{"class":810},[800,1769,811],{"class":810},[800,1771,1168],{"class":891},[800,1773,895],{"class":810},[800,1775,1173],{"class":926},[800,1777,863],{"class":810},[800,1779,1178],{"class":891},[800,1781,895],{"class":810},[800,1783,824],{"class":810},[800,1785,1185],{"class":827},[800,1787,855],{"class":810},[800,1789,818],{"class":810},[800,1791,818],{"class":810},[800,1793,873],{"class":891},[800,1795,1796,1798,1800,1802,1804,1806,1808,1810,1812,1814,1816],{"class":802,"line":1063},[800,1797,1342],{"class":806},[800,1799,1732],{"class":814},[800,1801,846],{"class":810},[800,1803,1658],{"class":849},[800,1805,852],{"class":891},[800,1807,888],{"class":810},[800,1809,1347],{"class":891},[800,1811,895],{"class":810},[800,1813,1353],{"class":1352},[800,1815,818],{"class":810},[800,1817,873],{"class":891},[800,1819,1820],{"class":802,"line":1295},[800,1821,1363],{"class":1362},[800,1823,1824,1826],{"class":802,"line":1339},[800,1825,1369],{"class":810},[800,1827,873],{"class":814},[790,1829,1831],{"className":792,"code":1830,"filename":270,"language":795,"meta":794,"style":796},"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",[668,1832,1833,1869,1885,1889,1931,1955,1959],{"__ignoreMap":796},[800,1834,1835,1837,1839,1841,1843,1845,1847,1849,1851,1853,1855,1858,1860,1863,1865,1867],{"class":802,"line":803},[800,1836,1692],{"class":814},[800,1838,846],{"class":810},[800,1840,1697],{"class":849},[800,1842,852],{"class":814},[800,1844,855],{"class":810},[800,1846,1140],{"class":827},[800,1848,855],{"class":810},[800,1850,863],{"class":810},[800,1852,1710],{"class":974},[800,1854,1257],{"class":810},[800,1856,1857],{"class":1260},"req",[800,1859,863],{"class":810},[800,1861,1862],{"class":1260}," res",[800,1864,1264],{"class":810},[800,1866,1267],{"class":974},[800,1868,1270],{"class":810},[800,1870,1871,1873,1875,1877,1880,1882],{"class":802,"line":833},[800,1872,1275],{"class":974},[800,1874,815],{"class":814},[800,1876,1280],{"class":810},[800,1878,1879],{"class":814}," req",[800,1881,846],{"class":810},[800,1883,1884],{"class":814},"log\n",[800,1886,1887],{"class":802,"line":840},[800,1888,837],{"emptyLinePlaceholder":836},[800,1890,1891,1893,1895,1897,1899,1901,1903,1905,1907,1909,1911,1913,1915,1917,1919,1921,1923,1925,1927,1929],{"class":802,"line":876},[800,1892,1298],{"class":814},[800,1894,846],{"class":810},[800,1896,1026],{"class":849},[800,1898,852],{"class":891},[800,1900,888],{"class":810},[800,1902,1161],{"class":891},[800,1904,895],{"class":810},[800,1906,811],{"class":810},[800,1908,1168],{"class":891},[800,1910,895],{"class":810},[800,1912,1173],{"class":926},[800,1914,863],{"class":810},[800,1916,1178],{"class":891},[800,1918,895],{"class":810},[800,1920,824],{"class":810},[800,1922,1185],{"class":827},[800,1924,855],{"class":810},[800,1926,818],{"class":810},[800,1928,818],{"class":810},[800,1930,873],{"class":891},[800,1932,1933,1935,1937,1939,1941,1943,1945,1947,1949,1951,1953],{"class":802,"line":1063},[800,1934,1342],{"class":806},[800,1936,1862],{"class":814},[800,1938,846],{"class":810},[800,1940,1658],{"class":849},[800,1942,852],{"class":891},[800,1944,888],{"class":810},[800,1946,1347],{"class":891},[800,1948,895],{"class":810},[800,1950,1353],{"class":1352},[800,1952,818],{"class":810},[800,1954,873],{"class":891},[800,1956,1957],{"class":802,"line":1295},[800,1958,1363],{"class":1362},[800,1960,1961,1963],{"class":802,"line":1339},[800,1962,1369],{"class":810},[800,1964,873],{"class":814},[608,1966,1967],{},"One log, all context. Everything you need to understand what happened.",[780,1969,56],{"id":1970},"structured-errors",[608,1972,1973,1974,1976,1977,1979,1980,1982],{},"Errors with actionable context: ",[668,1975,741],{}," it happened, how to ",[668,1978,745],{}," it, and a ",[668,1981,748],{}," to docs:",[939,1984,1985,2109],{},[790,1986,1989],{"className":792,"code":1987,"filename":1988,"language":795,"meta":796,"style":796},"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","services\u002Fcheckout.ts",[668,1990,1991,2010,2014,2026,2043,2055,2071,2087,2103],{"__ignoreMap":796},[800,1992,1993,1995,1997,2000,2002,2004,2006,2008],{"class":802,"line":803},[800,1994,807],{"class":806},[800,1996,811],{"class":810},[800,1998,1999],{"class":814}," createError",[800,2001,818],{"class":810},[800,2003,821],{"class":806},[800,2005,824],{"class":810},[800,2007,613],{"class":827},[800,2009,830],{"class":810},[800,2011,2012],{"class":802,"line":833},[800,2013,837],{"emptyLinePlaceholder":836},[800,2015,2016,2019,2021,2023],{"class":802,"line":840},[800,2017,2018],{"class":806},"throw",[800,2020,1999],{"class":849},[800,2022,852],{"class":814},[800,2024,2025],{"class":810},"{\n",[800,2027,2028,2031,2033,2035,2038,2040],{"class":802,"line":876},[800,2029,2030],{"class":891},"  message",[800,2032,895],{"class":810},[800,2034,824],{"class":810},[800,2036,2037],{"class":827},"Payment failed",[800,2039,855],{"class":810},[800,2041,2042],{"class":810},",\n",[800,2044,2045,2048,2050,2053],{"class":802,"line":1063},[800,2046,2047],{"class":891},"  status",[800,2049,895],{"class":810},[800,2051,2052],{"class":926}," 402",[800,2054,2042],{"class":810},[800,2056,2057,2060,2062,2064,2067,2069],{"class":802,"line":1295},[800,2058,2059],{"class":891},"  why",[800,2061,895],{"class":810},[800,2063,824],{"class":810},[800,2065,2066],{"class":827},"Card declined by issuer (insufficient funds)",[800,2068,855],{"class":810},[800,2070,2042],{"class":810},[800,2072,2073,2076,2078,2080,2083,2085],{"class":802,"line":1339},[800,2074,2075],{"class":891},"  fix",[800,2077,895],{"class":810},[800,2079,824],{"class":810},[800,2081,2082],{"class":827},"Try a different payment method or contact your bank",[800,2084,855],{"class":810},[800,2086,2042],{"class":810},[800,2088,2089,2092,2094,2096,2099,2101],{"class":802,"line":1359},[800,2090,2091],{"class":891},"  link",[800,2093,895],{"class":810},[800,2095,824],{"class":810},[800,2097,2098],{"class":827},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[800,2100,855],{"class":810},[800,2102,2042],{"class":810},[800,2104,2105,2107],{"class":802,"line":1366},[800,2106,1369],{"class":810},[800,2108,873],{"class":814},[790,2110,2114],{"className":2111,"code":2112,"filename":2113,"language":1658,"meta":796,"style":796},"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",[668,2115,2116,2120,2137,2157,2170,2190,2208,2225,2230],{"__ignoreMap":796},[800,2117,2118],{"class":802,"line":803},[800,2119,2025],{"class":810},[800,2121,2122,2125,2128,2131,2133,2135],{"class":802,"line":833},[800,2123,2124],{"class":810},"  \"",[800,2126,2127],{"class":974},"statusCode",[800,2129,2130],{"class":810},"\"",[800,2132,895],{"class":810},[800,2134,2052],{"class":926},[800,2136,2042],{"class":810},[800,2138,2139,2141,2144,2146,2148,2151,2153,2155],{"class":802,"line":840},[800,2140,2124],{"class":810},[800,2142,2143],{"class":974},"message",[800,2145,2130],{"class":810},[800,2147,895],{"class":810},[800,2149,2150],{"class":810}," \"",[800,2152,2037],{"class":827},[800,2154,2130],{"class":810},[800,2156,2042],{"class":810},[800,2158,2159,2161,2164,2166,2168],{"class":802,"line":876},[800,2160,2124],{"class":810},[800,2162,2163],{"class":974},"data",[800,2165,2130],{"class":810},[800,2167,895],{"class":810},[800,2169,1270],{"class":810},[800,2171,2172,2175,2178,2180,2182,2184,2186,2188],{"class":802,"line":1063},[800,2173,2174],{"class":810},"    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}\n",[800,2231,2232],{"class":802,"line":1366},[800,2233,2234],{"class":810},"}\n",[647,2236,2238],{"id":2237},"why-one-event-beats-ten-lines","Why one event beats ten lines",[608,2240,2241,2242,2245],{},"We're entering an era where AI agents build, debug, and maintain applications. These agents need ",[611,2243,2244],{},"structured context"," to work effectively:",[704,2247,2248,2255,2262],{},[707,2249,2250,2254],{},[611,2251,2252],{},[668,2253,741],{},": The root cause, so the agent understands what went wrong",[707,2256,2257,2261],{},[611,2258,2259],{},[668,2260,745],{},": An actionable solution the agent can suggest or apply",[707,2263,2264,2268],{},[611,2265,2266],{},[668,2267,748],{},": Documentation for complex issues",[608,2270,2271,2272,2274,2275,2278],{},"Traditional ",[668,2273,670],{}," and generic ",[668,2276,2277],{},"throw new Error()"," provide no actionable context. evlog's structured output is designed for both humans and AI to parse and act on.",[647,2280,2282],{"id":2281},"next-steps","Next Steps",[704,2284,2285,2296,2309],{},[707,2286,2287,2290,2291,2293,2294,846],{},[611,2288,2289],{},"Try evlog:"," follow ",[619,2292,20],{"href":21}," and the ",[619,2295,25],{"href":26},[707,2297,2298,2301,2302,2305,2306,2308],{},[611,2299,2300],{},"Decide 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