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When something goes wrong, you're left grep-ing through noise hoping to find signal.",[582,629,630,632],{},[585,631,587],{}," takes a different approach:",[634,635,636,646,649,652],"card-group",{},[637,638,640,641,645],"card",{"icon":49,"title":639},"Structured Logging","Replace ",[642,643,644],"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.",[637,647,648],{"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.",[637,650,651],{"icon":59,"title":56},"Errors that explain why they occurred and how to fix them.",[637,653,656],{"icon":654,"title":655},"i-lucide-palette","Pretty for Dev","Human-readable in development, machine-parseable JSON in production.",[658,659,662,663,666,667,669],"callout",{"color":660,"icon":661},"info","i-lucide-globe","Not running an HTTP framework? See ",[593,664,665],{"href":301},"Standalone TypeScript"," for scripts, workers, and CLIs, and ",[593,668,295],{"href":296}," for the edge runtime.",[621,671,673],{"id":672},"why-evlog-over-pino-winston-or-consola","Why evlog over pino, winston, or consola",[582,675,676],{},"evlog is a fully-featured general-purpose logger that happens to also do wide events. Concretely:",[678,679,680,690,708,725],"ul",{},[681,682,683,686,687,689],"li",{},[585,684,685],{},"Zero runtime dependencies in the core package."," Start with the logger and add integrations as you need them. See ",[593,688,383],{"href":526}," for bundle sizes and benchmarks.",[681,691,692,695,696,699,700,703,704,707],{},[585,693,694],{},"Same API in every context",": scripts, frameworks, edge runtimes, browser, library code. No ",[642,697,698],{},"pino-http"," vs ",[642,701,702],{},"pino"," split, no separate ",[642,705,706],{},"consola"," reporters per environment.",[681,709,710,724],{},[585,711,712,713,716,717,716,720,723],{},"Structured errors with ",[642,714,715],{},"why"," \u002F ",[642,718,719],{},"fix",[642,721,722],{},"link"," built in",": your error toast finally tells users what went wrong and what to do, your on-call stops reverse-engineering stack traces.",[681,726,727,730,731,734,735,738],{},[585,728,729],{},"Wide events as a free upgrade path",": when you need to correlate context across an operation, the same logger gives you ",[642,732,733],{},"log.set"," + ",[642,736,737],{},"log.emit"," instead of stitching log lines together later.",[582,740,741,742,745],{},"See the full ",[593,743,744],{"href":539},"feature comparison"," (parity matrix, honest gaps, and migration snippets) for a side-by-side with pino, winston, and consola.",[621,747,749],{"id":748},"pick-one-of-three-ways-to-log","Pick one of three ways to log",[582,751,752],{},"evlog provides three APIs for different contexts. You can use all three in the same project.",[754,755,46],"h3",{"id":756},"simple-logging",[582,758,759,760,762],{},"Fire-and-forget structured logs. Replace ",[642,761,644],{},", consola, or pino:",[764,765,771],"pre",{"className":766,"code":767,"filename":768,"language":769,"meta":770,"style":770},"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","",[642,772,773,805,812,848],{"__ignoreMap":770},[774,775,778,782,786,790,793,796,799,802],"span",{"class":776,"line":777},"line",1,[774,779,781],{"class":780},"s7zQu","import",[774,783,785],{"class":784},"sMK4o"," {",[774,787,789],{"class":788},"sTEyZ"," log",[774,791,792],{"class":784}," }",[774,794,795],{"class":780}," from",[774,797,798],{"class":784}," '",[774,800,587],{"class":801},"sfazB",[774,803,804],{"class":784},"'\n",[774,806,808],{"class":776,"line":807},2,[774,809,811],{"emptyLinePlaceholder":810},true,"\n",[774,813,815,818,821,824,827,830,833,835,838,840,843,845],{"class":776,"line":814},3,[774,816,817],{"class":788},"log",[774,819,820],{"class":784},".",[774,822,660],{"class":823},"s2Zo4",[774,825,826],{"class":788},"(",[774,828,829],{"class":784},"'",[774,831,832],{"class":801},"auth",[774,834,829],{"class":784},[774,836,837],{"class":784},",",[774,839,798],{"class":784},[774,841,842],{"class":801},"User logged in",[774,844,829],{"class":784},[774,846,847],{"class":788},")\n",[774,849,851,853,855,858,860,863,867,870,872,875,877,879,882,884,886,889,891,893,896,898,902,904],{"class":776,"line":850},4,[774,852,817],{"class":788},[774,854,820],{"class":784},[774,856,857],{"class":823},"error",[774,859,826],{"class":788},[774,861,862],{"class":784},"{",[774,864,866],{"class":865},"swJcz"," action",[774,868,869],{"class":784},":",[774,871,798],{"class":784},[774,873,874],{"class":801},"payment",[774,876,829],{"class":784},[774,878,837],{"class":784},[774,880,881],{"class":865}," error",[774,883,869],{"class":784},[774,885,798],{"class":784},[774,887,888],{"class":801},"card_declined",[774,890,829],{"class":784},[774,892,837],{"class":784},[774,894,895],{"class":865}," userId",[774,897,869],{"class":784},[774,899,901],{"class":900},"sbssI"," 42",[774,903,792],{"class":784},[774,905,847],{"class":788},[754,907,51],{"id":908},"wide-events",[582,910,911],{},"Accumulate context progressively over any operation, then emit a single comprehensive event:",[913,914,915,1048,1178],"code-group",{},[764,916,919],{"className":766,"code":917,"filename":918,"language":769,"meta":770,"style":770},"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",[642,920,921,940,944,992,1035],{"__ignoreMap":770},[774,922,923,925,927,930,932,934,936,938],{"class":776,"line":777},[774,924,781],{"class":780},[774,926,785],{"class":784},[774,928,929],{"class":788}," createLogger",[774,931,792],{"class":784},[774,933,795],{"class":780},[774,935,798],{"class":784},[774,937,587],{"class":801},[774,939,804],{"class":784},[774,941,942],{"class":776,"line":807},[774,943,811],{"emptyLinePlaceholder":810},[774,945,946,950,953,956,958,960,962,965,967,969,972,974,976,979,981,983,986,988,990],{"class":776,"line":814},[774,947,949],{"class":948},"spNyl","const",[774,951,952],{"class":788}," log ",[774,954,955],{"class":784},"=",[774,957,929],{"class":823},[774,959,826],{"class":788},[774,961,862],{"class":784},[774,963,964],{"class":865}," jobId",[774,966,869],{"class":784},[774,968,798],{"class":784},[774,970,971],{"class":801},"sync-001",[774,973,829],{"class":784},[774,975,837],{"class":784},[774,977,978],{"class":865}," queue",[774,980,869],{"class":784},[774,982,798],{"class":784},[774,984,985],{"class":801},"emails",[774,987,829],{"class":784},[774,989,792],{"class":784},[774,991,847],{"class":788},[774,993,994,996,998,1001,1003,1005,1008,1010,1012,1015,1017,1020,1022,1025,1027,1029,1031,1033],{"class":776,"line":850},[774,995,817],{"class":788},[774,997,820],{"class":784},[774,999,1000],{"class":823},"set",[774,1002,826],{"class":788},[774,1004,862],{"class":784},[774,1006,1007],{"class":865}," batch",[774,1009,869],{"class":784},[774,1011,785],{"class":784},[774,1013,1014],{"class":865}," size",[774,1016,869],{"class":784},[774,1018,1019],{"class":900}," 50",[774,1021,837],{"class":784},[774,1023,1024],{"class":865}," processed",[774,1026,869],{"class":784},[774,1028,1019],{"class":900},[774,1030,792],{"class":784},[774,1032,792],{"class":784},[774,1034,847],{"class":788},[774,1036,1038,1040,1042,1045],{"class":776,"line":1037},5,[774,1039,817],{"class":788},[774,1041,820],{"class":784},[774,1043,1044],{"class":823},"emit",[774,1046,1047],{"class":788},"()\n",[764,1049,1052],{"className":766,"code":1050,"filename":1051,"language":769,"meta":770,"style":770},"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",[642,1053,1054,1073,1077,1121,1168],{"__ignoreMap":770},[774,1055,1056,1058,1060,1063,1065,1067,1069,1071],{"class":776,"line":777},[774,1057,781],{"class":780},[774,1059,785],{"class":784},[774,1061,1062],{"class":788}," createRequestLogger",[774,1064,792],{"class":784},[774,1066,795],{"class":780},[774,1068,798],{"class":784},[774,1070,587],{"class":801},[774,1072,804],{"class":784},[774,1074,1075],{"class":776,"line":807},[774,1076,811],{"emptyLinePlaceholder":810},[774,1078,1079,1081,1083,1085,1087,1089,1091,1094,1096,1098,1101,1103,1105,1108,1110,1112,1115,1117,1119],{"class":776,"line":814},[774,1080,949],{"class":948},[774,1082,952],{"class":788},[774,1084,955],{"class":784},[774,1086,1062],{"class":823},[774,1088,826],{"class":788},[774,1090,862],{"class":784},[774,1092,1093],{"class":865}," method",[774,1095,869],{"class":784},[774,1097,798],{"class":784},[774,1099,1100],{"class":801},"POST",[774,1102,829],{"class":784},[774,1104,837],{"class":784},[774,1106,1107],{"class":865}," path",[774,1109,869],{"class":784},[774,1111,798],{"class":784},[774,1113,1114],{"class":801},"\u002Fapi\u002Fcheckout",[774,1116,829],{"class":784},[774,1118,792],{"class":784},[774,1120,847],{"class":788},[774,1122,1123,1125,1127,1129,1131,1133,1136,1138,1140,1143,1145,1148,1150,1153,1155,1157,1160,1162,1164,1166],{"class":776,"line":850},[774,1124,817],{"class":788},[774,1126,820],{"class":784},[774,1128,1000],{"class":823},[774,1130,826],{"class":788},[774,1132,862],{"class":784},[774,1134,1135],{"class":865}," user",[774,1137,869],{"class":784},[774,1139,785],{"class":784},[774,1141,1142],{"class":865}," id",[774,1144,869],{"class":784},[774,1146,1147],{"class":900}," 1",[774,1149,837],{"class":784},[774,1151,1152],{"class":865}," plan",[774,1154,869],{"class":784},[774,1156,798],{"class":784},[774,1158,1159],{"class":801},"pro",[774,1161,829],{"class":784},[774,1163,792],{"class":784},[774,1165,792],{"class":784},[774,1167,847],{"class":788},[774,1169,1170,1172,1174,1176],{"class":776,"line":1037},[774,1171,817],{"class":788},[774,1173,820],{"class":784},[774,1175,1044],{"class":823},[774,1177,1047],{"class":788},[764,1179,1182],{"className":766,"code":1180,"filename":1181,"language":769,"meta":770,"style":770},"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",[642,1183,1184,1203,1207,1239,1257,1300,1320,1327],{"__ignoreMap":770},[774,1185,1186,1188,1190,1193,1195,1197,1199,1201],{"class":776,"line":777},[774,1187,781],{"class":780},[774,1189,785],{"class":784},[774,1191,1192],{"class":788}," useLogger",[774,1194,792],{"class":784},[774,1196,795],{"class":780},[774,1198,798],{"class":784},[774,1200,587],{"class":801},[774,1202,804],{"class":784},[774,1204,1205],{"class":776,"line":807},[774,1206,811],{"emptyLinePlaceholder":810},[774,1208,1209,1212,1215,1218,1220,1223,1226,1230,1233,1236],{"class":776,"line":814},[774,1210,1211],{"class":780},"export",[774,1213,1214],{"class":780}," default",[774,1216,1217],{"class":823}," defineEventHandler",[774,1219,826],{"class":788},[774,1221,1222],{"class":948},"async",[774,1224,1225],{"class":784}," (",[774,1227,1229],{"class":1228},"sHdIc","event",[774,1231,1232],{"class":784},")",[774,1234,1235],{"class":948}," =>",[774,1237,1238],{"class":784}," {\n",[774,1240,1241,1244,1246,1249,1251,1253,1255],{"class":776,"line":850},[774,1242,1243],{"class":948},"  const",[774,1245,789],{"class":788},[774,1247,1248],{"class":784}," =",[774,1250,1192],{"class":823},[774,1252,826],{"class":865},[774,1254,1229],{"class":788},[774,1256,847],{"class":865},[774,1258,1259,1262,1264,1266,1268,1270,1272,1274,1276,1278,1280,1282,1284,1286,1288,1290,1292,1294,1296,1298],{"class":776,"line":1037},[774,1260,1261],{"class":788},"  log",[774,1263,820],{"class":784},[774,1265,1000],{"class":823},[774,1267,826],{"class":865},[774,1269,862],{"class":784},[774,1271,1135],{"class":865},[774,1273,869],{"class":784},[774,1275,785],{"class":784},[774,1277,1142],{"class":865},[774,1279,869],{"class":784},[774,1281,1147],{"class":900},[774,1283,837],{"class":784},[774,1285,1152],{"class":865},[774,1287,869],{"class":784},[774,1289,798],{"class":784},[774,1291,1159],{"class":801},[774,1293,829],{"class":784},[774,1295,792],{"class":784},[774,1297,792],{"class":784},[774,1299,847],{"class":865},[774,1301,1303,1306,1308,1311,1313,1317],{"class":776,"line":1302},6,[774,1304,1305],{"class":780},"  return",[774,1307,785],{"class":784},[774,1309,1310],{"class":865}," success",[774,1312,869],{"class":784},[774,1314,1316],{"class":1315},"sfNiH"," true",[774,1318,1319],{"class":784}," }\n",[774,1321,1323],{"class":776,"line":1322},7,[774,1324,1326],{"class":1325},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[774,1328,1330,1333],{"class":776,"line":1329},8,[774,1331,1332],{"class":784},"}",[774,1334,847],{"class":788},[582,1336,1337],{},"One log, all context. Everything you need to understand what happened.",[754,1339,56],{"id":1340},"structured-errors",[582,1342,1343,1344,1346,1347,1349,1350,1352],{},"Errors with actionable context: ",[642,1345,715],{}," it happened, how to ",[642,1348,719],{}," it, and a ",[642,1351,722],{}," to docs:",[913,1354,1355,1479],{},[764,1356,1358],{"className":766,"code":1357,"filename":1181,"language":769,"meta":770,"style":770},"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",[642,1359,1360,1379,1383,1395,1412,1424,1440,1456,1472],{"__ignoreMap":770},[774,1361,1362,1364,1366,1369,1371,1373,1375,1377],{"class":776,"line":777},[774,1363,781],{"class":780},[774,1365,785],{"class":784},[774,1367,1368],{"class":788}," createError",[774,1370,792],{"class":784},[774,1372,795],{"class":780},[774,1374,798],{"class":784},[774,1376,587],{"class":801},[774,1378,804],{"class":784},[774,1380,1381],{"class":776,"line":807},[774,1382,811],{"emptyLinePlaceholder":810},[774,1384,1385,1388,1390,1392],{"class":776,"line":814},[774,1386,1387],{"class":780},"throw",[774,1389,1368],{"class":823},[774,1391,826],{"class":788},[774,1393,1394],{"class":784},"{\n",[774,1396,1397,1400,1402,1404,1407,1409],{"class":776,"line":850},[774,1398,1399],{"class":865},"  message",[774,1401,869],{"class":784},[774,1403,798],{"class":784},[774,1405,1406],{"class":801},"Payment failed",[774,1408,829],{"class":784},[774,1410,1411],{"class":784},",\n",[774,1413,1414,1417,1419,1422],{"class":776,"line":1037},[774,1415,1416],{"class":865},"  status",[774,1418,869],{"class":784},[774,1420,1421],{"class":900}," 402",[774,1423,1411],{"class":784},[774,1425,1426,1429,1431,1433,1436,1438],{"class":776,"line":1302},[774,1427,1428],{"class":865},"  why",[774,1430,869],{"class":784},[774,1432,798],{"class":784},[774,1434,1435],{"class":801},"Card declined by issuer (insufficient funds)",[774,1437,829],{"class":784},[774,1439,1411],{"class":784},[774,1441,1442,1445,1447,1449,1452,1454],{"class":776,"line":1322},[774,1443,1444],{"class":865},"  fix",[774,1446,869],{"class":784},[774,1448,798],{"class":784},[774,1450,1451],{"class":801},"Try a different payment method or contact your bank",[774,1453,829],{"class":784},[774,1455,1411],{"class":784},[774,1457,1458,1461,1463,1465,1468,1470],{"class":776,"line":1329},[774,1459,1460],{"class":865},"  link",[774,1462,869],{"class":784},[774,1464,798],{"class":784},[774,1466,1467],{"class":801},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[774,1469,829],{"class":784},[774,1471,1411],{"class":784},[774,1473,1475,1477],{"class":776,"line":1474},9,[774,1476,1332],{"class":784},[774,1478,847],{"class":788},[764,1480,1485],{"className":1481,"code":1482,"filename":1483,"language":1484,"meta":770,"style":770},"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",[642,1486,1487,1491,1508,1528,1541,1561,1579,1596,1601],{"__ignoreMap":770},[774,1488,1489],{"class":776,"line":777},[774,1490,1394],{"class":784},[774,1492,1493,1496,1499,1502,1504,1506],{"class":776,"line":807},[774,1494,1495],{"class":784},"  \"",[774,1497,1498],{"class":948},"statusCode",[774,1500,1501],{"class":784},"\"",[774,1503,869],{"class":784},[774,1505,1421],{"class":900},[774,1507,1411],{"class":784},[774,1509,1510,1512,1515,1517,1519,1522,1524,1526],{"class":776,"line":814},[774,1511,1495],{"class":784},[774,1513,1514],{"class":948},"message",[774,1516,1501],{"class":784},[774,1518,869],{"class":784},[774,1520,1521],{"class":784}," \"",[774,1523,1406],{"class":801},[774,1525,1501],{"class":784},[774,1527,1411],{"class":784},[774,1529,1530,1532,1535,1537,1539],{"class":776,"line":850},[774,1531,1495],{"class":784},[774,1533,1534],{"class":948},"data",[774,1536,1501],{"class":784},[774,1538,869],{"class":784},[774,1540,1238],{"class":784},[774,1542,1543,1546,1549,1551,1553,1555,1557,1559],{"class":776,"line":1037},[774,1544,1545],{"class":784},"    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These agents need ",[585,1614,1615],{},"structured context"," to work effectively:",[678,1618,1619,1626,1633],{},[681,1620,1621,1625],{},[585,1622,1623],{},[642,1624,715],{},": The root cause, so the agent understands what went wrong",[681,1627,1628,1632],{},[585,1629,1630],{},[642,1631,719],{},": An actionable solution the agent can suggest or apply",[681,1634,1635,1639],{},[585,1636,1637],{},[642,1638,722],{},": Documentation for complex issues",[582,1641,1642,1643,1645,1646,1649],{},"Traditional ",[642,1644,644],{}," and generic ",[642,1647,1648],{},"throw new Error()"," provide no actionable context. evlog's structured output is designed for both humans and AI to parse and act on.",[621,1651,1653],{"id":1652},"next-steps","Next Steps",[678,1655,1656,1667,1680],{},[681,1657,1658,1661,1662,1664,1665,820],{},[585,1659,1660],{},"Try evlog:"," follow ",[593,1663,20],{"href":21}," and the ",[593,1666,25],{"href":26},[681,1668,1669,1672,1673,1676,1677,1679],{},[585,1670,1671],{},"Decide 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