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When something goes wrong, you're left grep-ing through noise hoping to find signal.",[587,634,635,637],{},[590,636,592],{}," takes a different approach:",[639,640,641,651,654,657],"card-group",{},[642,643,645,646,650],"card",{"icon":49,"title":644},"Structured Logging","Replace ",[647,648,649],"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.",[642,652,653],{"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.",[642,655,656],{"icon":59,"title":56},"Errors that explain why they occurred and how to fix them.",[642,658,661],{"icon":659,"title":660},"i-lucide-palette","Pretty for Dev","Human-readable in development, machine-parseable JSON in production.",[663,664,667,668,671,672,674],"callout",{"color":665,"icon":666},"info","i-lucide-globe","Not running an HTTP framework? See ",[598,669,670],{"href":301},"Standalone TypeScript"," for scripts, workers, and CLIs, and ",[598,673,295],{"href":296}," for the edge runtime.",[626,676,678],{"id":677},"why-evlog-over-pino-winston-or-consola","Why evlog over pino, winston, or consola",[587,680,681],{},"evlog is a fully-featured general-purpose logger that happens to also do wide events. Concretely:",[683,684,685,695,713,730],"ul",{},[686,687,688,691,692,694],"li",{},[590,689,690],{},"Zero runtime dependencies in the core package."," Start with the logger and add integrations as you need them. See ",[598,693,383],{"href":531}," for bundle sizes and benchmarks.",[686,696,697,700,701,704,705,708,709,712],{},[590,698,699],{},"Same API in every context",": scripts, frameworks, edge runtimes, browser, library code. No ",[647,702,703],{},"pino-http"," vs ",[647,706,707],{},"pino"," split, no separate ",[647,710,711],{},"consola"," reporters per environment.",[686,714,715,729],{},[590,716,717,718,721,722,721,725,728],{},"Structured errors with ",[647,719,720],{},"why"," \u002F ",[647,723,724],{},"fix",[647,726,727],{},"link"," built in",": your error toast finally tells users what went wrong and what to do, your on-call stops reverse-engineering stack traces.",[686,731,732,735,736,739,740,743],{},[590,733,734],{},"Wide events as a free upgrade path",": when you need to correlate context across an operation, the same logger gives you ",[647,737,738],{},"log.set"," + ",[647,741,742],{},"log.emit"," instead of stitching log lines together later.",[587,745,746,747,750],{},"See the full ",[598,748,749],{"href":544},"feature comparison"," (parity matrix, honest gaps, and migration snippets) for a side-by-side with pino, winston, and consola.",[626,752,754],{"id":753},"pick-one-of-three-ways-to-log","Pick one of three ways to log",[587,756,757],{},"evlog provides three APIs for different contexts. You can use all three in the same project.",[759,760,46],"h3",{"id":761},"simple-logging",[587,763,764,765,767],{},"Fire-and-forget structured logs. Replace ",[647,766,649],{},", consola, or pino:",[769,770,776],"pre",{"className":771,"code":772,"filename":773,"language":774,"meta":775,"style":775},"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","",[647,777,778,810,817,853],{"__ignoreMap":775},[779,780,783,787,791,795,798,801,804,807],"span",{"class":781,"line":782},"line",1,[779,784,786],{"class":785},"s7zQu","import",[779,788,790],{"class":789},"sMK4o"," {",[779,792,794],{"class":793},"sTEyZ"," log",[779,796,797],{"class":789}," }",[779,799,800],{"class":785}," from",[779,802,803],{"class":789}," '",[779,805,592],{"class":806},"sfazB",[779,808,809],{"class":789},"'\n",[779,811,813],{"class":781,"line":812},2,[779,814,816],{"emptyLinePlaceholder":815},true,"\n",[779,818,820,823,826,829,832,835,838,840,843,845,848,850],{"class":781,"line":819},3,[779,821,822],{"class":793},"log",[779,824,825],{"class":789},".",[779,827,665],{"class":828},"s2Zo4",[779,830,831],{"class":793},"(",[779,833,834],{"class":789},"'",[779,836,837],{"class":806},"auth",[779,839,834],{"class":789},[779,841,842],{"class":789},",",[779,844,803],{"class":789},[779,846,847],{"class":806},"User logged in",[779,849,834],{"class":789},[779,851,852],{"class":793},")\n",[779,854,856,858,860,863,865,868,872,875,877,880,882,884,887,889,891,894,896,898,901,903,907,909],{"class":781,"line":855},4,[779,857,822],{"class":793},[779,859,825],{"class":789},[779,861,862],{"class":828},"error",[779,864,831],{"class":793},[779,866,867],{"class":789},"{",[779,869,871],{"class":870},"swJcz"," action",[779,873,874],{"class":789},":",[779,876,803],{"class":789},[779,878,879],{"class":806},"payment",[779,881,834],{"class":789},[779,883,842],{"class":789},[779,885,886],{"class":870}," error",[779,888,874],{"class":789},[779,890,803],{"class":789},[779,892,893],{"class":806},"card_declined",[779,895,834],{"class":789},[779,897,842],{"class":789},[779,899,900],{"class":870}," userId",[779,902,874],{"class":789},[779,904,906],{"class":905},"sbssI"," 42",[779,908,797],{"class":789},[779,910,852],{"class":793},[759,912,51],{"id":913},"wide-events",[587,915,916],{},"Accumulate context progressively over any operation, then emit a single comprehensive event:",[918,919,920,1053,1183],"code-group",{},[769,921,924],{"className":771,"code":922,"filename":923,"language":774,"meta":775,"style":775},"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",[647,925,926,945,949,997,1040],{"__ignoreMap":775},[779,927,928,930,932,935,937,939,941,943],{"class":781,"line":782},[779,929,786],{"class":785},[779,931,790],{"class":789},[779,933,934],{"class":793}," createLogger",[779,936,797],{"class":789},[779,938,800],{"class":785},[779,940,803],{"class":789},[779,942,592],{"class":806},[779,944,809],{"class":789},[779,946,947],{"class":781,"line":812},[779,948,816],{"emptyLinePlaceholder":815},[779,950,951,955,958,961,963,965,967,970,972,974,977,979,981,984,986,988,991,993,995],{"class":781,"line":819},[779,952,954],{"class":953},"spNyl","const",[779,956,957],{"class":793}," log ",[779,959,960],{"class":789},"=",[779,962,934],{"class":828},[779,964,831],{"class":793},[779,966,867],{"class":789},[779,968,969],{"class":870}," jobId",[779,971,874],{"class":789},[779,973,803],{"class":789},[779,975,976],{"class":806},"sync-001",[779,978,834],{"class":789},[779,980,842],{"class":789},[779,982,983],{"class":870}," queue",[779,985,874],{"class":789},[779,987,803],{"class":789},[779,989,990],{"class":806},"emails",[779,992,834],{"class":789},[779,994,797],{"class":789},[779,996,852],{"class":793},[779,998,999,1001,1003,1006,1008,1010,1013,1015,1017,1020,1022,1025,1027,1030,1032,1034,1036,1038],{"class":781,"line":855},[779,1000,822],{"class":793},[779,1002,825],{"class":789},[779,1004,1005],{"class":828},"set",[779,1007,831],{"class":793},[779,1009,867],{"class":789},[779,1011,1012],{"class":870}," batch",[779,1014,874],{"class":789},[779,1016,790],{"class":789},[779,1018,1019],{"class":870}," size",[779,1021,874],{"class":789},[779,1023,1024],{"class":905}," 50",[779,1026,842],{"class":789},[779,1028,1029],{"class":870}," processed",[779,1031,874],{"class":789},[779,1033,1024],{"class":905},[779,1035,797],{"class":789},[779,1037,797],{"class":789},[779,1039,852],{"class":793},[779,1041,1043,1045,1047,1050],{"class":781,"line":1042},5,[779,1044,822],{"class":793},[779,1046,825],{"class":789},[779,1048,1049],{"class":828},"emit",[779,1051,1052],{"class":793},"()\n",[769,1054,1057],{"className":771,"code":1055,"filename":1056,"language":774,"meta":775,"style":775},"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",[647,1058,1059,1078,1082,1126,1173],{"__ignoreMap":775},[779,1060,1061,1063,1065,1068,1070,1072,1074,1076],{"class":781,"line":782},[779,1062,786],{"class":785},[779,1064,790],{"class":789},[779,1066,1067],{"class":793}," createRequestLogger",[779,1069,797],{"class":789},[779,1071,800],{"class":785},[779,1073,803],{"class":789},[779,1075,592],{"class":806},[779,1077,809],{"class":789},[779,1079,1080],{"class":781,"line":812},[779,1081,816],{"emptyLinePlaceholder":815},[779,1083,1084,1086,1088,1090,1092,1094,1096,1099,1101,1103,1106,1108,1110,1113,1115,1117,1120,1122,1124],{"class":781,"line":819},[779,1085,954],{"class":953},[779,1087,957],{"class":793},[779,1089,960],{"class":789},[779,1091,1067],{"class":828},[779,1093,831],{"class":793},[779,1095,867],{"class":789},[779,1097,1098],{"class":870}," method",[779,1100,874],{"class":789},[779,1102,803],{"class":789},[779,1104,1105],{"class":806},"POST",[779,1107,834],{"class":789},[779,1109,842],{"class":789},[779,1111,1112],{"class":870}," path",[779,1114,874],{"class":789},[779,1116,803],{"class":789},[779,1118,1119],{"class":806},"\u002Fapi\u002Fcheckout",[779,1121,834],{"class":789},[779,1123,797],{"class":789},[779,1125,852],{"class":793},[779,1127,1128,1130,1132,1134,1136,1138,1141,1143,1145,1148,1150,1153,1155,1158,1160,1162,1165,1167,1169,1171],{"class":781,"line":855},[779,1129,822],{"class":793},[779,1131,825],{"class":789},[779,1133,1005],{"class":828},[779,1135,831],{"class":793},[779,1137,867],{"class":789},[779,1139,1140],{"class":870}," user",[779,1142,874],{"class":789},[779,1144,790],{"class":789},[779,1146,1147],{"class":870}," id",[779,1149,874],{"class":789},[779,1151,1152],{"class":905}," 1",[779,1154,842],{"class":789},[779,1156,1157],{"class":870}," plan",[779,1159,874],{"class":789},[779,1161,803],{"class":789},[779,1163,1164],{"class":806},"pro",[779,1166,834],{"class":789},[779,1168,797],{"class":789},[779,1170,797],{"class":789},[779,1172,852],{"class":793},[779,1174,1175,1177,1179,1181],{"class":781,"line":1042},[779,1176,822],{"class":793},[779,1178,825],{"class":789},[779,1180,1049],{"class":828},[779,1182,1052],{"class":793},[769,1184,1187],{"className":771,"code":1185,"filename":1186,"language":774,"meta":775,"style":775},"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",[647,1188,1189,1208,1212,1244,1262,1305,1325,1332],{"__ignoreMap":775},[779,1190,1191,1193,1195,1198,1200,1202,1204,1206],{"class":781,"line":782},[779,1192,786],{"class":785},[779,1194,790],{"class":789},[779,1196,1197],{"class":793}," useLogger",[779,1199,797],{"class":789},[779,1201,800],{"class":785},[779,1203,803],{"class":789},[779,1205,592],{"class":806},[779,1207,809],{"class":789},[779,1209,1210],{"class":781,"line":812},[779,1211,816],{"emptyLinePlaceholder":815},[779,1213,1214,1217,1220,1223,1225,1228,1231,1235,1238,1241],{"class":781,"line":819},[779,1215,1216],{"class":785},"export",[779,1218,1219],{"class":785}," default",[779,1221,1222],{"class":828}," defineEventHandler",[779,1224,831],{"class":793},[779,1226,1227],{"class":953},"async",[779,1229,1230],{"class":789}," (",[779,1232,1234],{"class":1233},"sHdIc","event",[779,1236,1237],{"class":789},")",[779,1239,1240],{"class":953}," =>",[779,1242,1243],{"class":789}," {\n",[779,1245,1246,1249,1251,1254,1256,1258,1260],{"class":781,"line":855},[779,1247,1248],{"class":953},"  const",[779,1250,794],{"class":793},[779,1252,1253],{"class":789}," =",[779,1255,1197],{"class":828},[779,1257,831],{"class":870},[779,1259,1234],{"class":793},[779,1261,852],{"class":870},[779,1263,1264,1267,1269,1271,1273,1275,1277,1279,1281,1283,1285,1287,1289,1291,1293,1295,1297,1299,1301,1303],{"class":781,"line":1042},[779,1265,1266],{"class":793},"  log",[779,1268,825],{"class":789},[779,1270,1005],{"class":828},[779,1272,831],{"class":870},[779,1274,867],{"class":789},[779,1276,1140],{"class":870},[779,1278,874],{"class":789},[779,1280,790],{"class":789},[779,1282,1147],{"class":870},[779,1284,874],{"class":789},[779,1286,1152],{"class":905},[779,1288,842],{"class":789},[779,1290,1157],{"class":870},[779,1292,874],{"class":789},[779,1294,803],{"class":789},[779,1296,1164],{"class":806},[779,1298,834],{"class":789},[779,1300,797],{"class":789},[779,1302,797],{"class":789},[779,1304,852],{"class":870},[779,1306,1308,1311,1313,1316,1318,1322],{"class":781,"line":1307},6,[779,1309,1310],{"class":785},"  return",[779,1312,790],{"class":789},[779,1314,1315],{"class":870}," success",[779,1317,874],{"class":789},[779,1319,1321],{"class":1320},"sfNiH"," true",[779,1323,1324],{"class":789}," }\n",[779,1326,1328],{"class":781,"line":1327},7,[779,1329,1331],{"class":1330},"sHwdD","  \u002F\u002F auto-emitted on response end\n",[779,1333,1335,1338],{"class":781,"line":1334},8,[779,1336,1337],{"class":789},"}",[779,1339,852],{"class":793},[587,1341,1342],{},"One log, all context. Everything you need to understand what happened.",[759,1344,56],{"id":1345},"structured-errors",[587,1347,1348,1349,1351,1352,1354,1355,1357],{},"Errors with actionable context: ",[647,1350,720],{}," it happened, how to ",[647,1353,724],{}," it, and a ",[647,1356,727],{}," to docs:",[918,1359,1360,1484],{},[769,1361,1363],{"className":771,"code":1362,"filename":1186,"language":774,"meta":775,"style":775},"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",[647,1364,1365,1384,1388,1400,1417,1429,1445,1461,1477],{"__ignoreMap":775},[779,1366,1367,1369,1371,1374,1376,1378,1380,1382],{"class":781,"line":782},[779,1368,786],{"class":785},[779,1370,790],{"class":789},[779,1372,1373],{"class":793}," createError",[779,1375,797],{"class":789},[779,1377,800],{"class":785},[779,1379,803],{"class":789},[779,1381,592],{"class":806},[779,1383,809],{"class":789},[779,1385,1386],{"class":781,"line":812},[779,1387,816],{"emptyLinePlaceholder":815},[779,1389,1390,1393,1395,1397],{"class":781,"line":819},[779,1391,1392],{"class":785},"throw",[779,1394,1373],{"class":828},[779,1396,831],{"class":793},[779,1398,1399],{"class":789},"{\n",[779,1401,1402,1405,1407,1409,1412,1414],{"class":781,"line":855},[779,1403,1404],{"class":870},"  message",[779,1406,874],{"class":789},[779,1408,803],{"class":789},[779,1410,1411],{"class":806},"Payment failed",[779,1413,834],{"class":789},[779,1415,1416],{"class":789},",\n",[779,1418,1419,1422,1424,1427],{"class":781,"line":1042},[779,1420,1421],{"class":870},"  status",[779,1423,874],{"class":789},[779,1425,1426],{"class":905}," 402",[779,1428,1416],{"class":789},[779,1430,1431,1434,1436,1438,1441,1443],{"class":781,"line":1307},[779,1432,1433],{"class":870},"  why",[779,1435,874],{"class":789},[779,1437,803],{"class":789},[779,1439,1440],{"class":806},"Card declined by issuer (insufficient funds)",[779,1442,834],{"class":789},[779,1444,1416],{"class":789},[779,1446,1447,1450,1452,1454,1457,1459],{"class":781,"line":1327},[779,1448,1449],{"class":870},"  fix",[779,1451,874],{"class":789},[779,1453,803],{"class":789},[779,1455,1456],{"class":806},"Try a different payment method or contact your bank",[779,1458,834],{"class":789},[779,1460,1416],{"class":789},[779,1462,1463,1466,1468,1470,1473,1475],{"class":781,"line":1334},[779,1464,1465],{"class":870},"  link",[779,1467,874],{"class":789},[779,1469,803],{"class":789},[779,1471,1472],{"class":806},"https:\u002F\u002Fdocs.example.com\u002Fpayments\u002Fdeclined",[779,1474,834],{"class":789},[779,1476,1416],{"class":789},[779,1478,1480,1482],{"class":781,"line":1479},9,[779,1481,1337],{"class":789},[779,1483,852],{"class":793},[769,1485,1490],{"className":1486,"code":1487,"filename":1488,"language":1489,"meta":775,"style":775},"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",[647,1491,1492,1496,1513,1533,1546,1566,1584,1601,1606],{"__ignoreMap":775},[779,1493,1494],{"class":781,"line":782},[779,1495,1399],{"class":789},[779,1497,1498,1501,1504,1507,1509,1511],{"class":781,"line":812},[779,1499,1500],{"class":789},"  \"",[779,1502,1503],{"class":953},"statusCode",[779,1505,1506],{"class":789},"\"",[779,1508,874],{"class":789},[779,1510,1426],{"class":905},[779,1512,1416],{"class":789},[779,1514,1515,1517,1520,1522,1524,1527,1529,1531],{"class":781,"line":819},[779,1516,1500],{"class":789},[779,1518,1519],{"class":953},"message",[779,1521,1506],{"class":789},[779,1523,874],{"class":789},[779,1525,1526],{"class":789}," \"",[779,1528,1411],{"class":806},[779,1530,1506],{"class":789},[779,1532,1416],{"class":789},[779,1534,1535,1537,1540,1542,1544],{"class":781,"line":855},[779,1536,1500],{"class":789},[779,1538,1539],{"class":953},"data",[779,1541,1506],{"class":789},[779,1543,874],{"class":789},[779,1545,1243],{"class":789},[779,1547,1548,1551,1554,1556,1558,1560,1562,1564],{"class":781,"line":1042},[779,1549,1550],{"class":789},"    \"",[779,1552,720],{"class":1553},"sBMFI",[779,1555,1506],{"class":789},[779,1557,874],{"class":789},[779,1559,1526],{"class":789},[779,1561,1440],{"class":806},[779,1563,1506],{"class":789},[779,1565,1416],{"class":789},[779,1567,1568,1570,1572,1574,1576,1578,1580,1582],{"class":781,"line":1307},[779,1569,1550],{"class":789},[779,1571,724],{"class":1553},[779,1573,1506],{"class":789},[779,1575,874],{"class":789},[779,1577,1526],{"class":789},[779,1579,1456],{"class":806},[779,1581,1506],{"class":789},[779,1583,1416],{"class":789},[779,1585,1586,1588,1590,1592,1594,1596,1598],{"class":781,"line":1327},[779,1587,1550],{"class":789},[779,1589,727],{"class":1553},[779,1591,1506],{"class":789},[779,1593,874],{"class":789},[779,1595,1526],{"class":789},[779,1597,1472],{"class":806},[779,1599,1600],{"class":789},"\"\n",[779,1602,1603],{"class":781,"line":1334},[779,1604,1605],{"class":789},"  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These agents need ",[590,1619,1620],{},"structured context"," to work effectively:",[683,1623,1624,1631,1638],{},[686,1625,1626,1630],{},[590,1627,1628],{},[647,1629,720],{},": The root cause, so the agent understands what went wrong",[686,1632,1633,1637],{},[590,1634,1635],{},[647,1636,724],{},": An actionable solution the agent can suggest or apply",[686,1639,1640,1644],{},[590,1641,1642],{},[647,1643,727],{},": Documentation for complex issues",[587,1646,1647,1648,1650,1651,1654],{},"Traditional ",[647,1649,649],{}," and generic ",[647,1652,1653],{},"throw new Error()"," provide no actionable context. evlog's structured output is designed for both humans and AI to parse and act on.",[626,1656,1658],{"id":1657},"next-steps","Next Steps",[683,1660,1661,1672,1685],{},[686,1662,1663,1666,1667,1669,1670,825],{},[590,1664,1665],{},"Try evlog:"," follow ",[598,1668,20],{"href":21}," and the ",[598,1671,25],{"href":26},[686,1673,1674,1677,1678,1681,1682,1684],{},[590,1675,1676],{},"Decide 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