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Performance is tracked on every pull request via ",[562,563,567],"a",{"href":564,"rel":565},"https:\u002F\u002Fcodspeed.io",[566],"nofollow","CodSpeed",".",[570,571,573],"h2",{"id":572},"evlog-vs-alternatives","evlog vs alternatives",[553,575,576,577,581],{},"All benchmarks run with JSON output to no-op destinations. pino writes to ",[578,579,580],"code",{},"\u002Fdev\u002Fnull"," (sync), winston writes to a no-op stream, consola uses a no-op reporter, evlog uses silent mode.",[583,584,586],"h3",{"id":585},"results","Results",[588,589],"bench-bar-race",{},[591,592,593,616],"table",{},[594,595,596],"thead",{},[597,598,599,603,607,610,613],"tr",{},[600,601,602],"th",{},"Scenario",[600,604,606],{"align":605},"right","evlog",[600,608,609],{"align":605},"pino",[600,611,612],{"align":605},"consola",[600,614,615],{"align":605},"winston",[617,618,619,639,658,678,697,716,735],"tbody",{},[597,620,621,625,628,631,636],{},[622,623,624],"td",{},"Simple string log",[622,626,627],{"align":605},"1.83M ops\u002Fs",[622,629,630],{"align":605},"1.09M",[622,632,633],{"align":605},[557,634,635],{},"2.79M",[622,637,638],{"align":605},"1.20M",[597,640,641,644,647,650,655],{},[622,642,643],{},"Structured (5 fields)",[622,645,646],{"align":605},"1.64M ops\u002Fs",[622,648,649],{"align":605},"716.1K",[622,651,652],{"align":605},[557,653,654],{},"1.71M",[622,656,657],{"align":605},"431.6K",[597,659,660,663,669,672,675],{},[622,661,662],{},"Deep nested log",[622,664,665,668],{"align":605},[557,666,667],{},"1.55M"," ops\u002Fs",[622,670,671],{"align":605},"464.9K",[622,673,674],{"align":605},"1.01M",[622,676,677],{"align":605},"164.0K",[597,679,680,683,688,691,694],{},[622,681,682],{},"Child \u002F scoped logger",[622,684,685,668],{"align":605},[557,686,687],{},"1.70M",[622,689,690],{"align":605},"845.0K",[622,692,693],{"align":605},"280.4K",[622,695,696],{"align":605},"430.0K",[597,698,699,702,707,710,713],{},[622,700,701],{},"Wide event lifecycle",[622,703,704,668],{"align":605},[557,705,706],{},"1.58M",[622,708,709],{"align":605},"205.8K",[622,711,712],{"align":605},"—",[622,714,715],{"align":605},"111.9K",[597,717,718,721,724,727,732],{},[622,719,720],{},"Burst (100 logs)",[622,722,723],{"align":605},"17.8K ops\u002Fs",[622,725,726],{"align":605},"10.3K",[622,728,729],{"align":605},[557,730,731],{},"39.4K",[622,733,734],{"align":605},"7.5K",[597,736,737,740,745,748,751],{},[622,738,739],{},"Logger creation",[622,741,742,668],{"align":605},[557,743,744],{},"16.85M",[622,746,747],{"align":605},"7.50M",[622,749,750],{"align":605},"310.3K",[622,752,753],{"align":605},"5.38M",[553,755,756,757,760,761,764,765,768,769,772],{},"evlog wins ",[557,758,759],{},"4 out of 7"," head-to-head comparisons, and the wins that matter most are decisive: ",[557,762,763],{},"7.7x faster"," than pino in the wide event pattern, ",[557,766,767],{},"2.3x faster"," logger creation, and ",[557,770,771],{},"3.3x faster"," deep nested logging. consola edges ahead on simple strings and burst (it uses a no-op reporter with no serialization), but evlog produces a single correlated event per request where traditional loggers emit N separate lines.",[774,775,777,780,781,785],"callout",{"color":776,"icon":13},"info",[557,778,779],{},"Why this matters",": in the wide event pattern (one event per request, the real-world API shape), evlog is 7.7x faster than pino and 14.1x faster than winston while sending 75% less data to your log drain and giving you one queryable event instead of 4 disconnected lines. The 7.7x is not a brute-force win — pino doesn't try to accumulate context, so the comparison reflects an architectural difference, not a fairness issue. See ",[562,782,784],{"href":783},"#when-evlog-might-not-win","When evlog might not win"," for the honest gaps.",[583,787,789],{"id":788},"what-is-the-wide-event-lifecycle","What is the \"wide event lifecycle\"?",[553,791,792],{},"This benchmark simulates a real API request:",[794,795,796,1062],"code-group",{},[797,798,804],"pre",{"className":799,"code":800,"filename":801,"language":802,"meta":803,"style":803},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const log = createLogger({ method: 'POST', path: '\u002Fapi\u002Fcheckout', requestId: 'req_abc' })\nlog.set({ user: { id: 'usr_123', plan: 'pro' } })\nlog.set({ cart: { items: 3, total: 9999 } })\nlog.set({ payment: { method: 'card', last4: '4242' } })\nlog.emit({ status: 200 })\n","evlog (1 event)","typescript","",[578,805,806,885,940,985,1036],{"__ignoreMap":803},[807,808,811,815,819,823,827,830,833,837,840,843,847,850,853,856,858,860,863,865,867,870,872,874,877,879,882],"span",{"class":809,"line":810},"line",1,[807,812,814],{"class":813},"spNyl","const",[807,816,818],{"class":817},"sTEyZ"," log ",[807,820,822],{"class":821},"sMK4o","=",[807,824,826],{"class":825},"s2Zo4"," createLogger",[807,828,829],{"class":817},"(",[807,831,832],{"class":821},"{",[807,834,836],{"class":835},"swJcz"," method",[807,838,839],{"class":821},":",[807,841,842],{"class":821}," '",[807,844,846],{"class":845},"sfazB","POST",[807,848,849],{"class":821},"'",[807,851,852],{"class":821},",",[807,854,855],{"class":835}," path",[807,857,839],{"class":821},[807,859,842],{"class":821},[807,861,862],{"class":845},"\u002Fapi\u002Fcheckout",[807,864,849],{"class":821},[807,866,852],{"class":821},[807,868,869],{"class":835}," requestId",[807,871,839],{"class":821},[807,873,842],{"class":821},[807,875,876],{"class":845},"req_abc",[807,878,849],{"class":821},[807,880,881],{"class":821}," }",[807,883,884],{"class":817},")\n",[807,886,888,891,893,896,898,900,903,905,908,911,913,915,918,920,922,925,927,929,932,934,936,938],{"class":809,"line":887},2,[807,889,890],{"class":817},"log",[807,892,568],{"class":821},[807,894,895],{"class":825},"set",[807,897,829],{"class":817},[807,899,832],{"class":821},[807,901,902],{"class":835}," user",[807,904,839],{"class":821},[807,906,907],{"class":821}," {",[807,909,910],{"class":835}," id",[807,912,839],{"class":821},[807,914,842],{"class":821},[807,916,917],{"class":845},"usr_123",[807,919,849],{"class":821},[807,921,852],{"class":821},[807,923,924],{"class":835}," plan",[807,926,839],{"class":821},[807,928,842],{"class":821},[807,930,931],{"class":845},"pro",[807,933,849],{"class":821},[807,935,881],{"class":821},[807,937,881],{"class":821},[807,939,884],{"class":817},[807,941,943,945,947,949,951,953,956,958,960,963,965,969,971,974,976,979,981,983],{"class":809,"line":942},3,[807,944,890],{"class":817},[807,946,568],{"class":821},[807,948,895],{"class":825},[807,950,829],{"class":817},[807,952,832],{"class":821},[807,954,955],{"class":835}," cart",[807,957,839],{"class":821},[807,959,907],{"class":821},[807,961,962],{"class":835}," items",[807,964,839],{"class":821},[807,966,968],{"class":967},"sbssI"," 3",[807,970,852],{"class":821},[807,972,973],{"class":835}," total",[807,975,839],{"class":821},[807,977,978],{"class":967}," 9999",[807,980,881],{"class":821},[807,982,881],{"class":821},[807,984,884],{"class":817},[807,986,988,990,992,994,996,998,1001,1003,1005,1007,1009,1011,1014,1016,1018,1021,1023,1025,1028,1030,1032,1034],{"class":809,"line":987},4,[807,989,890],{"class":817},[807,991,568],{"class":821},[807,993,895],{"class":825},[807,995,829],{"class":817},[807,997,832],{"class":821},[807,999,1000],{"class":835}," payment",[807,1002,839],{"class":821},[807,1004,907],{"class":821},[807,1006,836],{"class":835},[807,1008,839],{"class":821},[807,1010,842],{"class":821},[807,1012,1013],{"class":845},"card",[807,1015,849],{"class":821},[807,1017,852],{"class":821},[807,1019,1020],{"class":835}," last4",[807,1022,839],{"class":821},[807,1024,842],{"class":821},[807,1026,1027],{"class":845},"4242",[807,1029,849],{"class":821},[807,1031,881],{"class":821},[807,1033,881],{"class":821},[807,1035,884],{"class":817},[807,1037,1039,1041,1043,1046,1048,1050,1053,1055,1058,1060],{"class":809,"line":1038},5,[807,1040,890],{"class":817},[807,1042,568],{"class":821},[807,1044,1045],{"class":825},"emit",[807,1047,829],{"class":817},[807,1049,832],{"class":821},[807,1051,1052],{"class":835}," status",[807,1054,839],{"class":821},[807,1056,1057],{"class":967}," 200",[807,1059,881],{"class":821},[807,1061,884],{"class":817},[797,1063,1066],{"className":799,"code":1064,"filename":1065,"language":802,"meta":803,"style":803},"const child = pinoLogger.child({ method: 'POST', path: '\u002Fapi\u002Fcheckout', requestId: 'req_abc' })\nchild.info({ user: { id: 'usr_123', plan: 'pro' } }, 'user context')\nchild.info({ cart: { items: 3, total: 9999 } }, 'cart context')\nchild.info({ payment: { method: 'card', last4: '4242' } }, 'payment context')\nchild.info({ status: 200 }, 'request complete')\n","pino (4 log lines)",[578,1067,1068,1127,1181,1226,1279],{"__ignoreMap":803},[807,1069,1070,1072,1075,1077,1080,1082,1085,1087,1089,1091,1093,1095,1097,1099,1101,1103,1105,1107,1109,1111,1113,1115,1117,1119,1121,1123,1125],{"class":809,"line":810},[807,1071,814],{"class":813},[807,1073,1074],{"class":817}," child ",[807,1076,822],{"class":821},[807,1078,1079],{"class":817}," pinoLogger",[807,1081,568],{"class":821},[807,1083,1084],{"class":825},"child",[807,1086,829],{"class":817},[807,1088,832],{"class":821},[807,1090,836],{"class":835},[807,1092,839],{"class":821},[807,1094,842],{"class":821},[807,1096,846],{"class":845},[807,1098,849],{"class":821},[807,1100,852],{"class":821},[807,1102,855],{"class":835},[807,1104,839],{"class":821},[807,1106,842],{"class":821},[807,1108,862],{"class":845},[807,1110,849],{"class":821},[807,1112,852],{"class":821},[807,1114,869],{"class":835},[807,1116,839],{"class":821},[807,1118,842],{"class":821},[807,1120,876],{"class":845},[807,1122,849],{"class":821},[807,1124,881],{"class":821},[807,1126,884],{"class":817},[807,1128,1129,1131,1133,1135,1137,1139,1141,1143,1145,1147,1149,1151,1153,1155,1157,1159,1161,1163,1165,1167,1169,1172,1174,1177,1179],{"class":809,"line":887},[807,1130,1084],{"class":817},[807,1132,568],{"class":821},[807,1134,776],{"class":825},[807,1136,829],{"class":817},[807,1138,832],{"class":821},[807,1140,902],{"class":835},[807,1142,839],{"class":821},[807,1144,907],{"class":821},[807,1146,910],{"class":835},[807,1148,839],{"class":821},[807,1150,842],{"class":821},[807,1152,917],{"class":845},[807,1154,849],{"class":821},[807,1156,852],{"class":821},[807,1158,924],{"class":835},[807,1160,839],{"class":821},[807,1162,842],{"class":821},[807,1164,931],{"class":845},[807,1166,849],{"class":821},[807,1168,881],{"class":821},[807,1170,1171],{"class":821}," },",[807,1173,842],{"class":821},[807,1175,1176],{"class":845},"user context",[807,1178,849],{"class":821},[807,1180,884],{"class":817},[807,1182,1183,1185,1187,1189,1191,1193,1195,1197,1199,1201,1203,1205,1207,1209,1211,1213,1215,1217,1219,1222,1224],{"class":809,"line":942},[807,1184,1084],{"class":817},[807,1186,568],{"class":821},[807,1188,776],{"class":825},[807,1190,829],{"class":817},[807,1192,832],{"class":821},[807,1194,955],{"class":835},[807,1196,839],{"class":821},[807,1198,907],{"class":821},[807,1200,962],{"class":835},[807,1202,839],{"class":821},[807,1204,968],{"class":967},[807,1206,852],{"class":821},[807,1208,973],{"class":835},[807,1210,839],{"class":821},[807,1212,978],{"class":967},[807,1214,881],{"class":821},[807,1216,1171],{"class":821},[807,1218,842],{"class":821},[807,1220,1221],{"class":845},"cart context",[807,1223,849],{"class":821},[807,1225,884],{"class":817},[807,1227,1228,1230,1232,1234,1236,1238,1240,1242,1244,1246,1248,1250,1252,1254,1256,1258,1260,1262,1264,1266,1268,1270,1272,1275,1277],{"class":809,"line":987},[807,1229,1084],{"class":817},[807,1231,568],{"class":821},[807,1233,776],{"class":825},[807,1235,829],{"class":817},[807,1237,832],{"class":821},[807,1239,1000],{"class":835},[807,1241,839],{"class":821},[807,1243,907],{"class":821},[807,1245,836],{"class":835},[807,1247,839],{"class":821},[807,1249,842],{"class":821},[807,1251,1013],{"class":845},[807,1253,849],{"class":821},[807,1255,852],{"class":821},[807,1257,1020],{"class":835},[807,1259,839],{"class":821},[807,1261,842],{"class":821},[807,1263,1027],{"class":845},[807,1265,849],{"class":821},[807,1267,881],{"class":821},[807,1269,1171],{"class":821},[807,1271,842],{"class":821},[807,1273,1274],{"class":845},"payment context",[807,1276,849],{"class":821},[807,1278,884],{"class":817},[807,1280,1281,1283,1285,1287,1289,1291,1293,1295,1297,1299,1301,1304,1306],{"class":809,"line":1038},[807,1282,1084],{"class":817},[807,1284,568],{"class":821},[807,1286,776],{"class":825},[807,1288,829],{"class":817},[807,1290,832],{"class":821},[807,1292,1052],{"class":835},[807,1294,839],{"class":821},[807,1296,1057],{"class":967},[807,1298,1171],{"class":821},[807,1300,842],{"class":821},[807,1302,1303],{"class":845},"request complete",[807,1305,849],{"class":821},[807,1307,884],{"class":817},[553,1309,1310],{},"Same CPU cost, but evlog gives you everything in one place.",[570,1312,1314],{"id":1313},"why-is-evlog-faster","Why is evlog faster?",[553,1316,1317],{},"The numbers above aren't magic, they come from deliberate architectural choices:",[553,1319,1320,1323,1324,1327,1328,1331,1332,1335],{},[557,1321,1322],{},"In-place mutations, not copies."," ",[578,1325,1326],{},"log.set()"," writes directly into the context object via a recursive ",[578,1329,1330],{},"mergeInto"," function. Other loggers clone objects on every call (object spread, ",[578,1333,1334],{},"Object.assign","). evlog never allocates intermediate objects during context accumulation.",[553,1337,1338,1341,1342,1345,1346,1349],{},[557,1339,1340],{},"No serialization until drain."," Context stays as plain JavaScript objects throughout the request lifecycle. ",[578,1343,1344],{},"JSON.stringify"," runs exactly once, at emit time. Traditional loggers serialize on every ",[578,1347,1348],{},".info()"," call, that's 4x serialization for 4 log lines.",[553,1351,1352,1355,1356,1359],{},[557,1353,1354],{},"Lazy allocation."," Timestamps, sampling context, and override objects are only created when actually needed. If tail sampling is disabled (the common case), its context object is never allocated. The ",[578,1357,1358],{},"Date"," instance used for ISO timestamps is reused across calls.",[553,1361,1362,1365],{},[557,1363,1364],{},"One event, not N lines."," For a typical request, pino emits 4+ JSON lines that all need serializing, transporting, and indexing. evlog emits one. That's 75% less work for your log drain, fewer bytes on the wire, and one row to query instead of four.",[553,1367,1368,1371],{},[557,1369,1370],{},"RegExp caching."," Glob patterns (used in sampling and route matching) are compiled once and cached. Repeated evaluations hit the cache instead of recompiling.",[570,1373,784],{"id":1374},"when-evlog-might-not-win",[553,1376,1377],{},"The benchmarks above measure CPU + serialization cost on the main thread, with no real I\u002FO. That's the standard setup pino, winston, and logtape use for their own benchmarks — but it leaves out a few scenarios where another logger can edge ahead. Be honest about these:",[553,1379,1380,1383,1384,1389,1390,1393,1394,1397,1398,1401],{},[557,1381,1382],{},"Fire-and-forget hot paths with pino-via-worker-thread."," In production, pino is typically configured with a ",[562,1385,1388],{"href":1386,"rel":1387},"https:\u002F\u002Fgetpino.io\u002F#\u002Fdocs\u002Ftransports",[566],"worker-thread transport"," (",[578,1391,1392],{},"pino-pretty",", ",[578,1395,1396],{},"pino-loki",", vendor-specific transports). The serialization and I\u002FO move off the main thread entirely. For a workload that emits hundreds of thousands of ",[578,1399,1400],{},"log.info('foo')"," lines per second with no context accumulation, pino-via-worker can hit ~2-3M ops\u002Fs on the main thread because it's just queueing. We can't benchmark that mode fairly inside a single-threaded vitest process, so it's not in our table — but it's a real scenario where pino is faster.",[553,1403,1404,1407,1408,1411],{},[557,1405,1406],{},"CLI \u002F pretty-only output without serialization."," consola's no-op reporter mode in our benchmarks (",[578,1409,1410],{},"level: 4, reporters: [{ log: () => {} }]",") skips JSON serialization entirely. That's realistic if you're using consola for a CLI with terminal-only output, but it's why consola wins \"simple string\" and \"burst\" — it's not doing the same work. evlog and pino both serialize to JSON; consola in those benchmarks does not. If your use case is \"pretty terminal output, no shipping logs anywhere\", consola is genuinely lighter.",[553,1413,1414,1421,1422,1425,1426,1429,1430,1433],{},[557,1415,1416,1417,1420],{},"Single ",[578,1418,1419],{},"log.info"," calls, no context accumulation."," evlog and pino are roughly tied on ",[578,1423,1424],{},"pino.info('hello')"," vs ",[578,1427,1428],{},"evlog.info('hello')"," (1.83M vs 1.09M ops\u002Fs in our run, but the gap closes further if pino runs in async mode). evlog's ~7.7x advantage shows up specifically when you'd otherwise emit N separate lines for one logical operation. If you genuinely log one line per call and don't accumulate, the speed delta is much smaller — pick evlog for the API ergonomics (",[578,1431,1432],{},"log.set"," + structured errors), not raw throughput.",[553,1435,1436,1439,1440,1443],{},[557,1437,1438],{},"Wall-clock variance is real."," Vitest bench numbers shift ±5-10% between runs on the same machine (thermal throttling, GC, other processes). The numbers above come from a single run on a MacBook; CI tracks regressions via ",[562,1441,567],{"href":564,"rel":1442},[566],"'s CPU-instruction counting (deterministic, ±0.5% noise floor) but the absolute hz values in this page are the wall-clock snapshot, not a guaranteed floor.",[553,1445,1446,1447,1450],{},"The takeaway: ",[557,1448,1449],{},"the wins are real for the wide event pattern",", but if your stack is \"pure fire-and-forget pino with a worker transport\", that's the one place we don't claim to beat.",[570,1452,1454],{"id":1453},"real-world-overhead","Real-world overhead",[553,1456,1457],{},"For a typical API request:",[591,1459,1460,1470],{},[594,1461,1462],{},[597,1463,1464,1467],{},[600,1465,1466],{},"Component",[600,1468,1469],{"align":605},"Cost",[617,1471,1472,1479,1491,1501,1508,1516],{},[597,1473,1474,1476],{},[622,1475,739],{},[622,1477,1478],{"align":605},"52ns",[597,1480,1481,1488],{},[622,1482,1483,1484,1487],{},"3x ",[578,1485,1486],{},"set()"," calls",[622,1489,1490],{"align":605},"105ns",[597,1492,1493,1498],{},[622,1494,1495],{},[578,1496,1497],{},"emit()",[622,1499,1500],{"align":605},"588ns",[597,1502,1503,1505],{},[622,1504,175],{},[622,1506,1507],{"align":605},"22ns",[597,1509,1510,1513],{},[622,1511,1512],{},"Enricher pipeline",[622,1514,1515],{"align":605},"2.14µs",[597,1517,1518,1523],{},[622,1519,1520],{},[557,1521,1522],{},"Total",[622,1524,1525],{"align":605},[557,1526,1527],{},"~2.9µs",[553,1529,1530,1531,568],{},"For context, a database query takes 1-50ms, an HTTP call takes 10-500ms. evlog's overhead is ",[557,1532,1533],{},"invisible",[570,1535,1537],{"id":1536},"bundle-size","Bundle size",[553,1539,1540],{},"Every entry point is tree-shakeable. You only pay for what you import.",[591,1542,1543,1553],{},[594,1544,1545],{},[597,1546,1547,1550],{},[600,1548,1549],{},"Entry",[600,1551,1552],{"align":605},"Gzip",[617,1554,1555,1566,1577,1585,1593,1601,1609,1617,1625,1633],{},[597,1556,1557,1563],{},[622,1558,1559,1560,1562],{},"core (",[578,1561,606],{},")",[622,1564,1565],{"align":605},"510 B",[597,1567,1568,1574],{},[622,1569,1570,1571,1562],{},"toolkit (",[578,1572,1573],{},"evlog\u002Ftoolkit",[622,1575,1576],{"align":605},"720 B",[597,1578,1579,1582],{},[622,1580,1581],{},"utils",[622,1583,1584],{"align":605},"1.58 kB",[597,1586,1587,1590],{},[622,1588,1589],{},"error",[622,1591,1592],{"align":605},"1.46 kB",[597,1594,1595,1598],{},[622,1596,1597],{},"enrichers",[622,1599,1600],{"align":605},"1.99 kB",[597,1602,1603,1606],{},[622,1604,1605],{},"pipeline",[622,1607,1608],{"align":605},"1.35 kB",[597,1610,1611,1614],{},[622,1612,1613],{},"http",[622,1615,1616],{"align":605},"1.22 kB",[597,1618,1619,1622],{},[622,1620,1621],{},"browser",[622,1623,1624],{"align":605},"289 B",[597,1626,1627,1630],{},[622,1628,1629],{},"workers",[622,1631,1632],{"align":605},"1.30 kB",[597,1634,1635,1638],{},[622,1636,1637],{},"client",[622,1639,1640],{"align":605},"128 B",[553,1642,1643,1644,1647,1648,1651,1652,1655,1656,1393,1659,1393,1662,1665,1666,1669,1670,1673,1674,1677],{},"A typical Node.js bundle (",[578,1645,1646],{},"initLogger"," + ",[578,1649,1650],{},"createLogger",") measures ",[557,1653,1654],{},"~6.3 kB gzip"," end-to-end after tree-shaking; adding ",[578,1657,1658],{},"createRequestLogger",[578,1660,1661],{},"createError",[578,1663,1664],{},"parseError",", and ",[578,1667,1668],{},"useLogger"," brings the bundle to ",[557,1671,1672],{},"~7.2 kB gzip",". Adapters and framework integrations sit on top: Hono is 617 B, Express 734 B, Axiom 1.48 kB. Bundle size is tracked on every PR and compared against the ",[578,1675,1676],{},"main"," baseline.",[570,1679,1681],{"id":1680},"detailed-benchmarks","Detailed benchmarks",[583,1683,739],{"id":1684},"logger-creation",[591,1686,1687,1700],{},[594,1688,1689],{},[597,1690,1691,1694,1697],{},[600,1692,1693],{},"Operation",[600,1695,1696],{"align":605},"ops\u002Fsec",[600,1698,1699],{"align":605},"Mean",[617,1701,1702,1715,1728,1741,1755],{},[597,1703,1704,1710,1713],{},[622,1705,1706,1709],{},[578,1707,1708],{},"createLogger()"," (no context)",[622,1711,1712],{"align":605},"19.20M",[622,1714,1478],{"align":605},[597,1716,1717,1722,1725],{},[622,1718,1719,1721],{},[578,1720,1708],{}," (shallow context)",[622,1723,1724],{"align":605},"18.74M",[622,1726,1727],{"align":605},"53ns",[597,1729,1730,1735,1738],{},[622,1731,1732,1734],{},[578,1733,1708],{}," (nested context)",[622,1736,1737],{"align":605},"17.70M",[622,1739,1740],{"align":605},"56ns",[597,1742,1743,1749,1752],{},[622,1744,1745,1748],{},[578,1746,1747],{},"createRequestLogger()"," (method + path)",[622,1750,1751],{"align":605},"16.91M",[622,1753,1754],{"align":605},"59ns",[597,1756,1757,1762,1765],{},[622,1758,1759,1761],{},[578,1760,1747],{}," (method + path + requestId)",[622,1763,1764],{"align":605},"12.67M",[622,1766,1767],{"align":605},"79ns",[583,1769,1771,1772,1562],{"id":1770},"context-accumulation-logset","Context accumulation (",[578,1773,1326],{},[591,1775,1776,1786],{},[594,1777,1778],{},[597,1779,1780,1782,1784],{},[600,1781,1693],{},[600,1783,1696],{"align":605},[600,1785,1699],{"align":605},[617,1787,1788,1798,1809,1820],{},[597,1789,1790,1793,1796],{},[622,1791,1792],{},"Shallow merge (3 fields)",[622,1794,1795],{"align":605},"9.56M",[622,1797,1490],{"align":605},[597,1799,1800,1803,1806],{},[622,1801,1802],{},"Shallow merge (10 fields)",[622,1804,1805],{"align":605},"4.79M",[622,1807,1808],{"align":605},"209ns",[597,1810,1811,1814,1817],{},[622,1812,1813],{},"Deep nested merge",[622,1815,1816],{"align":605},"8.04M",[622,1818,1819],{"align":605},"124ns",[597,1821,1822,1825,1828],{},[622,1823,1824],{},"4 sequential calls",[622,1826,1827],{"align":605},"7.05M",[622,1829,1830],{"align":605},"142ns",[583,1832,1834,1835,1562],{"id":1833},"event-emission-logemit","Event emission (",[578,1836,1837],{},"log.emit()",[591,1839,1840,1850],{},[594,1841,1842],{},[597,1843,1844,1846,1848],{},[600,1845,1693],{},[600,1847,1696],{"align":605},[600,1849,1699],{"align":605},[617,1851,1852,1863,1872,1883],{},[597,1853,1854,1857,1860],{},[622,1855,1856],{},"Emit minimal event",[622,1858,1859],{"align":605},"1.93M",[622,1861,1862],{"align":605},"519ns",[597,1864,1865,1868,1870],{},[622,1866,1867],{},"Emit with context",[622,1869,687],{"align":605},[622,1871,1500],{"align":605},[597,1873,1874,1877,1880],{},[622,1875,1876],{},"Full lifecycle (create + 3 sets + emit)",[622,1878,1879],{"align":605},"1.59M",[622,1881,1882],{"align":605},"628ns",[597,1884,1885,1888,1891],{},[622,1886,1887],{},"Emit with error",[622,1889,1890],{"align":605},"65.9K",[622,1892,1893],{"align":605},"15.17µs",[774,1895,1898,1901,1902,1905],{"color":1896,"icon":1897},"amber","i-lucide-triangle-alert",[578,1899,1900],{},"emit with error"," is slower because ",[578,1903,1904],{},"Error.captureStackTrace()"," is an expensive V8 operation (~15µs). This only triggers when errors are thrown.",[583,1907,1909],{"id":1908},"payload-scaling","Payload scaling",[591,1911,1912,1923],{},[594,1913,1914],{},[597,1915,1916,1919,1921],{},[600,1917,1918],{},"Payload",[600,1920,1696],{"align":605},[600,1922,1699],{"align":605},[617,1924,1925,1936,1947],{},[597,1926,1927,1930,1933],{},[622,1928,1929],{},"Small (2 fields)",[622,1931,1932],{"align":605},"1.72M",[622,1934,1935],{"align":605},"581ns",[597,1937,1938,1941,1944],{},[622,1939,1940],{},"Medium (50 fields)",[622,1942,1943],{"align":605},"569.8K",[622,1945,1946],{"align":605},"1.76µs",[597,1948,1949,1952,1955],{},[622,1950,1951],{},"Large (200 nested fields)",[622,1953,1954],{"align":605},"131.2K",[622,1956,1957],{"align":605},"7.62µs",[583,1959,175],{"id":1960},"sampling",[591,1962,1963,1973],{},[594,1964,1965],{},[597,1966,1967,1969,1971],{},[600,1968,1693],{},[600,1970,1696],{"align":605},[600,1972,1699],{"align":605},[617,1974,1975,1985],{},[597,1976,1977,1980,1983],{},[622,1978,1979],{},"Tail sampling (shouldKeep)",[622,1981,1982],{"align":605},"44.97M",[622,1984,1507],{"align":605},[597,1986,1987,1990,1993],{},[622,1988,1989],{},"Full emit with head + tail",[622,1991,1992],{"align":605},"7.01M",[622,1994,1995],{"align":605},"143ns",[583,1997,532],{"id":1597},[591,1999,2000,2011],{},[594,2001,2002],{},[597,2003,2004,2007,2009],{},[600,2005,2006],{},"Enricher",[600,2008,1696],{"align":605},[600,2010,1699],{"align":605},[617,2012,2013,2024,2035,2046,2057],{},[597,2014,2015,2018,2021],{},[622,2016,2017],{},"User Agent (Chrome)",[622,2019,2020],{"align":605},"2.61M",[622,2022,2023],{"align":605},"384ns",[597,2025,2026,2029,2032],{},[622,2027,2028],{},"Geo (Vercel)",[622,2030,2031],{"align":605},"3.88M",[622,2033,2034],{"align":605},"258ns",[597,2036,2037,2040,2043],{},[622,2038,2039],{},"Request Size",[622,2041,2042],{"align":605},"12.37M",[622,2044,2045],{"align":605},"81ns",[597,2047,2048,2051,2054],{},[622,2049,2050],{},"Trace Context",[622,2052,2053],{"align":605},"4.35M",[622,2055,2056],{"align":605},"230ns",[597,2058,2059,2064,2069],{},[622,2060,2061],{},[557,2062,2063],{},"All combined (all headers)",[622,2065,2066],{"align":605},[557,2067,2068],{},"466.7K",[622,2070,2071],{"align":605},[557,2072,1515],{},[583,2074,2076],{"id":2075},"error-handling","Error handling",[591,2078,2079,2089],{},[594,2080,2081],{},[597,2082,2083,2085,2087],{},[600,2084,1693],{},[600,2086,1696],{"align":605},[600,2088,1699],{"align":605},[617,2090,2091,2104,2116],{},[597,2092,2093,2098,2101],{},[622,2094,2095],{},[578,2096,2097],{},"createError()",[622,2099,2100],{"align":605},"232.2K",[622,2102,2103],{"align":605},"4.31µs",[597,2105,2106,2111,2114],{},[622,2107,2108],{},[578,2109,2110],{},"parseError()",[622,2112,2113],{"align":605},"45.48M",[622,2115,1507],{"align":605},[597,2117,2118,2121,2124],{},[622,2119,2120],{},"Round-trip (create + parse)",[622,2122,2123],{"align":605},"231.4K",[622,2125,2126],{"align":605},"4.32µs",[583,2128,2130],{"id":2129},"middleware-pipeline","Middleware pipeline",[591,2132,2133,2143],{},[594,2134,2135],{},[597,2136,2137,2139,2141],{},[600,2138,1693],{},[600,2140,1696],{"align":605},[600,2142,1699],{"align":605},[617,2144,2145,2159,2172,2186,2199,2210],{},[597,2146,2147,2153,2156],{},[622,2148,2149,2152],{},[578,2150,2151],{},"resolveMiddlewarePluginRunner"," (no plugins)",[622,2154,2155],{"align":605},"37.70M",[622,2157,2158],{"align":605},"27ns",[597,2160,2161,2166,2169],{},[622,2162,2163,2165],{},[578,2164,2151],{}," (2 plugins, cached)",[622,2167,2168],{"align":605},"32.26M",[622,2170,2171],{"align":605},"31ns",[597,2173,2174,2180,2183],{},[622,2175,2176,2179],{},[578,2177,2178],{},"createMiddlewareLogger"," (no plugins, safe headers)",[622,2181,2182],{"align":605},"4.41M",[622,2184,2185],{"align":605},"227ns",[597,2187,2188,2193,2196],{},[622,2189,2190,2192],{},[578,2191,2178],{}," (2 plugins, cached merge)",[622,2194,2195],{"align":605},"4.13M",[622,2197,2198],{"align":605},"242ns",[597,2200,2201,2204,2207],{},[622,2202,2203],{},"Full request lifecycle (no plugins, no drain)",[622,2205,2206],{"align":605},"993.7K",[622,2208,2209],{"align":605},"1.01µs",[597,2211,2212,2215,2218],{},[622,2213,2214],{},"Full request lifecycle (2 plugins, sync drain)",[622,2216,2217],{"align":605},"621.2K",[622,2219,2220],{"align":605},"1.61µs",[570,2222,2224],{"id":2223},"methodology-trust","Methodology & trust",[583,2226,2228],{"id":2227},"can-you-trust-these-numbers","Can you trust these numbers?",[553,2230,2231,2232,2235,2236,2239,2240,2247],{},"Every benchmark in this page is ",[557,2233,2234],{},"open source"," and ",[557,2237,2238],{},"reproducible",". The benchmark files live in ",[562,2241,2244],{"href":2242,"rel":2243},"https:\u002F\u002Fgithub.com\u002Fhugorcd\u002Fevlog\u002Ftree\u002Fmain\u002Fpackages\u002Fevlog\u002Fbench",[566],[578,2245,2246],{},"packages\u002Fevlog\u002Fbench\u002F",". You can read the exact code, run it on your machine, and verify the results.",[553,2249,2250],{},"All libraries are tested under the same conditions:",[2252,2253,2254,2261,2267,2284],"ul",{},[2255,2256,2257,2260],"li",{},[557,2258,2259],{},"Same output mode",": JSON to a no-op destination (no disk or network I\u002FO measured)",[2255,2262,2263,2266],{},[557,2264,2265],{},"Same warmup",": each benchmark runs for 500ms after JIT stabilization",[2255,2268,2269,2272,2273,2278,2279],{},[557,2270,2271],{},"Same tooling",": ",[562,2274,2277],{"href":2275,"rel":2276},"https:\u002F\u002Fvitest.dev\u002Fguide\u002Ffeatures#benchmarking",[566],"Vitest bench"," powered by ",[562,2280,2283],{"href":2281,"rel":2282},"https:\u002F\u002Fgithub.com\u002Ftinylibs\u002Ftinybench",[566],"tinybench",[2255,2285,2286,2289],{},[557,2287,2288],{},"Same machine",": when comparing libraries, all benchmarks run in the same process on the same hardware",[583,2291,2293],{"id":2292},"ci-regression-tracking","CI regression tracking",[553,2295,2296],{},"Performance regressions are tracked on every pull request via two systems:",[2252,2298,2299,2307],{},[2255,2300,2301,2306],{},[557,2302,2303],{},[562,2304,567],{"href":564,"rel":2305},[566]," runs all benchmarks using CPU instruction counting (not wall-clock timing). This eliminates noise from shared CI runners and produces deterministic, reproducible results. Regressions are flagged directly on the PR.",[2255,2308,2309,2312,2313,2315],{},[557,2310,2311],{},"Bundle size comparison"," measures all entry points against the ",[578,2314,1676],{}," baseline and posts a size delta report as a PR comment.",[583,2317,2319],{"id":2318},"run-it-yourself","Run it yourself",[797,2321,2326],{"className":2322,"code":2323,"filename":2324,"language":2325,"meta":803,"style":803},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","cd packages\u002Fevlog\n\npnpm run bench                          # all benchmarks\npnpm exec vitest bench bench\u002Fcomparison\u002F # vs alternatives only\npnpm exec tsx bench\u002Fscripts\u002Fsize.ts     # bundle size\n","Terminal","bash",[578,2327,2328,2336,2342,2358,2376],{"__ignoreMap":803},[807,2329,2330,2333],{"class":809,"line":810},[807,2331,2332],{"class":825},"cd",[807,2334,2335],{"class":845}," packages\u002Fevlog\n",[807,2337,2338],{"class":809,"line":887},[807,2339,2341],{"emptyLinePlaceholder":2340},true,"\n",[807,2343,2344,2348,2351,2354],{"class":809,"line":942},[807,2345,2347],{"class":2346},"sBMFI","pnpm",[807,2349,2350],{"class":845}," run",[807,2352,2353],{"class":845}," bench",[807,2355,2357],{"class":2356},"sHwdD","                          # all benchmarks\n",[807,2359,2360,2362,2365,2368,2370,2373],{"class":809,"line":987},[807,2361,2347],{"class":2346},[807,2363,2364],{"class":845}," exec",[807,2366,2367],{"class":845}," vitest",[807,2369,2353],{"class":845},[807,2371,2372],{"class":845}," bench\u002Fcomparison\u002F",[807,2374,2375],{"class":2356}," # vs alternatives only\n",[807,2377,2378,2380,2382,2385,2388],{"class":809,"line":1038},[807,2379,2347],{"class":2346},[807,2381,2364],{"class":845},[807,2383,2384],{"class":845}," tsx",[807,2386,2387],{"class":845}," bench\u002Fscripts\u002Fsize.ts",[807,2389,2390],{"class":2356},"     # bundle size\n",[2392,2393,2394],"style",{},"html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .sBMFI, html code.shiki .sBMFI{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}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":803,"searchDepth":887,"depth":887,"links":2396},[2397,2401,2402,2403,2404,2405,2417],{"id":572,"depth":887,"text":573,"children":2398},[2399,2400],{"id":585,"depth":942,"text":586},{"id":788,"depth":942,"text":789},{"id":1313,"depth":887,"text":1314},{"id":1374,"depth":887,"text":784},{"id":1453,"depth":887,"text":1454},{"id":1536,"depth":887,"text":1537},{"id":1680,"depth":887,"text":1681,"children":2406},[2407,2408,2410,2412,2413,2414,2415,2416],{"id":1684,"depth":942,"text":739},{"id":1770,"depth":942,"text":2409},"Context accumulation (log.set())",{"id":1833,"depth":942,"text":2411},"Event emission (log.emit())",{"id":1908,"depth":942,"text":1909},{"id":1960,"depth":942,"text":175},{"id":1597,"depth":942,"text":532},{"id":2075,"depth":942,"text":2076},{"id":2129,"depth":942,"text":2130},{"id":2223,"depth":887,"text":2224,"children":2418},[2419,2420,2421],{"id":2227,"depth":942,"text":2228},{"id":2292,"depth":942,"text":2293},{"id":2318,"depth":942,"text":2319},"evlog adds ~3µs per request. Faster than pino, consola, and winston in most scenarios while emitting richer, more useful events.","md",[2425,2428],{"label":175,"icon":178,"to":176,"color":2426,"variant":2427},"neutral","subtle",{"label":170,"icon":173,"to":171,"color":2426,"variant":2427},{},{"icon":126},{"title":123,"description":2422},"cTc2EX2uoRPLQJ8aU7jFpOt5qbEDCR_pi7h_qOOCbLk",[2434,2436],{"title":185,"path":186,"stem":187,"description":2435,"icon":129,"children":-1},"Security guidelines, data sanitization, and production tips for evlog. Learn what not to log and how to protect sensitive data.",{"title":192,"path":193,"stem":194,"description":2437,"icon":195,"children":-1},"Build-time optimizations for any Vite-based framework. Auto-init, debug stripping, source location injection, and optional auto-imports.",1778338237930]