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LogTape","\u002Fcompare\u002Flogtape","9.compare\u002F3.logtape",{"title":605,"path":606,"stem":607,"icon":577},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","9.compare\u002F4.winston",{"title":609,"path":610,"stem":611,"icon":577},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","9.compare\u002F5.consola",{"id":613,"title":614,"body":615,"description":2239,"extension":2240,"links":2241,"meta":2250,"navigation":2251,"path":217,"seo":2252,"stem":218,"__hash__":2253},"docs\u002F4.integrate\u002Fadapters\u002Fself-hosted\u002F01.fs.md","File System Adapter",{"type":616,"value":617,"toc":2219},"minimark",[618,622,654,700,704,707,750,753,756,1351,1357,1361,1370,1377,1394,1397,1401,1504,1508,1667,1671,1681,1688,1692,1701,1705,1708,1867,1871,1875,1894,1898,1981,1985,2038,2042,2045,2172,2176,2186,2190,2215],[619,620,621],"p",{},"The File System adapter writes your wide events to local NDJSON files (one JSON object per line, one file per day). This enables:",[623,624,625,638,648],"ul",{},[626,627,628,632,633,637],"li",{},[629,630,631],"strong",{},"AI agent integration"," - point a skill to ",[634,635,636],"code",{},".evlog\u002Flogs\u002F"," to parse structured logs for debugging and pattern analysis",[626,639,640,643,644,647],{},[629,641,642],{},"Local dev debugging"," - persistent log history without scrolling the terminal (",[634,645,646],{},"tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl",")",[626,649,650,653],{},[629,651,652],{},"Production backup"," - combine with a network drain (Axiom, OTLP) for local fallback",[655,656,659,662,686],"prompt",{":actions":657,"description":658,"icon":219},"[\"copy\",\"cursor\",\"claude\"]","Add the file system drain adapter",[619,660,661],{},"Add the file system drain adapter to write evlog wide events locally as NDJSON files.",[663,664,665,668,671,674,677,680,683],"ol",{},[626,666,667],{},"Identify which framework I'm using and follow its evlog integration pattern",[626,669,670],{},"Install evlog if not already installed",[626,672,673],{},"Import createFsDrain from 'evlog\u002Ffs'",[626,675,676],{},"Wire createFsDrain() into my framework's drain configuration",[626,678,679],{},"Logs are written to .evlog\u002Flogs\u002F by default (one file per day, auto .gitignore)",[626,681,682],{},"Optionally configure dir, maxFiles, maxSizePerFile, or pretty options",[626,684,685],{},"Test by triggering a request and checking .evlog\u002Flogs\u002F*.jsonl",[619,687,688,689,695,696],{},"Adapter docs: ",[690,691,692],"a",{"href":692,"rel":693},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Fself-hosted\u002Ffs",[694],"nofollow","\nFramework setup: ",[690,697,698],{"href":698,"rel":699},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Foverview",[694],[701,702,20],"h2",{"id":703},"installation",[619,705,706],{},"The File System adapter comes bundled with evlog:",[708,709,715],"pre",{"className":710,"code":711,"filename":712,"language":713,"meta":714,"style":714},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { createFsDrain } from 'evlog\u002Ffs'\n","src\u002Findex.ts","typescript","",[634,716,717],{"__ignoreMap":714},[718,719,722,726,730,734,737,740,743,747],"span",{"class":720,"line":721},"line",1,[718,723,725],{"class":724},"s7zQu","import",[718,727,729],{"class":728},"sMK4o"," {",[718,731,733],{"class":732},"sTEyZ"," createFsDrain",[718,735,736],{"class":728}," }",[718,738,739],{"class":724}," from",[718,741,742],{"class":728}," '",[718,744,746],{"class":745},"sfazB","evlog\u002Ffs",[718,748,749],{"class":728},"'\n",[701,751,25],{"id":752},"quick-start",[619,754,755],{},"No credentials or environment variables needed. Just wire the drain to your framework:",[757,758,759,873,1004,1021,1083,1137,1196,1250,1303],"code-group",{},[708,760,763],{"className":710,"code":761,"filename":762,"language":713,"meta":714,"style":714},"\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\nimport { createFsDrain } from 'evlog\u002Ffs'\n\nexport default defineNitroPlugin((nitroApp) => {\n  nitroApp.hooks.hook('evlog:drain', createFsDrain())\n})\n","Nuxt \u002F Nitro",[634,764,765,771,790,797,828,864],{"__ignoreMap":714},[718,766,767],{"class":720,"line":721},[718,768,770],{"class":769},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\n",[718,772,774,776,778,780,782,784,786,788],{"class":720,"line":773},2,[718,775,725],{"class":724},[718,777,729],{"class":728},[718,779,733],{"class":732},[718,781,736],{"class":728},[718,783,739],{"class":724},[718,785,742],{"class":728},[718,787,746],{"class":745},[718,789,749],{"class":728},[718,791,793],{"class":720,"line":792},3,[718,794,796],{"emptyLinePlaceholder":795},true,"\n",[718,798,800,803,806,810,813,815,819,821,825],{"class":720,"line":799},4,[718,801,802],{"class":724},"export",[718,804,805],{"class":724}," default",[718,807,809],{"class":808},"s2Zo4"," defineNitroPlugin",[718,811,812],{"class":732},"(",[718,814,812],{"class":728},[718,816,818],{"class":817},"sHdIc","nitroApp",[718,820,647],{"class":728},[718,822,824],{"class":823},"spNyl"," =>",[718,826,827],{"class":728}," {\n",[718,829,831,834,837,840,842,845,848,851,854,856,859,861],{"class":720,"line":830},5,[718,832,833],{"class":732},"  nitroApp",[718,835,836],{"class":728},".",[718,838,839],{"class":732},"hooks",[718,841,836],{"class":728},[718,843,844],{"class":808},"hook",[718,846,812],{"class":847},"swJcz",[718,849,850],{"class":728},"'",[718,852,853],{"class":745},"evlog:drain",[718,855,850],{"class":728},[718,857,858],{"class":728},",",[718,860,733],{"class":808},[718,862,863],{"class":847},"())\n",[718,865,867,870],{"class":720,"line":866},6,[718,868,869],{"class":728},"}",[718,871,872],{"class":732},")\n",[708,874,876],{"className":710,"code":875,"filename":245,"language":713,"meta":714,"style":714},"\u002F\u002F lib\u002Fevlog.ts — Node.js routes only; keep evlog\u002Ffs out of root instrumentation.ts\nimport { createEvlog } from 'evlog\u002Fnext'\nimport { createFsDrain } from 'evlog\u002Ffs'\n\nexport const { withEvlog, useLogger, log, createError } = createEvlog({\n  service: 'my-app',\n  drain: createFsDrain(),\n})\n",[634,877,878,883,903,921,925,964,982,997],{"__ignoreMap":714},[718,879,880],{"class":720,"line":721},[718,881,882],{"class":769},"\u002F\u002F lib\u002Fevlog.ts — Node.js routes only; keep evlog\u002Ffs out of root instrumentation.ts\n",[718,884,885,887,889,892,894,896,898,901],{"class":720,"line":773},[718,886,725],{"class":724},[718,888,729],{"class":728},[718,890,891],{"class":732}," createEvlog",[718,893,736],{"class":728},[718,895,739],{"class":724},[718,897,742],{"class":728},[718,899,900],{"class":745},"evlog\u002Fnext",[718,902,749],{"class":728},[718,904,905,907,909,911,913,915,917,919],{"class":720,"line":792},[718,906,725],{"class":724},[718,908,729],{"class":728},[718,910,733],{"class":732},[718,912,736],{"class":728},[718,914,739],{"class":724},[718,916,742],{"class":728},[718,918,746],{"class":745},[718,920,749],{"class":728},[718,922,923],{"class":720,"line":799},[718,924,796],{"emptyLinePlaceholder":795},[718,926,927,929,932,934,937,939,942,944,947,949,952,954,957,959,961],{"class":720,"line":830},[718,928,802],{"class":724},[718,930,931],{"class":823}," const",[718,933,729],{"class":728},[718,935,936],{"class":732}," withEvlog",[718,938,858],{"class":728},[718,940,941],{"class":732}," useLogger",[718,943,858],{"class":728},[718,945,946],{"class":732}," log",[718,948,858],{"class":728},[718,950,951],{"class":732}," createError ",[718,953,869],{"class":728},[718,955,956],{"class":728}," =",[718,958,891],{"class":808},[718,960,812],{"class":732},[718,962,963],{"class":728},"{\n",[718,965,966,969,972,974,977,979],{"class":720,"line":866},[718,967,968],{"class":847},"  service",[718,970,971],{"class":728},":",[718,973,742],{"class":728},[718,975,976],{"class":745},"my-app",[718,978,850],{"class":728},[718,980,981],{"class":728},",\n",[718,983,985,988,990,992,995],{"class":720,"line":984},7,[718,986,987],{"class":847},"  drain",[718,989,971],{"class":728},[718,991,733],{"class":808},[718,993,994],{"class":732},"()",[718,996,981],{"class":728},[718,998,1000,1002],{"class":720,"line":999},8,[718,1001,869],{"class":728},[718,1003,872],{"class":732},[1005,1006,1008,1009,1012,1013,1016,1017,1020],"callout",{"color":1007,"icon":13},"info","The FS adapter requires Node.js (",[634,1010,1011],{},"node:fs","). On the Edge runtime, or when its directory is not writable, it logs a one-time ",[634,1014,1015],{},"[evlog\u002Ffs]"," warning and skips writes, so attaching it on a serverless host is safe but pointless, since only the temp directory is writable there and it does not outlive the instance. Use ",[634,1018,1019],{},"evlog\u002Fmemory"," or an HTTP adapter for those.",[708,1022,1024],{"className":710,"code":1023,"filename":275,"language":713,"meta":714,"style":714},"import { createFsDrain } from 'evlog\u002Ffs'\n\napp.use(evlog({ drain: createFsDrain() }))\n",[634,1025,1026,1044,1048],{"__ignoreMap":714},[718,1027,1028,1030,1032,1034,1036,1038,1040,1042],{"class":720,"line":721},[718,1029,725],{"class":724},[718,1031,729],{"class":728},[718,1033,733],{"class":732},[718,1035,736],{"class":728},[718,1037,739],{"class":724},[718,1039,742],{"class":728},[718,1041,746],{"class":745},[718,1043,749],{"class":728},[718,1045,1046],{"class":720,"line":773},[718,1047,796],{"emptyLinePlaceholder":795},[718,1049,1050,1053,1055,1058,1060,1063,1065,1068,1071,1073,1075,1078,1080],{"class":720,"line":792},[718,1051,1052],{"class":732},"app",[718,1054,836],{"class":728},[718,1056,1057],{"class":808},"use",[718,1059,812],{"class":732},[718,1061,1062],{"class":808},"evlog",[718,1064,812],{"class":732},[718,1066,1067],{"class":728},"{",[718,1069,1070],{"class":847}," drain",[718,1072,971],{"class":728},[718,1074,733],{"class":808},[718,1076,1077],{"class":732},"() ",[718,1079,869],{"class":728},[718,1081,1082],{"class":732},"))\n",[708,1084,1085],{"className":710,"code":1023,"filename":270,"language":713,"meta":714,"style":714},[634,1086,1087,1105,1109],{"__ignoreMap":714},[718,1088,1089,1091,1093,1095,1097,1099,1101,1103],{"class":720,"line":721},[718,1090,725],{"class":724},[718,1092,729],{"class":728},[718,1094,733],{"class":732},[718,1096,736],{"class":728},[718,1098,739],{"class":724},[718,1100,742],{"class":728},[718,1102,746],{"class":745},[718,1104,749],{"class":728},[718,1106,1107],{"class":720,"line":773},[718,1108,796],{"emptyLinePlaceholder":795},[718,1110,1111,1113,1115,1117,1119,1121,1123,1125,1127,1129,1131,1133,1135],{"class":720,"line":792},[718,1112,1052],{"class":732},[718,1114,836],{"class":728},[718,1116,1057],{"class":808},[718,1118,812],{"class":732},[718,1120,1062],{"class":808},[718,1122,812],{"class":732},[718,1124,1067],{"class":728},[718,1126,1070],{"class":847},[718,1128,971],{"class":728},[718,1130,733],{"class":808},[718,1132,1077],{"class":732},[718,1134,869],{"class":728},[718,1136,1082],{"class":732},[708,1138,1140],{"className":710,"code":1139,"filename":280,"language":713,"meta":714,"style":714},"import { createFsDrain } from 'evlog\u002Ffs'\n\nawait app.register(evlog, { drain: createFsDrain() })\n",[634,1141,1142,1160,1164],{"__ignoreMap":714},[718,1143,1144,1146,1148,1150,1152,1154,1156,1158],{"class":720,"line":721},[718,1145,725],{"class":724},[718,1147,729],{"class":728},[718,1149,733],{"class":732},[718,1151,736],{"class":728},[718,1153,739],{"class":724},[718,1155,742],{"class":728},[718,1157,746],{"class":745},[718,1159,749],{"class":728},[718,1161,1162],{"class":720,"line":773},[718,1163,796],{"emptyLinePlaceholder":795},[718,1165,1166,1169,1172,1174,1177,1180,1182,1184,1186,1188,1190,1192,1194],{"class":720,"line":792},[718,1167,1168],{"class":724},"await",[718,1170,1171],{"class":732}," app",[718,1173,836],{"class":728},[718,1175,1176],{"class":808},"register",[718,1178,1179],{"class":732},"(evlog",[718,1181,858],{"class":728},[718,1183,729],{"class":728},[718,1185,1070],{"class":847},[718,1187,971],{"class":728},[718,1189,733],{"class":808},[718,1191,1077],{"class":732},[718,1193,869],{"class":728},[718,1195,872],{"class":732},[708,1197,1198],{"className":710,"code":1023,"filename":285,"language":713,"meta":714,"style":714},[634,1199,1200,1218,1222],{"__ignoreMap":714},[718,1201,1202,1204,1206,1208,1210,1212,1214,1216],{"class":720,"line":721},[718,1203,725],{"class":724},[718,1205,729],{"class":728},[718,1207,733],{"class":732},[718,1209,736],{"class":728},[718,1211,739],{"class":724},[718,1213,742],{"class":728},[718,1215,746],{"class":745},[718,1217,749],{"class":728},[718,1219,1220],{"class":720,"line":773},[718,1221,796],{"emptyLinePlaceholder":795},[718,1223,1224,1226,1228,1230,1232,1234,1236,1238,1240,1242,1244,1246,1248],{"class":720,"line":792},[718,1225,1052],{"class":732},[718,1227,836],{"class":728},[718,1229,1057],{"class":808},[718,1231,812],{"class":732},[718,1233,1062],{"class":808},[718,1235,812],{"class":732},[718,1237,1067],{"class":728},[718,1239,1070],{"class":847},[718,1241,971],{"class":728},[718,1243,733],{"class":808},[718,1245,1077],{"class":732},[718,1247,869],{"class":728},[718,1249,1082],{"class":732},[708,1251,1253],{"className":710,"code":1252,"filename":265,"language":713,"meta":714,"style":714},"import { createFsDrain } from 'evlog\u002Ffs'\n\nEvlogModule.forRoot({ drain: createFsDrain() })\n",[634,1254,1255,1273,1277],{"__ignoreMap":714},[718,1256,1257,1259,1261,1263,1265,1267,1269,1271],{"class":720,"line":721},[718,1258,725],{"class":724},[718,1260,729],{"class":728},[718,1262,733],{"class":732},[718,1264,736],{"class":728},[718,1266,739],{"class":724},[718,1268,742],{"class":728},[718,1270,746],{"class":745},[718,1272,749],{"class":728},[718,1274,1275],{"class":720,"line":773},[718,1276,796],{"emptyLinePlaceholder":795},[718,1278,1279,1282,1284,1287,1289,1291,1293,1295,1297,1299,1301],{"class":720,"line":792},[718,1280,1281],{"class":732},"EvlogModule",[718,1283,836],{"class":728},[718,1285,1286],{"class":808},"forRoot",[718,1288,812],{"class":732},[718,1290,1067],{"class":728},[718,1292,1070],{"class":847},[718,1294,971],{"class":728},[718,1296,733],{"class":808},[718,1298,1077],{"class":732},[718,1300,869],{"class":728},[718,1302,872],{"class":732},[708,1304,1306],{"className":710,"code":1305,"filename":300,"language":713,"meta":714,"style":714},"import { createFsDrain } from 'evlog\u002Ffs'\n\ninitLogger({ drain: createFsDrain() })\n",[634,1307,1308,1326,1330],{"__ignoreMap":714},[718,1309,1310,1312,1314,1316,1318,1320,1322,1324],{"class":720,"line":721},[718,1311,725],{"class":724},[718,1313,729],{"class":728},[718,1315,733],{"class":732},[718,1317,736],{"class":728},[718,1319,739],{"class":724},[718,1321,742],{"class":728},[718,1323,746],{"class":745},[718,1325,749],{"class":728},[718,1327,1328],{"class":720,"line":773},[718,1329,796],{"emptyLinePlaceholder":795},[718,1331,1332,1335,1337,1339,1341,1343,1345,1347,1349],{"class":720,"line":792},[718,1333,1334],{"class":808},"initLogger",[718,1336,812],{"class":732},[718,1338,1067],{"class":728},[718,1340,1070],{"class":847},[718,1342,971],{"class":728},[718,1344,733],{"class":808},[718,1346,1077],{"class":732},[718,1348,869],{"class":728},[718,1350,872],{"class":732},[619,1352,1353,1354,1356],{},"Logs start appearing in ",[634,1355,636],{}," immediately.",[701,1358,1360],{"id":1359},"where-the-files-land","Where the files land",[708,1362,1368],{"className":1363,"code":1365,"filename":1366,"language":1367,"meta":714},[1364],"language-text",".evlog\u002F\n  logs\u002F\n    2026-03-14.jsonl    ← one file per day\n    2026-03-13.jsonl\n    2026-03-12.jsonl\n",".evlog\u002Flogs directory layout","text",[634,1369,1365],{"__ignoreMap":714},[619,1371,1372,1373,1376],{},"Each ",[634,1374,1375],{},".jsonl"," file contains one JSON object per line (NDJSON format), making it easy to parse, grep, and stream.",[1005,1378,1381,1382,1385,1386,1389,1390,1393],{"color":1379,"icon":1380},"success","i-lucide-git-branch","A ",[634,1383,1384],{},".gitignore"," is automatically created on first write, inside the ",[634,1387,1388],{},".evlog\u002F"," ancestor directory when present or in the configured ",[634,1391,1392],{},"dir"," otherwise. Log files are never committed to version control.",[701,1395,557],{"id":1396},"configuration",[1398,1399,346],"h3",{"id":1400},"options",[1402,1403,1404,1423],"table",{},[1405,1406,1407],"thead",{},[1408,1409,1410,1414,1417,1420],"tr",{},[1411,1412,1413],"th",{},"Option",[1411,1415,1416],{},"Type",[1411,1418,1419],{},"Default",[1411,1421,1422],{},"Description",[1424,1425,1426,1446,1466,1484],"tbody",{},[1408,1427,1428,1433,1438,1443],{},[1429,1430,1431],"td",{},[634,1432,1392],{},[1429,1434,1435],{},[634,1436,1437],{},"string",[1429,1439,1440],{},[634,1441,1442],{},"'.evlog\u002Flogs'",[1429,1444,1445],{},"Directory for log files",[1408,1447,1448,1453,1458,1463],{},[1429,1449,1450],{},[634,1451,1452],{},"maxFiles",[1429,1454,1455],{},[634,1456,1457],{},"number",[1429,1459,1460],{},[634,1461,1462],{},"undefined",[1429,1464,1465],{},"Max files to keep (auto-deletes oldest)",[1408,1467,1468,1473,1477,1481],{},[1429,1469,1470],{},[634,1471,1472],{},"maxSizePerFile",[1429,1474,1475],{},[634,1476,1457],{},[1429,1478,1479],{},[634,1480,1462],{},[1429,1482,1483],{},"Max bytes per file before rotating",[1408,1485,1486,1491,1496,1501],{},[1429,1487,1488],{},[634,1489,1490],{},"pretty",[1429,1492,1493],{},[634,1494,1495],{},"boolean",[1429,1497,1498],{},[634,1499,1500],{},"false",[1429,1502,1503],{},"Pretty-print JSON (multi-line, readable)",[1398,1505,1507],{"id":1506},"examples","Examples",[708,1509,1512],{"className":710,"code":1510,"filename":1511,"language":713,"meta":714,"style":714},"\u002F\u002F Keep only the last 7 days of logs\ncreateFsDrain({ maxFiles: 7 })\n\n\u002F\u002F Rotate files at 10MB, keep 30 files\ncreateFsDrain({\n  maxSizePerFile: 10 * 1024 * 1024,\n  maxFiles: 30,\n})\n\n\u002F\u002F Pretty-print for human reading\ncreateFsDrain({ pretty: true })\n\n\u002F\u002F Custom directory\ncreateFsDrain({ dir: '\u002Fvar\u002Flog\u002Fmyapp' })\n","server\u002Fplugins\u002Fevlog-drain.ts",[634,1513,1514,1519,1541,1545,1550,1558,1580,1592,1598,1603,1609,1631,1636,1642],{"__ignoreMap":714},[718,1515,1516],{"class":720,"line":721},[718,1517,1518],{"class":769},"\u002F\u002F Keep only the last 7 days of logs\n",[718,1520,1521,1524,1526,1528,1531,1533,1537,1539],{"class":720,"line":773},[718,1522,1523],{"class":808},"createFsDrain",[718,1525,812],{"class":732},[718,1527,1067],{"class":728},[718,1529,1530],{"class":847}," maxFiles",[718,1532,971],{"class":728},[718,1534,1536],{"class":1535},"sbssI"," 7",[718,1538,736],{"class":728},[718,1540,872],{"class":732},[718,1542,1543],{"class":720,"line":792},[718,1544,796],{"emptyLinePlaceholder":795},[718,1546,1547],{"class":720,"line":799},[718,1548,1549],{"class":769},"\u002F\u002F Rotate files at 10MB, keep 30 files\n",[718,1551,1552,1554,1556],{"class":720,"line":830},[718,1553,1523],{"class":808},[718,1555,812],{"class":732},[718,1557,963],{"class":728},[718,1559,1560,1563,1565,1568,1571,1574,1576,1578],{"class":720,"line":866},[718,1561,1562],{"class":847},"  maxSizePerFile",[718,1564,971],{"class":728},[718,1566,1567],{"class":1535}," 10",[718,1569,1570],{"class":728}," *",[718,1572,1573],{"class":1535}," 1024",[718,1575,1570],{"class":728},[718,1577,1573],{"class":1535},[718,1579,981],{"class":728},[718,1581,1582,1585,1587,1590],{"class":720,"line":984},[718,1583,1584],{"class":847},"  maxFiles",[718,1586,971],{"class":728},[718,1588,1589],{"class":1535}," 30",[718,1591,981],{"class":728},[718,1593,1594,1596],{"class":720,"line":999},[718,1595,869],{"class":728},[718,1597,872],{"class":732},[718,1599,1601],{"class":720,"line":1600},9,[718,1602,796],{"emptyLinePlaceholder":795},[718,1604,1606],{"class":720,"line":1605},10,[718,1607,1608],{"class":769},"\u002F\u002F Pretty-print for human reading\n",[718,1610,1612,1614,1616,1618,1621,1623,1627,1629],{"class":720,"line":1611},11,[718,1613,1523],{"class":808},[718,1615,812],{"class":732},[718,1617,1067],{"class":728},[718,1619,1620],{"class":847}," pretty",[718,1622,971],{"class":728},[718,1624,1626],{"class":1625},"sfNiH"," true",[718,1628,736],{"class":728},[718,1630,872],{"class":732},[718,1632,1634],{"class":720,"line":1633},12,[718,1635,796],{"emptyLinePlaceholder":795},[718,1637,1639],{"class":720,"line":1638},13,[718,1640,1641],{"class":769},"\u002F\u002F Custom directory\n",[718,1643,1645,1647,1649,1651,1654,1656,1658,1661,1663,1665],{"class":720,"line":1644},14,[718,1646,1523],{"class":808},[718,1648,812],{"class":732},[718,1650,1067],{"class":728},[718,1652,1653],{"class":847}," dir",[718,1655,971],{"class":728},[718,1657,742],{"class":728},[718,1659,1660],{"class":745},"\u002Fvar\u002Flog\u002Fmyapp",[718,1662,850],{"class":728},[718,1664,736],{"class":728},[718,1666,872],{"class":732},[1398,1668,1670],{"id":1669},"rotate-by-size-or-by-day","Rotate by size or by day",[619,1672,1673,1674,1677,1678,1680],{},"By default, a new file is created each day (",[634,1675,1676],{},"2026-03-14.jsonl","). When ",[634,1679,1472],{}," is set, the adapter creates suffixed files when the current file exceeds the limit:",[708,1682,1686],{"className":1683,"code":1684,"filename":1685,"language":1367,"meta":714},[1364],".evlog\u002Flogs\u002F\n  2026-03-14.jsonl      ← base file (full)\n  2026-03-14.1.jsonl    ← first rotation\n  2026-03-14.2.jsonl    ← second rotation\n","Rotated log files",[634,1687,1684],{"__ignoreMap":714},[1398,1689,1691],{"id":1690},"delete-old-files-on-a-schedule","Delete old files on a schedule",[619,1693,1694,1695,1697,1698,1700],{},"When ",[634,1696,1452],{}," is set, the adapter automatically deletes the oldest ",[634,1699,1375],{}," files after each write, keeping only the most recent files.",[701,1702,1704],{"id":1703},"write-to-disk-and-ship-to-a-service","Write to disk and ship to a service",[619,1706,1707],{},"Use the FS adapter alongside a network drain for local backup:",[708,1709,1711],{"className":710,"code":1710,"filename":1511,"language":713,"meta":714,"style":714},"import { createFsDrain } from 'evlog\u002Ffs'\nimport { createAxiomDrain } from 'evlog\u002Faxiom'\n\nconst fs = createFsDrain({ maxFiles: 7 })\nconst axiom = createAxiomDrain()\n\nconst drain = async (ctx) => {\n  await Promise.allSettled([fs(ctx), axiom(ctx)])\n}\n",[634,1712,1713,1731,1751,1755,1782,1796,1800,1824,1862],{"__ignoreMap":714},[718,1714,1715,1717,1719,1721,1723,1725,1727,1729],{"class":720,"line":721},[718,1716,725],{"class":724},[718,1718,729],{"class":728},[718,1720,733],{"class":732},[718,1722,736],{"class":728},[718,1724,739],{"class":724},[718,1726,742],{"class":728},[718,1728,746],{"class":745},[718,1730,749],{"class":728},[718,1732,1733,1735,1737,1740,1742,1744,1746,1749],{"class":720,"line":773},[718,1734,725],{"class":724},[718,1736,729],{"class":728},[718,1738,1739],{"class":732}," createAxiomDrain",[718,1741,736],{"class":728},[718,1743,739],{"class":724},[718,1745,742],{"class":728},[718,1747,1748],{"class":745},"evlog\u002Faxiom",[718,1750,749],{"class":728},[718,1752,1753],{"class":720,"line":792},[718,1754,796],{"emptyLinePlaceholder":795},[718,1756,1757,1760,1763,1766,1768,1770,1772,1774,1776,1778,1780],{"class":720,"line":799},[718,1758,1759],{"class":823},"const",[718,1761,1762],{"class":732}," fs ",[718,1764,1765],{"class":728},"=",[718,1767,733],{"class":808},[718,1769,812],{"class":732},[718,1771,1067],{"class":728},[718,1773,1530],{"class":847},[718,1775,971],{"class":728},[718,1777,1536],{"class":1535},[718,1779,736],{"class":728},[718,1781,872],{"class":732},[718,1783,1784,1786,1789,1791,1793],{"class":720,"line":830},[718,1785,1759],{"class":823},[718,1787,1788],{"class":732}," axiom ",[718,1790,1765],{"class":728},[718,1792,1739],{"class":808},[718,1794,1795],{"class":732},"()\n",[718,1797,1798],{"class":720,"line":866},[718,1799,796],{"emptyLinePlaceholder":795},[718,1801,1802,1804,1807,1809,1812,1815,1818,1820,1822],{"class":720,"line":984},[718,1803,1759],{"class":823},[718,1805,1806],{"class":732}," drain ",[718,1808,1765],{"class":728},[718,1810,1811],{"class":823}," async",[718,1813,1814],{"class":728}," (",[718,1816,1817],{"class":817},"ctx",[718,1819,647],{"class":728},[718,1821,824],{"class":823},[718,1823,827],{"class":728},[718,1825,1826,1829,1833,1835,1838,1841,1844,1846,1848,1850,1852,1855,1857,1859],{"class":720,"line":999},[718,1827,1828],{"class":724},"  await",[718,1830,1832],{"class":1831},"sBMFI"," Promise",[718,1834,836],{"class":728},[718,1836,1837],{"class":808},"allSettled",[718,1839,1840],{"class":847},"([",[718,1842,1843],{"class":808},"fs",[718,1845,812],{"class":847},[718,1847,1817],{"class":732},[718,1849,647],{"class":847},[718,1851,858],{"class":728},[718,1853,1854],{"class":808}," axiom",[718,1856,812],{"class":847},[718,1858,1817],{"class":732},[718,1860,1861],{"class":847},")])\n",[718,1863,1864],{"class":720,"line":1600},[718,1865,1866],{"class":728},"}\n",[701,1868,1870],{"id":1869},"read-back-what-you-wrote","Read back what you wrote",[1398,1872,1874],{"id":1873},"stream-in-real-time","Stream in real-time",[708,1876,1881],{"className":1877,"code":1878,"filename":1879,"language":1880,"meta":714,"style":714},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl\n","Terminal","bash",[634,1882,1883],{"__ignoreMap":714},[718,1884,1885,1888,1891],{"class":720,"line":721},[718,1886,1887],{"class":1831},"tail",[718,1889,1890],{"class":745}," -f",[718,1892,1893],{"class":745}," .evlog\u002Flogs\u002F2026-03-14.jsonl\n",[1398,1895,1897],{"id":1896},"search-with-jq","Search with jq",[708,1899,1901],{"className":1877,"code":1900,"filename":1879,"language":1880,"meta":714,"style":714},"# Find errors\ncat .evlog\u002Flogs\u002F2026-03-14.jsonl | jq 'select(.level == \"error\")'\n\n# Slow requests (over 1s)\ncat .evlog\u002Flogs\u002F2026-03-14.jsonl | jq 'select(.durationMs > 1000)'\n\n# Requests by path\ncat .evlog\u002Flogs\u002F2026-03-14.jsonl | jq 'select(.path == \"\u002Fapi\u002Fcheckout\")'\n",[634,1902,1903,1908,1929,1933,1938,1955,1959,1964],{"__ignoreMap":714},[718,1904,1905],{"class":720,"line":721},[718,1906,1907],{"class":769},"# Find errors\n",[718,1909,1910,1913,1916,1919,1922,1924,1927],{"class":720,"line":773},[718,1911,1912],{"class":1831},"cat",[718,1914,1915],{"class":745}," .evlog\u002Flogs\u002F2026-03-14.jsonl",[718,1917,1918],{"class":728}," |",[718,1920,1921],{"class":1831}," jq",[718,1923,742],{"class":728},[718,1925,1926],{"class":745},"select(.level == \"error\")",[718,1928,749],{"class":728},[718,1930,1931],{"class":720,"line":792},[718,1932,796],{"emptyLinePlaceholder":795},[718,1934,1935],{"class":720,"line":799},[718,1936,1937],{"class":769},"# Slow requests (over 1s)\n",[718,1939,1940,1942,1944,1946,1948,1950,1953],{"class":720,"line":830},[718,1941,1912],{"class":1831},[718,1943,1915],{"class":745},[718,1945,1918],{"class":728},[718,1947,1921],{"class":1831},[718,1949,742],{"class":728},[718,1951,1952],{"class":745},"select(.durationMs > 1000)",[718,1954,749],{"class":728},[718,1956,1957],{"class":720,"line":866},[718,1958,796],{"emptyLinePlaceholder":795},[718,1960,1961],{"class":720,"line":984},[718,1962,1963],{"class":769},"# Requests by path\n",[718,1965,1966,1968,1970,1972,1974,1976,1979],{"class":720,"line":999},[718,1967,1912],{"class":1831},[718,1969,1915],{"class":745},[718,1971,1918],{"class":728},[718,1973,1921],{"class":1831},[718,1975,742],{"class":728},[718,1977,1978],{"class":745},"select(.path == \"\u002Fapi\u002Fcheckout\")",[718,1980,749],{"class":728},[1398,1982,1984],{"id":1983},"search-with-grep","Search with grep",[708,1986,1988],{"className":1877,"code":1987,"filename":1879,"language":1880,"meta":714,"style":714},"# Find all errors\ngrep '\"level\":\"error\"' .evlog\u002Flogs\u002F2026-03-14.jsonl\n\n# Find by request ID\ngrep 'req_abc123' .evlog\u002Flogs\u002F*.jsonl\n",[634,1989,1990,1995,2009,2013,2018],{"__ignoreMap":714},[718,1991,1992],{"class":720,"line":721},[718,1993,1994],{"class":769},"# Find all errors\n",[718,1996,1997,2000,2002,2005,2007],{"class":720,"line":773},[718,1998,1999],{"class":1831},"grep",[718,2001,742],{"class":728},[718,2003,2004],{"class":745},"\"level\":\"error\"",[718,2006,850],{"class":728},[718,2008,1893],{"class":745},[718,2010,2011],{"class":720,"line":792},[718,2012,796],{"emptyLinePlaceholder":795},[718,2014,2015],{"class":720,"line":799},[718,2016,2017],{"class":769},"# Find by request ID\n",[718,2019,2020,2022,2024,2027,2029,2032,2035],{"class":720,"line":830},[718,2021,1999],{"class":1831},[718,2023,742],{"class":728},[718,2025,2026],{"class":745},"req_abc123",[718,2028,850],{"class":728},[718,2030,2031],{"class":745}," .evlog\u002Flogs\u002F",[718,2033,2034],{"class":732},"*",[718,2036,2037],{"class":745},".jsonl\n",[701,2039,2041],{"id":2040},"call-the-drain-without-a-framework","Call the drain without a framework",[619,2043,2044],{},"For advanced use cases, use the lower-level write functions:",[708,2046,2048],{"className":710,"code":2047,"filename":712,"language":713,"meta":714,"style":714},"import { writeToFs, writeBatchToFs } from 'evlog\u002Ffs'\n\nawait writeToFs(event, {\n  dir: '.evlog\u002Flogs',\n  pretty: false,\n})\n\nawait writeBatchToFs(events, {\n  dir: '.evlog\u002Flogs',\n  pretty: false,\n})\n",[634,2049,2050,2074,2078,2091,2107,2119,2125,2129,2142,2156,2166],{"__ignoreMap":714},[718,2051,2052,2054,2056,2059,2061,2064,2066,2068,2070,2072],{"class":720,"line":721},[718,2053,725],{"class":724},[718,2055,729],{"class":728},[718,2057,2058],{"class":732}," writeToFs",[718,2060,858],{"class":728},[718,2062,2063],{"class":732}," writeBatchToFs",[718,2065,736],{"class":728},[718,2067,739],{"class":724},[718,2069,742],{"class":728},[718,2071,746],{"class":745},[718,2073,749],{"class":728},[718,2075,2076],{"class":720,"line":773},[718,2077,796],{"emptyLinePlaceholder":795},[718,2079,2080,2082,2084,2087,2089],{"class":720,"line":792},[718,2081,1168],{"class":724},[718,2083,2058],{"class":808},[718,2085,2086],{"class":732},"(event",[718,2088,858],{"class":728},[718,2090,827],{"class":728},[718,2092,2093,2096,2098,2100,2103,2105],{"class":720,"line":799},[718,2094,2095],{"class":847},"  dir",[718,2097,971],{"class":728},[718,2099,742],{"class":728},[718,2101,2102],{"class":745},".evlog\u002Flogs",[718,2104,850],{"class":728},[718,2106,981],{"class":728},[718,2108,2109,2112,2114,2117],{"class":720,"line":830},[718,2110,2111],{"class":847},"  pretty",[718,2113,971],{"class":728},[718,2115,2116],{"class":1625}," false",[718,2118,981],{"class":728},[718,2120,2121,2123],{"class":720,"line":866},[718,2122,869],{"class":728},[718,2124,872],{"class":732},[718,2126,2127],{"class":720,"line":984},[718,2128,796],{"emptyLinePlaceholder":795},[718,2130,2131,2133,2135,2138,2140],{"class":720,"line":999},[718,2132,1168],{"class":724},[718,2134,2063],{"class":808},[718,2136,2137],{"class":732},"(events",[718,2139,858],{"class":728},[718,2141,827],{"class":728},[718,2143,2144,2146,2148,2150,2152,2154],{"class":720,"line":1600},[718,2145,2095],{"class":847},[718,2147,971],{"class":728},[718,2149,742],{"class":728},[718,2151,2102],{"class":745},[718,2153,850],{"class":728},[718,2155,981],{"class":728},[718,2157,2158,2160,2162,2164],{"class":720,"line":1605},[718,2159,2111],{"class":847},[718,2161,971],{"class":728},[718,2163,2116],{"class":1625},[718,2165,981],{"class":728},[718,2167,2168,2170],{"class":720,"line":1611},[718,2169,869],{"class":728},[718,2171,872],{"class":732},[701,2173,2175],{"id":2174},"hand-the-file-to-an-agent","Hand the file to an agent",[619,2177,2178,2179,2185],{},"The file system drain pairs with the ",[690,2180,2181,2184],{"href":580},[634,2182,2183],{},"analyze-logs"," agent skill",". When installed, your AI assistant can read the NDJSON logs directly to debug errors, trace requests, and investigate performance without any external tools.",[701,2187,2189],{"id":2188},"next-steps","Next Steps",[623,2191,2192,2197,2203,2209],{},[626,2193,2194,2196],{},[690,2195,579],{"href":580}," - Let AI analyze your logs",[626,2198,2199,2202],{},[690,2200,2201],{"href":162},"Axiom Adapter"," - Send logs to Axiom for querying and dashboards",[626,2204,2205,2208],{},[690,2206,2207],{"href":545},"Pipeline"," - Add batching and retry to any drain",[626,2210,2211,2214],{},[690,2212,2213],{"href":540},"Custom Adapters"," - Build your own adapter",[2216,2217,2218],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki 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