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Adapter",{"type":606,"value":607,"toc":2209},"minimark",[608,612,644,690,694,697,740,743,746,1341,1347,1351,1360,1367,1384,1387,1391,1494,1498,1657,1661,1671,1678,1682,1691,1695,1698,1857,1861,1865,1884,1888,1971,1975,2028,2032,2035,2162,2166,2176,2180,2205],[609,610,611],"p",{},"The File System adapter writes your wide events to local NDJSON files (one JSON object per line, one file per day). This enables:",[613,614,615,628,638],"ul",{},[616,617,618,622,623,627],"li",{},[619,620,621],"strong",{},"AI agent integration"," - point a skill to ",[624,625,626],"code",{},".evlog\u002Flogs\u002F"," to parse structured logs for debugging and pattern analysis",[616,629,630,633,634,637],{},[619,631,632],{},"Local dev debugging"," - persistent log history without scrolling the terminal (",[624,635,636],{},"tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl",")",[616,639,640,643],{},[619,641,642],{},"Production backup"," - combine with a network drain (Axiom, OTLP) for local fallback",[645,646,649,652,676],"prompt",{":actions":647,"description":648,"icon":219},"[\"copy\",\"cursor\",\"claude\"]","Add the file system drain adapter",[609,650,651],{},"Add the file system drain adapter to write evlog wide events locally as NDJSON files.",[653,654,655,658,661,664,667,670,673],"ol",{},[616,656,657],{},"Identify which framework I'm using and follow its evlog integration pattern",[616,659,660],{},"Install evlog if not already installed",[616,662,663],{},"Import createFsDrain from 'evlog\u002Ffs'",[616,665,666],{},"Wire createFsDrain() into my framework's drain configuration",[616,668,669],{},"Logs are written to .evlog\u002Flogs\u002F by default (one file per day, auto .gitignore)",[616,671,672],{},"Optionally configure dir, maxFiles, maxSizePerFile, or pretty options",[616,674,675],{},"Test by triggering a request and checking .evlog\u002Flogs\u002F*.jsonl",[609,677,678,679,685,686],{},"Adapter docs: ",[680,681,682],"a",{"href":682,"rel":683},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Fself-hosted\u002Ffs",[684],"nofollow","\nFramework setup: ",[680,687,688],{"href":688,"rel":689},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Foverview",[684],[691,692,20],"h2",{"id":693},"installation",[609,695,696],{},"The File System adapter comes bundled with evlog:",[698,699,705],"pre",{"className":700,"code":701,"filename":702,"language":703,"meta":704,"style":704},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { createFsDrain } from 'evlog\u002Ffs'\n","src\u002Findex.ts","typescript","",[624,706,707],{"__ignoreMap":704},[708,709,712,716,720,724,727,730,733,737],"span",{"class":710,"line":711},"line",1,[708,713,715],{"class":714},"s7zQu","import",[708,717,719],{"class":718},"sMK4o"," {",[708,721,723],{"class":722},"sTEyZ"," createFsDrain",[708,725,726],{"class":718}," }",[708,728,729],{"class":714}," from",[708,731,732],{"class":718}," '",[708,734,736],{"class":735},"sfazB","evlog\u002Ffs",[708,738,739],{"class":718},"'\n",[691,741,25],{"id":742},"quick-start",[609,744,745],{},"No credentials or environment variables needed. Just wire the drain to your framework:",[747,748,749,863,994,1011,1073,1127,1186,1240,1293],"code-group",{},[698,750,753],{"className":700,"code":751,"filename":752,"language":703,"meta":704,"style":704},"\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",[624,754,755,761,780,787,818,854],{"__ignoreMap":704},[708,756,757],{"class":710,"line":711},[708,758,760],{"class":759},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\n",[708,762,764,766,768,770,772,774,776,778],{"class":710,"line":763},2,[708,765,715],{"class":714},[708,767,719],{"class":718},[708,769,723],{"class":722},[708,771,726],{"class":718},[708,773,729],{"class":714},[708,775,732],{"class":718},[708,777,736],{"class":735},[708,779,739],{"class":718},[708,781,783],{"class":710,"line":782},3,[708,784,786],{"emptyLinePlaceholder":785},true,"\n",[708,788,790,793,796,800,803,805,809,811,815],{"class":710,"line":789},4,[708,791,792],{"class":714},"export",[708,794,795],{"class":714}," default",[708,797,799],{"class":798},"s2Zo4"," defineNitroPlugin",[708,801,802],{"class":722},"(",[708,804,802],{"class":718},[708,806,808],{"class":807},"sHdIc","nitroApp",[708,810,637],{"class":718},[708,812,814],{"class":813},"spNyl"," =>",[708,816,817],{"class":718}," {\n",[708,819,821,824,827,830,832,835,838,841,844,846,849,851],{"class":710,"line":820},5,[708,822,823],{"class":722},"  nitroApp",[708,825,826],{"class":718},".",[708,828,829],{"class":722},"hooks",[708,831,826],{"class":718},[708,833,834],{"class":798},"hook",[708,836,802],{"class":837},"swJcz",[708,839,840],{"class":718},"'",[708,842,843],{"class":735},"evlog:drain",[708,845,840],{"class":718},[708,847,848],{"class":718},",",[708,850,723],{"class":798},[708,852,853],{"class":837},"())\n",[708,855,857,860],{"class":710,"line":856},6,[708,858,859],{"class":718},"}",[708,861,862],{"class":722},")\n",[698,864,866],{"className":700,"code":865,"filename":245,"language":703,"meta":704,"style":704},"\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",[624,867,868,873,893,911,915,954,972,987],{"__ignoreMap":704},[708,869,870],{"class":710,"line":711},[708,871,872],{"class":759},"\u002F\u002F lib\u002Fevlog.ts — Node.js routes only; keep evlog\u002Ffs out of root instrumentation.ts\n",[708,874,875,877,879,882,884,886,888,891],{"class":710,"line":763},[708,876,715],{"class":714},[708,878,719],{"class":718},[708,880,881],{"class":722}," createEvlog",[708,883,726],{"class":718},[708,885,729],{"class":714},[708,887,732],{"class":718},[708,889,890],{"class":735},"evlog\u002Fnext",[708,892,739],{"class":718},[708,894,895,897,899,901,903,905,907,909],{"class":710,"line":782},[708,896,715],{"class":714},[708,898,719],{"class":718},[708,900,723],{"class":722},[708,902,726],{"class":718},[708,904,729],{"class":714},[708,906,732],{"class":718},[708,908,736],{"class":735},[708,910,739],{"class":718},[708,912,913],{"class":710,"line":789},[708,914,786],{"emptyLinePlaceholder":785},[708,916,917,919,922,924,927,929,932,934,937,939,942,944,947,949,951],{"class":710,"line":820},[708,918,792],{"class":714},[708,920,921],{"class":813}," const",[708,923,719],{"class":718},[708,925,926],{"class":722}," withEvlog",[708,928,848],{"class":718},[708,930,931],{"class":722}," useLogger",[708,933,848],{"class":718},[708,935,936],{"class":722}," log",[708,938,848],{"class":718},[708,940,941],{"class":722}," createError ",[708,943,859],{"class":718},[708,945,946],{"class":718}," =",[708,948,881],{"class":798},[708,950,802],{"class":722},[708,952,953],{"class":718},"{\n",[708,955,956,959,962,964,967,969],{"class":710,"line":856},[708,957,958],{"class":837},"  service",[708,960,961],{"class":718},":",[708,963,732],{"class":718},[708,965,966],{"class":735},"my-app",[708,968,840],{"class":718},[708,970,971],{"class":718},",\n",[708,973,975,978,980,982,985],{"class":710,"line":974},7,[708,976,977],{"class":837},"  drain",[708,979,961],{"class":718},[708,981,723],{"class":798},[708,983,984],{"class":722},"()",[708,986,971],{"class":718},[708,988,990,992],{"class":710,"line":989},8,[708,991,859],{"class":718},[708,993,862],{"class":722},[995,996,998,999,1002,1003,1006,1007,1010],"callout",{"color":997,"icon":13},"info","The FS adapter requires Node.js (",[624,1000,1001],{},"node:fs","). On the Edge runtime, or when its directory is not writable, it logs a one-time ",[624,1004,1005],{},"[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 ",[624,1008,1009],{},"evlog\u002Fmemory"," or an HTTP adapter for those.",[698,1012,1014],{"className":700,"code":1013,"filename":275,"language":703,"meta":704,"style":704},"import { createFsDrain } from 'evlog\u002Ffs'\n\napp.use(evlog({ drain: createFsDrain() }))\n",[624,1015,1016,1034,1038],{"__ignoreMap":704},[708,1017,1018,1020,1022,1024,1026,1028,1030,1032],{"class":710,"line":711},[708,1019,715],{"class":714},[708,1021,719],{"class":718},[708,1023,723],{"class":722},[708,1025,726],{"class":718},[708,1027,729],{"class":714},[708,1029,732],{"class":718},[708,1031,736],{"class":735},[708,1033,739],{"class":718},[708,1035,1036],{"class":710,"line":763},[708,1037,786],{"emptyLinePlaceholder":785},[708,1039,1040,1043,1045,1048,1050,1053,1055,1058,1061,1063,1065,1068,1070],{"class":710,"line":782},[708,1041,1042],{"class":722},"app",[708,1044,826],{"class":718},[708,1046,1047],{"class":798},"use",[708,1049,802],{"class":722},[708,1051,1052],{"class":798},"evlog",[708,1054,802],{"class":722},[708,1056,1057],{"class":718},"{",[708,1059,1060],{"class":837}," drain",[708,1062,961],{"class":718},[708,1064,723],{"class":798},[708,1066,1067],{"class":722},"() ",[708,1069,859],{"class":718},[708,1071,1072],{"class":722},"))\n",[698,1074,1075],{"className":700,"code":1013,"filename":270,"language":703,"meta":704,"style":704},[624,1076,1077,1095,1099],{"__ignoreMap":704},[708,1078,1079,1081,1083,1085,1087,1089,1091,1093],{"class":710,"line":711},[708,1080,715],{"class":714},[708,1082,719],{"class":718},[708,1084,723],{"class":722},[708,1086,726],{"class":718},[708,1088,729],{"class":714},[708,1090,732],{"class":718},[708,1092,736],{"class":735},[708,1094,739],{"class":718},[708,1096,1097],{"class":710,"line":763},[708,1098,786],{"emptyLinePlaceholder":785},[708,1100,1101,1103,1105,1107,1109,1111,1113,1115,1117,1119,1121,1123,1125],{"class":710,"line":782},[708,1102,1042],{"class":722},[708,1104,826],{"class":718},[708,1106,1047],{"class":798},[708,1108,802],{"class":722},[708,1110,1052],{"class":798},[708,1112,802],{"class":722},[708,1114,1057],{"class":718},[708,1116,1060],{"class":837},[708,1118,961],{"class":718},[708,1120,723],{"class":798},[708,1122,1067],{"class":722},[708,1124,859],{"class":718},[708,1126,1072],{"class":722},[698,1128,1130],{"className":700,"code":1129,"filename":280,"language":703,"meta":704,"style":704},"import { createFsDrain } from 'evlog\u002Ffs'\n\nawait app.register(evlog, { drain: createFsDrain() })\n",[624,1131,1132,1150,1154],{"__ignoreMap":704},[708,1133,1134,1136,1138,1140,1142,1144,1146,1148],{"class":710,"line":711},[708,1135,715],{"class":714},[708,1137,719],{"class":718},[708,1139,723],{"class":722},[708,1141,726],{"class":718},[708,1143,729],{"class":714},[708,1145,732],{"class":718},[708,1147,736],{"class":735},[708,1149,739],{"class":718},[708,1151,1152],{"class":710,"line":763},[708,1153,786],{"emptyLinePlaceholder":785},[708,1155,1156,1159,1162,1164,1167,1170,1172,1174,1176,1178,1180,1182,1184],{"class":710,"line":782},[708,1157,1158],{"class":714},"await",[708,1160,1161],{"class":722}," app",[708,1163,826],{"class":718},[708,1165,1166],{"class":798},"register",[708,1168,1169],{"class":722},"(evlog",[708,1171,848],{"class":718},[708,1173,719],{"class":718},[708,1175,1060],{"class":837},[708,1177,961],{"class":718},[708,1179,723],{"class":798},[708,1181,1067],{"class":722},[708,1183,859],{"class":718},[708,1185,862],{"class":722},[698,1187,1188],{"className":700,"code":1013,"filename":285,"language":703,"meta":704,"style":704},[624,1189,1190,1208,1212],{"__ignoreMap":704},[708,1191,1192,1194,1196,1198,1200,1202,1204,1206],{"class":710,"line":711},[708,1193,715],{"class":714},[708,1195,719],{"class":718},[708,1197,723],{"class":722},[708,1199,726],{"class":718},[708,1201,729],{"class":714},[708,1203,732],{"class":718},[708,1205,736],{"class":735},[708,1207,739],{"class":718},[708,1209,1210],{"class":710,"line":763},[708,1211,786],{"emptyLinePlaceholder":785},[708,1213,1214,1216,1218,1220,1222,1224,1226,1228,1230,1232,1234,1236,1238],{"class":710,"line":782},[708,1215,1042],{"class":722},[708,1217,826],{"class":718},[708,1219,1047],{"class":798},[708,1221,802],{"class":722},[708,1223,1052],{"class":798},[708,1225,802],{"class":722},[708,1227,1057],{"class":718},[708,1229,1060],{"class":837},[708,1231,961],{"class":718},[708,1233,723],{"class":798},[708,1235,1067],{"class":722},[708,1237,859],{"class":718},[708,1239,1072],{"class":722},[698,1241,1243],{"className":700,"code":1242,"filename":265,"language":703,"meta":704,"style":704},"import { createFsDrain } from 'evlog\u002Ffs'\n\nEvlogModule.forRoot({ drain: createFsDrain() })\n",[624,1244,1245,1263,1267],{"__ignoreMap":704},[708,1246,1247,1249,1251,1253,1255,1257,1259,1261],{"class":710,"line":711},[708,1248,715],{"class":714},[708,1250,719],{"class":718},[708,1252,723],{"class":722},[708,1254,726],{"class":718},[708,1256,729],{"class":714},[708,1258,732],{"class":718},[708,1260,736],{"class":735},[708,1262,739],{"class":718},[708,1264,1265],{"class":710,"line":763},[708,1266,786],{"emptyLinePlaceholder":785},[708,1268,1269,1272,1274,1277,1279,1281,1283,1285,1287,1289,1291],{"class":710,"line":782},[708,1270,1271],{"class":722},"EvlogModule",[708,1273,826],{"class":718},[708,1275,1276],{"class":798},"forRoot",[708,1278,802],{"class":722},[708,1280,1057],{"class":718},[708,1282,1060],{"class":837},[708,1284,961],{"class":718},[708,1286,723],{"class":798},[708,1288,1067],{"class":722},[708,1290,859],{"class":718},[708,1292,862],{"class":722},[698,1294,1296],{"className":700,"code":1295,"filename":300,"language":703,"meta":704,"style":704},"import { createFsDrain } from 'evlog\u002Ffs'\n\ninitLogger({ drain: createFsDrain() })\n",[624,1297,1298,1316,1320],{"__ignoreMap":704},[708,1299,1300,1302,1304,1306,1308,1310,1312,1314],{"class":710,"line":711},[708,1301,715],{"class":714},[708,1303,719],{"class":718},[708,1305,723],{"class":722},[708,1307,726],{"class":718},[708,1309,729],{"class":714},[708,1311,732],{"class":718},[708,1313,736],{"class":735},[708,1315,739],{"class":718},[708,1317,1318],{"class":710,"line":763},[708,1319,786],{"emptyLinePlaceholder":785},[708,1321,1322,1325,1327,1329,1331,1333,1335,1337,1339],{"class":710,"line":782},[708,1323,1324],{"class":798},"initLogger",[708,1326,802],{"class":722},[708,1328,1057],{"class":718},[708,1330,1060],{"class":837},[708,1332,961],{"class":718},[708,1334,723],{"class":798},[708,1336,1067],{"class":722},[708,1338,859],{"class":718},[708,1340,862],{"class":722},[609,1342,1343,1344,1346],{},"Logs start appearing in ",[624,1345,626],{}," immediately.",[691,1348,1350],{"id":1349},"where-the-files-land","Where the files land",[698,1352,1358],{"className":1353,"code":1355,"filename":1356,"language":1357,"meta":704},[1354],"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",[624,1359,1355],{"__ignoreMap":704},[609,1361,1362,1363,1366],{},"Each ",[624,1364,1365],{},".jsonl"," file contains one JSON object per line (NDJSON format), making it easy to parse, grep, and stream.",[995,1368,1371,1372,1375,1376,1379,1380,1383],{"color":1369,"icon":1370},"success","i-lucide-git-branch","A ",[624,1373,1374],{},".gitignore"," is automatically created on first write, inside the ",[624,1377,1378],{},".evlog\u002F"," ancestor directory when present or in the configured ",[624,1381,1382],{},"dir"," otherwise. Log files are never committed to version control.",[691,1385,547],{"id":1386},"configuration",[1388,1389,346],"h3",{"id":1390},"options",[1392,1393,1394,1413],"table",{},[1395,1396,1397],"thead",{},[1398,1399,1400,1404,1407,1410],"tr",{},[1401,1402,1403],"th",{},"Option",[1401,1405,1406],{},"Type",[1401,1408,1409],{},"Default",[1401,1411,1412],{},"Description",[1414,1415,1416,1436,1456,1474],"tbody",{},[1398,1417,1418,1423,1428,1433],{},[1419,1420,1421],"td",{},[624,1422,1382],{},[1419,1424,1425],{},[624,1426,1427],{},"string",[1419,1429,1430],{},[624,1431,1432],{},"'.evlog\u002Flogs'",[1419,1434,1435],{},"Directory for log files",[1398,1437,1438,1443,1448,1453],{},[1419,1439,1440],{},[624,1441,1442],{},"maxFiles",[1419,1444,1445],{},[624,1446,1447],{},"number",[1419,1449,1450],{},[624,1451,1452],{},"undefined",[1419,1454,1455],{},"Max files to keep (auto-deletes oldest)",[1398,1457,1458,1463,1467,1471],{},[1419,1459,1460],{},[624,1461,1462],{},"maxSizePerFile",[1419,1464,1465],{},[624,1466,1447],{},[1419,1468,1469],{},[624,1470,1452],{},[1419,1472,1473],{},"Max bytes per file before rotating",[1398,1475,1476,1481,1486,1491],{},[1419,1477,1478],{},[624,1479,1480],{},"pretty",[1419,1482,1483],{},[624,1484,1485],{},"boolean",[1419,1487,1488],{},[624,1489,1490],{},"false",[1419,1492,1493],{},"Pretty-print JSON (multi-line, readable)",[1388,1495,1497],{"id":1496},"examples","Examples",[698,1499,1502],{"className":700,"code":1500,"filename":1501,"language":703,"meta":704,"style":704},"\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",[624,1503,1504,1509,1531,1535,1540,1548,1570,1582,1588,1593,1599,1621,1626,1632],{"__ignoreMap":704},[708,1505,1506],{"class":710,"line":711},[708,1507,1508],{"class":759},"\u002F\u002F Keep only the last 7 days of logs\n",[708,1510,1511,1514,1516,1518,1521,1523,1527,1529],{"class":710,"line":763},[708,1512,1513],{"class":798},"createFsDrain",[708,1515,802],{"class":722},[708,1517,1057],{"class":718},[708,1519,1520],{"class":837}," maxFiles",[708,1522,961],{"class":718},[708,1524,1526],{"class":1525},"sbssI"," 7",[708,1528,726],{"class":718},[708,1530,862],{"class":722},[708,1532,1533],{"class":710,"line":782},[708,1534,786],{"emptyLinePlaceholder":785},[708,1536,1537],{"class":710,"line":789},[708,1538,1539],{"class":759},"\u002F\u002F Rotate files at 10MB, keep 30 files\n",[708,1541,1542,1544,1546],{"class":710,"line":820},[708,1543,1513],{"class":798},[708,1545,802],{"class":722},[708,1547,953],{"class":718},[708,1549,1550,1553,1555,1558,1561,1564,1566,1568],{"class":710,"line":856},[708,1551,1552],{"class":837},"  maxSizePerFile",[708,1554,961],{"class":718},[708,1556,1557],{"class":1525}," 10",[708,1559,1560],{"class":718}," *",[708,1562,1563],{"class":1525}," 1024",[708,1565,1560],{"class":718},[708,1567,1563],{"class":1525},[708,1569,971],{"class":718},[708,1571,1572,1575,1577,1580],{"class":710,"line":974},[708,1573,1574],{"class":837},"  maxFiles",[708,1576,961],{"class":718},[708,1578,1579],{"class":1525}," 30",[708,1581,971],{"class":718},[708,1583,1584,1586],{"class":710,"line":989},[708,1585,859],{"class":718},[708,1587,862],{"class":722},[708,1589,1591],{"class":710,"line":1590},9,[708,1592,786],{"emptyLinePlaceholder":785},[708,1594,1596],{"class":710,"line":1595},10,[708,1597,1598],{"class":759},"\u002F\u002F Pretty-print for human reading\n",[708,1600,1602,1604,1606,1608,1611,1613,1617,1619],{"class":710,"line":1601},11,[708,1603,1513],{"class":798},[708,1605,802],{"class":722},[708,1607,1057],{"class":718},[708,1609,1610],{"class":837}," pretty",[708,1612,961],{"class":718},[708,1614,1616],{"class":1615},"sfNiH"," true",[708,1618,726],{"class":718},[708,1620,862],{"class":722},[708,1622,1624],{"class":710,"line":1623},12,[708,1625,786],{"emptyLinePlaceholder":785},[708,1627,1629],{"class":710,"line":1628},13,[708,1630,1631],{"class":759},"\u002F\u002F Custom directory\n",[708,1633,1635,1637,1639,1641,1644,1646,1648,1651,1653,1655],{"class":710,"line":1634},14,[708,1636,1513],{"class":798},[708,1638,802],{"class":722},[708,1640,1057],{"class":718},[708,1642,1643],{"class":837}," dir",[708,1645,961],{"class":718},[708,1647,732],{"class":718},[708,1649,1650],{"class":735},"\u002Fvar\u002Flog\u002Fmyapp",[708,1652,840],{"class":718},[708,1654,726],{"class":718},[708,1656,862],{"class":722},[1388,1658,1660],{"id":1659},"rotate-by-size-or-by-day","Rotate by size or by day",[609,1662,1663,1664,1667,1668,1670],{},"By default, a new file is created each day (",[624,1665,1666],{},"2026-03-14.jsonl","). When ",[624,1669,1462],{}," is set, the adapter creates suffixed files when the current file exceeds the limit:",[698,1672,1676],{"className":1673,"code":1674,"filename":1675,"language":1357,"meta":704},[1354],".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",[624,1677,1674],{"__ignoreMap":704},[1388,1679,1681],{"id":1680},"delete-old-files-on-a-schedule","Delete old files on a schedule",[609,1683,1684,1685,1687,1688,1690],{},"When ",[624,1686,1442],{}," is set, the adapter automatically deletes the oldest ",[624,1689,1365],{}," files after each write, keeping only the most recent files.",[691,1692,1694],{"id":1693},"write-to-disk-and-ship-to-a-service","Write to disk and ship to a service",[609,1696,1697],{},"Use the FS adapter alongside a network drain for local backup:",[698,1699,1701],{"className":700,"code":1700,"filename":1501,"language":703,"meta":704,"style":704},"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",[624,1702,1703,1721,1741,1745,1772,1786,1790,1814,1852],{"__ignoreMap":704},[708,1704,1705,1707,1709,1711,1713,1715,1717,1719],{"class":710,"line":711},[708,1706,715],{"class":714},[708,1708,719],{"class":718},[708,1710,723],{"class":722},[708,1712,726],{"class":718},[708,1714,729],{"class":714},[708,1716,732],{"class":718},[708,1718,736],{"class":735},[708,1720,739],{"class":718},[708,1722,1723,1725,1727,1730,1732,1734,1736,1739],{"class":710,"line":763},[708,1724,715],{"class":714},[708,1726,719],{"class":718},[708,1728,1729],{"class":722}," createAxiomDrain",[708,1731,726],{"class":718},[708,1733,729],{"class":714},[708,1735,732],{"class":718},[708,1737,1738],{"class":735},"evlog\u002Faxiom",[708,1740,739],{"class":718},[708,1742,1743],{"class":710,"line":782},[708,1744,786],{"emptyLinePlaceholder":785},[708,1746,1747,1750,1753,1756,1758,1760,1762,1764,1766,1768,1770],{"class":710,"line":789},[708,1748,1749],{"class":813},"const",[708,1751,1752],{"class":722}," fs ",[708,1754,1755],{"class":718},"=",[708,1757,723],{"class":798},[708,1759,802],{"class":722},[708,1761,1057],{"class":718},[708,1763,1520],{"class":837},[708,1765,961],{"class":718},[708,1767,1526],{"class":1525},[708,1769,726],{"class":718},[708,1771,862],{"class":722},[708,1773,1774,1776,1779,1781,1783],{"class":710,"line":820},[708,1775,1749],{"class":813},[708,1777,1778],{"class":722}," axiom ",[708,1780,1755],{"class":718},[708,1782,1729],{"class":798},[708,1784,1785],{"class":722},"()\n",[708,1787,1788],{"class":710,"line":856},[708,1789,786],{"emptyLinePlaceholder":785},[708,1791,1792,1794,1797,1799,1802,1805,1808,1810,1812],{"class":710,"line":974},[708,1793,1749],{"class":813},[708,1795,1796],{"class":722}," drain ",[708,1798,1755],{"class":718},[708,1800,1801],{"class":813}," async",[708,1803,1804],{"class":718}," (",[708,1806,1807],{"class":807},"ctx",[708,1809,637],{"class":718},[708,1811,814],{"class":813},[708,1813,817],{"class":718},[708,1815,1816,1819,1823,1825,1828,1831,1834,1836,1838,1840,1842,1845,1847,1849],{"class":710,"line":989},[708,1817,1818],{"class":714},"  await",[708,1820,1822],{"class":1821},"sBMFI"," Promise",[708,1824,826],{"class":718},[708,1826,1827],{"class":798},"allSettled",[708,1829,1830],{"class":837},"([",[708,1832,1833],{"class":798},"fs",[708,1835,802],{"class":837},[708,1837,1807],{"class":722},[708,1839,637],{"class":837},[708,1841,848],{"class":718},[708,1843,1844],{"class":798}," axiom",[708,1846,802],{"class":837},[708,1848,1807],{"class":722},[708,1850,1851],{"class":837},")])\n",[708,1853,1854],{"class":710,"line":1590},[708,1855,1856],{"class":718},"}\n",[691,1858,1860],{"id":1859},"read-back-what-you-wrote","Read back what you wrote",[1388,1862,1864],{"id":1863},"stream-in-real-time","Stream in real-time",[698,1866,1871],{"className":1867,"code":1868,"filename":1869,"language":1870,"meta":704,"style":704},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl\n","Terminal","bash",[624,1872,1873],{"__ignoreMap":704},[708,1874,1875,1878,1881],{"class":710,"line":711},[708,1876,1877],{"class":1821},"tail",[708,1879,1880],{"class":735}," -f",[708,1882,1883],{"class":735}," .evlog\u002Flogs\u002F2026-03-14.jsonl\n",[1388,1885,1887],{"id":1886},"search-with-jq","Search with jq",[698,1889,1891],{"className":1867,"code":1890,"filename":1869,"language":1870,"meta":704,"style":704},"# 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",[624,1892,1893,1898,1919,1923,1928,1945,1949,1954],{"__ignoreMap":704},[708,1894,1895],{"class":710,"line":711},[708,1896,1897],{"class":759},"# Find errors\n",[708,1899,1900,1903,1906,1909,1912,1914,1917],{"class":710,"line":763},[708,1901,1902],{"class":1821},"cat",[708,1904,1905],{"class":735}," .evlog\u002Flogs\u002F2026-03-14.jsonl",[708,1907,1908],{"class":718}," |",[708,1910,1911],{"class":1821}," jq",[708,1913,732],{"class":718},[708,1915,1916],{"class":735},"select(.level == \"error\")",[708,1918,739],{"class":718},[708,1920,1921],{"class":710,"line":782},[708,1922,786],{"emptyLinePlaceholder":785},[708,1924,1925],{"class":710,"line":789},[708,1926,1927],{"class":759},"# Slow requests (over 1s)\n",[708,1929,1930,1932,1934,1936,1938,1940,1943],{"class":710,"line":820},[708,1931,1902],{"class":1821},[708,1933,1905],{"class":735},[708,1935,1908],{"class":718},[708,1937,1911],{"class":1821},[708,1939,732],{"class":718},[708,1941,1942],{"class":735},"select(.durationMs > 1000)",[708,1944,739],{"class":718},[708,1946,1947],{"class":710,"line":856},[708,1948,786],{"emptyLinePlaceholder":785},[708,1950,1951],{"class":710,"line":974},[708,1952,1953],{"class":759},"# Requests by path\n",[708,1955,1956,1958,1960,1962,1964,1966,1969],{"class":710,"line":989},[708,1957,1902],{"class":1821},[708,1959,1905],{"class":735},[708,1961,1908],{"class":718},[708,1963,1911],{"class":1821},[708,1965,732],{"class":718},[708,1967,1968],{"class":735},"select(.path == \"\u002Fapi\u002Fcheckout\")",[708,1970,739],{"class":718},[1388,1972,1974],{"id":1973},"search-with-grep","Search with grep",[698,1976,1978],{"className":1867,"code":1977,"filename":1869,"language":1870,"meta":704,"style":704},"# 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",[624,1979,1980,1985,1999,2003,2008],{"__ignoreMap":704},[708,1981,1982],{"class":710,"line":711},[708,1983,1984],{"class":759},"# Find all errors\n",[708,1986,1987,1990,1992,1995,1997],{"class":710,"line":763},[708,1988,1989],{"class":1821},"grep",[708,1991,732],{"class":718},[708,1993,1994],{"class":735},"\"level\":\"error\"",[708,1996,840],{"class":718},[708,1998,1883],{"class":735},[708,2000,2001],{"class":710,"line":782},[708,2002,786],{"emptyLinePlaceholder":785},[708,2004,2005],{"class":710,"line":789},[708,2006,2007],{"class":759},"# Find by request ID\n",[708,2009,2010,2012,2014,2017,2019,2022,2025],{"class":710,"line":820},[708,2011,1989],{"class":1821},[708,2013,732],{"class":718},[708,2015,2016],{"class":735},"req_abc123",[708,2018,840],{"class":718},[708,2020,2021],{"class":735}," .evlog\u002Flogs\u002F",[708,2023,2024],{"class":722},"*",[708,2026,2027],{"class":735},".jsonl\n",[691,2029,2031],{"id":2030},"call-the-drain-without-a-framework","Call the drain without a framework",[609,2033,2034],{},"For advanced use cases, use the lower-level write functions:",[698,2036,2038],{"className":700,"code":2037,"filename":702,"language":703,"meta":704,"style":704},"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",[624,2039,2040,2064,2068,2081,2097,2109,2115,2119,2132,2146,2156],{"__ignoreMap":704},[708,2041,2042,2044,2046,2049,2051,2054,2056,2058,2060,2062],{"class":710,"line":711},[708,2043,715],{"class":714},[708,2045,719],{"class":718},[708,2047,2048],{"class":722}," writeToFs",[708,2050,848],{"class":718},[708,2052,2053],{"class":722}," writeBatchToFs",[708,2055,726],{"class":718},[708,2057,729],{"class":714},[708,2059,732],{"class":718},[708,2061,736],{"class":735},[708,2063,739],{"class":718},[708,2065,2066],{"class":710,"line":763},[708,2067,786],{"emptyLinePlaceholder":785},[708,2069,2070,2072,2074,2077,2079],{"class":710,"line":782},[708,2071,1158],{"class":714},[708,2073,2048],{"class":798},[708,2075,2076],{"class":722},"(event",[708,2078,848],{"class":718},[708,2080,817],{"class":718},[708,2082,2083,2086,2088,2090,2093,2095],{"class":710,"line":789},[708,2084,2085],{"class":837},"  dir",[708,2087,961],{"class":718},[708,2089,732],{"class":718},[708,2091,2092],{"class":735},".evlog\u002Flogs",[708,2094,840],{"class":718},[708,2096,971],{"class":718},[708,2098,2099,2102,2104,2107],{"class":710,"line":820},[708,2100,2101],{"class":837},"  pretty",[708,2103,961],{"class":718},[708,2105,2106],{"class":1615}," false",[708,2108,971],{"class":718},[708,2110,2111,2113],{"class":710,"line":856},[708,2112,859],{"class":718},[708,2114,862],{"class":722},[708,2116,2117],{"class":710,"line":974},[708,2118,786],{"emptyLinePlaceholder":785},[708,2120,2121,2123,2125,2128,2130],{"class":710,"line":989},[708,2122,1158],{"class":714},[708,2124,2053],{"class":798},[708,2126,2127],{"class":722},"(events",[708,2129,848],{"class":718},[708,2131,817],{"class":718},[708,2133,2134,2136,2138,2140,2142,2144],{"class":710,"line":1590},[708,2135,2085],{"class":837},[708,2137,961],{"class":718},[708,2139,732],{"class":718},[708,2141,2092],{"class":735},[708,2143,840],{"class":718},[708,2145,971],{"class":718},[708,2147,2148,2150,2152,2154],{"class":710,"line":1595},[708,2149,2101],{"class":837},[708,2151,961],{"class":718},[708,2153,2106],{"class":1615},[708,2155,971],{"class":718},[708,2157,2158,2160],{"class":710,"line":1601},[708,2159,859],{"class":718},[708,2161,862],{"class":722},[691,2163,2165],{"id":2164},"hand-the-file-to-an-agent","Hand the file to an agent",[609,2167,2168,2169,2175],{},"The file system drain pairs with the ",[680,2170,2171,2174],{"href":570},[624,2172,2173],{},"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.",[691,2177,2179],{"id":2178},"next-steps","Next Steps",[613,2181,2182,2187,2193,2199],{},[616,2183,2184,2186],{},[680,2185,569],{"href":570}," - Let AI analyze your logs",[616,2188,2189,2192],{},[680,2190,2191],{"href":162},"Axiom Adapter"," - Send logs to Axiom for querying and dashboards",[616,2194,2195,2198],{},[680,2196,2197],{"href":535},"Pipeline"," - Add batching and retry to any drain",[616,2200,2201,2204],{},[680,2202,2203],{"href":530},"Custom Adapters"," - Build your own adapter",[2206,2207,2208],"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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