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This enables:",[609,610,611,624,634],"ul",{},[612,613,614,618,619,623],"li",{},[615,616,617],"strong",{},"AI agent integration"," - point a skill to ",[620,621,622],"code",{},".evlog\u002Flogs\u002F"," to parse structured logs for debugging and pattern analysis",[612,625,626,629,630,633],{},[615,627,628],{},"Local dev debugging"," - persistent log history without scrolling the terminal (",[620,631,632],{},"tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl",")",[612,635,636,639],{},[615,637,638],{},"Production backup"," - combine with a network drain (Axiom, OTLP) for local fallback",[641,642,645,648,672],"prompt",{":actions":643,"description":644,"icon":219},"[\"copy\",\"cursor\",\"claude\"]","Add the file system drain adapter",[605,646,647],{},"Add the file system drain adapter to write evlog wide events locally as NDJSON files.",[649,650,651,654,657,660,663,666,669],"ol",{},[612,652,653],{},"Identify which framework I'm using and follow its evlog integration pattern",[612,655,656],{},"Install evlog if not already installed",[612,658,659],{},"Import createFsDrain from 'evlog\u002Ffs'",[612,661,662],{},"Wire createFsDrain() into my framework's drain configuration",[612,664,665],{},"Logs are written to .evlog\u002Flogs\u002F by default (one file per day, auto .gitignore)",[612,667,668],{},"Optionally configure dir, maxFiles, maxSizePerFile, or pretty options",[612,670,671],{},"Test by triggering a request and checking .evlog\u002Flogs\u002F*.jsonl",[605,673,674,675,681,682],{},"Adapter docs: ",[676,677,678],"a",{"href":678,"rel":679},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fadapters\u002Fself-hosted\u002Ffs",[680],"nofollow","\nFramework setup: ",[676,683,684],{"href":684,"rel":685},"https:\u002F\u002Fwww.evlog.dev\u002Fintegrate\u002Fframeworks\u002Foverview",[680],[687,688,20],"h2",{"id":689},"installation",[605,691,692],{},"The File System adapter comes bundled with evlog:",[694,695,701],"pre",{"className":696,"code":697,"filename":698,"language":699,"meta":700,"style":700},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { createFsDrain } from 'evlog\u002Ffs'\n","src\u002Findex.ts","typescript","",[620,702,703],{"__ignoreMap":700},[704,705,708,712,716,720,723,726,729,733],"span",{"class":706,"line":707},"line",1,[704,709,711],{"class":710},"s7zQu","import",[704,713,715],{"class":714},"sMK4o"," {",[704,717,719],{"class":718},"sTEyZ"," createFsDrain",[704,721,722],{"class":714}," }",[704,724,725],{"class":710}," from",[704,727,728],{"class":714}," '",[704,730,732],{"class":731},"sfazB","evlog\u002Ffs",[704,734,735],{"class":714},"'\n",[687,737,25],{"id":738},"quick-start",[605,740,741],{},"No credentials or environment variables needed. Just wire the drain to your framework:",[743,744,745,859,990,1007,1069,1123,1182,1236,1289],"code-group",{},[694,746,749],{"className":696,"code":747,"filename":748,"language":699,"meta":700,"style":700},"\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",[620,750,751,757,776,783,814,850],{"__ignoreMap":700},[704,752,753],{"class":706,"line":707},[704,754,756],{"class":755},"sHwdD","\u002F\u002F server\u002Fplugins\u002Fevlog-drain.ts\n",[704,758,760,762,764,766,768,770,772,774],{"class":706,"line":759},2,[704,761,711],{"class":710},[704,763,715],{"class":714},[704,765,719],{"class":718},[704,767,722],{"class":714},[704,769,725],{"class":710},[704,771,728],{"class":714},[704,773,732],{"class":731},[704,775,735],{"class":714},[704,777,779],{"class":706,"line":778},3,[704,780,782],{"emptyLinePlaceholder":781},true,"\n",[704,784,786,789,792,796,799,801,805,807,811],{"class":706,"line":785},4,[704,787,788],{"class":710},"export",[704,790,791],{"class":710}," default",[704,793,795],{"class":794},"s2Zo4"," defineNitroPlugin",[704,797,798],{"class":718},"(",[704,800,798],{"class":714},[704,802,804],{"class":803},"sHdIc","nitroApp",[704,806,633],{"class":714},[704,808,810],{"class":809},"spNyl"," =>",[704,812,813],{"class":714}," {\n",[704,815,817,820,823,826,828,831,834,837,840,842,845,847],{"class":706,"line":816},5,[704,818,819],{"class":718},"  nitroApp",[704,821,822],{"class":714},".",[704,824,825],{"class":718},"hooks",[704,827,822],{"class":714},[704,829,830],{"class":794},"hook",[704,832,798],{"class":833},"swJcz",[704,835,836],{"class":714},"'",[704,838,839],{"class":731},"evlog:drain",[704,841,836],{"class":714},[704,843,844],{"class":714},",",[704,846,719],{"class":794},[704,848,849],{"class":833},"())\n",[704,851,853,856],{"class":706,"line":852},6,[704,854,855],{"class":714},"}",[704,857,858],{"class":718},")\n",[694,860,862],{"className":696,"code":861,"filename":245,"language":699,"meta":700,"style":700},"\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",[620,863,864,869,889,907,911,950,968,983],{"__ignoreMap":700},[704,865,866],{"class":706,"line":707},[704,867,868],{"class":755},"\u002F\u002F lib\u002Fevlog.ts — Node.js routes only; keep evlog\u002Ffs out of root instrumentation.ts\n",[704,870,871,873,875,878,880,882,884,887],{"class":706,"line":759},[704,872,711],{"class":710},[704,874,715],{"class":714},[704,876,877],{"class":718}," createEvlog",[704,879,722],{"class":714},[704,881,725],{"class":710},[704,883,728],{"class":714},[704,885,886],{"class":731},"evlog\u002Fnext",[704,888,735],{"class":714},[704,890,891,893,895,897,899,901,903,905],{"class":706,"line":778},[704,892,711],{"class":710},[704,894,715],{"class":714},[704,896,719],{"class":718},[704,898,722],{"class":714},[704,900,725],{"class":710},[704,902,728],{"class":714},[704,904,732],{"class":731},[704,906,735],{"class":714},[704,908,909],{"class":706,"line":785},[704,910,782],{"emptyLinePlaceholder":781},[704,912,913,915,918,920,923,925,928,930,933,935,938,940,943,945,947],{"class":706,"line":816},[704,914,788],{"class":710},[704,916,917],{"class":809}," const",[704,919,715],{"class":714},[704,921,922],{"class":718}," withEvlog",[704,924,844],{"class":714},[704,926,927],{"class":718}," useLogger",[704,929,844],{"class":714},[704,931,932],{"class":718}," log",[704,934,844],{"class":714},[704,936,937],{"class":718}," createError ",[704,939,855],{"class":714},[704,941,942],{"class":714}," =",[704,944,877],{"class":794},[704,946,798],{"class":718},[704,948,949],{"class":714},"{\n",[704,951,952,955,958,960,963,965],{"class":706,"line":852},[704,953,954],{"class":833},"  service",[704,956,957],{"class":714},":",[704,959,728],{"class":714},[704,961,962],{"class":731},"my-app",[704,964,836],{"class":714},[704,966,967],{"class":714},",\n",[704,969,971,974,976,978,981],{"class":706,"line":970},7,[704,972,973],{"class":833},"  drain",[704,975,957],{"class":714},[704,977,719],{"class":794},[704,979,980],{"class":718},"()",[704,982,967],{"class":714},[704,984,986,988],{"class":706,"line":985},8,[704,987,855],{"class":714},[704,989,858],{"class":718},[991,992,994,995,998,999,1002,1003,1006],"callout",{"color":993,"icon":13},"info","The FS adapter requires Node.js (",[620,996,997],{},"node:fs","). On the Edge runtime, or when its directory is not writable, it logs a one-time ",[620,1000,1001],{},"[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 ",[620,1004,1005],{},"evlog\u002Fmemory"," or an HTTP adapter for those.",[694,1008,1010],{"className":696,"code":1009,"filename":275,"language":699,"meta":700,"style":700},"import { createFsDrain } from 'evlog\u002Ffs'\n\napp.use(evlog({ drain: createFsDrain() }))\n",[620,1011,1012,1030,1034],{"__ignoreMap":700},[704,1013,1014,1016,1018,1020,1022,1024,1026,1028],{"class":706,"line":707},[704,1015,711],{"class":710},[704,1017,715],{"class":714},[704,1019,719],{"class":718},[704,1021,722],{"class":714},[704,1023,725],{"class":710},[704,1025,728],{"class":714},[704,1027,732],{"class":731},[704,1029,735],{"class":714},[704,1031,1032],{"class":706,"line":759},[704,1033,782],{"emptyLinePlaceholder":781},[704,1035,1036,1039,1041,1044,1046,1049,1051,1054,1057,1059,1061,1064,1066],{"class":706,"line":778},[704,1037,1038],{"class":718},"app",[704,1040,822],{"class":714},[704,1042,1043],{"class":794},"use",[704,1045,798],{"class":718},[704,1047,1048],{"class":794},"evlog",[704,1050,798],{"class":718},[704,1052,1053],{"class":714},"{",[704,1055,1056],{"class":833}," drain",[704,1058,957],{"class":714},[704,1060,719],{"class":794},[704,1062,1063],{"class":718},"() ",[704,1065,855],{"class":714},[704,1067,1068],{"class":718},"))\n",[694,1070,1071],{"className":696,"code":1009,"filename":270,"language":699,"meta":700,"style":700},[620,1072,1073,1091,1095],{"__ignoreMap":700},[704,1074,1075,1077,1079,1081,1083,1085,1087,1089],{"class":706,"line":707},[704,1076,711],{"class":710},[704,1078,715],{"class":714},[704,1080,719],{"class":718},[704,1082,722],{"class":714},[704,1084,725],{"class":710},[704,1086,728],{"class":714},[704,1088,732],{"class":731},[704,1090,735],{"class":714},[704,1092,1093],{"class":706,"line":759},[704,1094,782],{"emptyLinePlaceholder":781},[704,1096,1097,1099,1101,1103,1105,1107,1109,1111,1113,1115,1117,1119,1121],{"class":706,"line":778},[704,1098,1038],{"class":718},[704,1100,822],{"class":714},[704,1102,1043],{"class":794},[704,1104,798],{"class":718},[704,1106,1048],{"class":794},[704,1108,798],{"class":718},[704,1110,1053],{"class":714},[704,1112,1056],{"class":833},[704,1114,957],{"class":714},[704,1116,719],{"class":794},[704,1118,1063],{"class":718},[704,1120,855],{"class":714},[704,1122,1068],{"class":718},[694,1124,1126],{"className":696,"code":1125,"filename":280,"language":699,"meta":700,"style":700},"import { createFsDrain } from 'evlog\u002Ffs'\n\nawait app.register(evlog, { drain: createFsDrain() })\n",[620,1127,1128,1146,1150],{"__ignoreMap":700},[704,1129,1130,1132,1134,1136,1138,1140,1142,1144],{"class":706,"line":707},[704,1131,711],{"class":710},[704,1133,715],{"class":714},[704,1135,719],{"class":718},[704,1137,722],{"class":714},[704,1139,725],{"class":710},[704,1141,728],{"class":714},[704,1143,732],{"class":731},[704,1145,735],{"class":714},[704,1147,1148],{"class":706,"line":759},[704,1149,782],{"emptyLinePlaceholder":781},[704,1151,1152,1155,1158,1160,1163,1166,1168,1170,1172,1174,1176,1178,1180],{"class":706,"line":778},[704,1153,1154],{"class":710},"await",[704,1156,1157],{"class":718}," app",[704,1159,822],{"class":714},[704,1161,1162],{"class":794},"register",[704,1164,1165],{"class":718},"(evlog",[704,1167,844],{"class":714},[704,1169,715],{"class":714},[704,1171,1056],{"class":833},[704,1173,957],{"class":714},[704,1175,719],{"class":794},[704,1177,1063],{"class":718},[704,1179,855],{"class":714},[704,1181,858],{"class":718},[694,1183,1184],{"className":696,"code":1009,"filename":285,"language":699,"meta":700,"style":700},[620,1185,1186,1204,1208],{"__ignoreMap":700},[704,1187,1188,1190,1192,1194,1196,1198,1200,1202],{"class":706,"line":707},[704,1189,711],{"class":710},[704,1191,715],{"class":714},[704,1193,719],{"class":718},[704,1195,722],{"class":714},[704,1197,725],{"class":710},[704,1199,728],{"class":714},[704,1201,732],{"class":731},[704,1203,735],{"class":714},[704,1205,1206],{"class":706,"line":759},[704,1207,782],{"emptyLinePlaceholder":781},[704,1209,1210,1212,1214,1216,1218,1220,1222,1224,1226,1228,1230,1232,1234],{"class":706,"line":778},[704,1211,1038],{"class":718},[704,1213,822],{"class":714},[704,1215,1043],{"class":794},[704,1217,798],{"class":718},[704,1219,1048],{"class":794},[704,1221,798],{"class":718},[704,1223,1053],{"class":714},[704,1225,1056],{"class":833},[704,1227,957],{"class":714},[704,1229,719],{"class":794},[704,1231,1063],{"class":718},[704,1233,855],{"class":714},[704,1235,1068],{"class":718},[694,1237,1239],{"className":696,"code":1238,"filename":265,"language":699,"meta":700,"style":700},"import { createFsDrain } from 'evlog\u002Ffs'\n\nEvlogModule.forRoot({ drain: createFsDrain() })\n",[620,1240,1241,1259,1263],{"__ignoreMap":700},[704,1242,1243,1245,1247,1249,1251,1253,1255,1257],{"class":706,"line":707},[704,1244,711],{"class":710},[704,1246,715],{"class":714},[704,1248,719],{"class":718},[704,1250,722],{"class":714},[704,1252,725],{"class":710},[704,1254,728],{"class":714},[704,1256,732],{"class":731},[704,1258,735],{"class":714},[704,1260,1261],{"class":706,"line":759},[704,1262,782],{"emptyLinePlaceholder":781},[704,1264,1265,1268,1270,1273,1275,1277,1279,1281,1283,1285,1287],{"class":706,"line":778},[704,1266,1267],{"class":718},"EvlogModule",[704,1269,822],{"class":714},[704,1271,1272],{"class":794},"forRoot",[704,1274,798],{"class":718},[704,1276,1053],{"class":714},[704,1278,1056],{"class":833},[704,1280,957],{"class":714},[704,1282,719],{"class":794},[704,1284,1063],{"class":718},[704,1286,855],{"class":714},[704,1288,858],{"class":718},[694,1290,1292],{"className":696,"code":1291,"filename":300,"language":699,"meta":700,"style":700},"import { createFsDrain } from 'evlog\u002Ffs'\n\ninitLogger({ drain: createFsDrain() })\n",[620,1293,1294,1312,1316],{"__ignoreMap":700},[704,1295,1296,1298,1300,1302,1304,1306,1308,1310],{"class":706,"line":707},[704,1297,711],{"class":710},[704,1299,715],{"class":714},[704,1301,719],{"class":718},[704,1303,722],{"class":714},[704,1305,725],{"class":710},[704,1307,728],{"class":714},[704,1309,732],{"class":731},[704,1311,735],{"class":714},[704,1313,1314],{"class":706,"line":759},[704,1315,782],{"emptyLinePlaceholder":781},[704,1317,1318,1321,1323,1325,1327,1329,1331,1333,1335],{"class":706,"line":778},[704,1319,1320],{"class":794},"initLogger",[704,1322,798],{"class":718},[704,1324,1053],{"class":714},[704,1326,1056],{"class":833},[704,1328,957],{"class":714},[704,1330,719],{"class":794},[704,1332,1063],{"class":718},[704,1334,855],{"class":714},[704,1336,858],{"class":718},[605,1338,1339,1340,1342],{},"Logs start appearing in ",[620,1341,622],{}," immediately.",[687,1344,1346],{"id":1345},"where-the-files-land","Where the files land",[694,1348,1354],{"className":1349,"code":1351,"filename":1352,"language":1353,"meta":700},[1350],"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",[620,1355,1351],{"__ignoreMap":700},[605,1357,1358,1359,1362],{},"Each ",[620,1360,1361],{},".jsonl"," file contains one JSON object per line (NDJSON format), making it easy to parse, grep, and stream.",[991,1364,1367,1368,1371,1372,1375,1376,1379],{"color":1365,"icon":1366},"success","i-lucide-git-branch","A ",[620,1369,1370],{},".gitignore"," is automatically created on first write, inside the ",[620,1373,1374],{},".evlog\u002F"," ancestor directory when present or in the configured ",[620,1377,1378],{},"dir"," otherwise. Log files are never committed to version control.",[687,1381,543],{"id":1382},"configuration",[1384,1385,346],"h3",{"id":1386},"options",[1388,1389,1390,1409],"table",{},[1391,1392,1393],"thead",{},[1394,1395,1396,1400,1403,1406],"tr",{},[1397,1398,1399],"th",{},"Option",[1397,1401,1402],{},"Type",[1397,1404,1405],{},"Default",[1397,1407,1408],{},"Description",[1410,1411,1412,1432,1452,1470],"tbody",{},[1394,1413,1414,1419,1424,1429],{},[1415,1416,1417],"td",{},[620,1418,1378],{},[1415,1420,1421],{},[620,1422,1423],{},"string",[1415,1425,1426],{},[620,1427,1428],{},"'.evlog\u002Flogs'",[1415,1430,1431],{},"Directory for log files",[1394,1433,1434,1439,1444,1449],{},[1415,1435,1436],{},[620,1437,1438],{},"maxFiles",[1415,1440,1441],{},[620,1442,1443],{},"number",[1415,1445,1446],{},[620,1447,1448],{},"undefined",[1415,1450,1451],{},"Max files to keep (auto-deletes oldest)",[1394,1453,1454,1459,1463,1467],{},[1415,1455,1456],{},[620,1457,1458],{},"maxSizePerFile",[1415,1460,1461],{},[620,1462,1443],{},[1415,1464,1465],{},[620,1466,1448],{},[1415,1468,1469],{},"Max bytes per file before rotating",[1394,1471,1472,1477,1482,1487],{},[1415,1473,1474],{},[620,1475,1476],{},"pretty",[1415,1478,1479],{},[620,1480,1481],{},"boolean",[1415,1483,1484],{},[620,1485,1486],{},"false",[1415,1488,1489],{},"Pretty-print JSON (multi-line, readable)",[1384,1491,1493],{"id":1492},"examples","Examples",[694,1495,1498],{"className":696,"code":1496,"filename":1497,"language":699,"meta":700,"style":700},"\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",[620,1499,1500,1505,1527,1531,1536,1544,1566,1578,1584,1589,1595,1617,1622,1628],{"__ignoreMap":700},[704,1501,1502],{"class":706,"line":707},[704,1503,1504],{"class":755},"\u002F\u002F Keep only the last 7 days of logs\n",[704,1506,1507,1510,1512,1514,1517,1519,1523,1525],{"class":706,"line":759},[704,1508,1509],{"class":794},"createFsDrain",[704,1511,798],{"class":718},[704,1513,1053],{"class":714},[704,1515,1516],{"class":833}," maxFiles",[704,1518,957],{"class":714},[704,1520,1522],{"class":1521},"sbssI"," 7",[704,1524,722],{"class":714},[704,1526,858],{"class":718},[704,1528,1529],{"class":706,"line":778},[704,1530,782],{"emptyLinePlaceholder":781},[704,1532,1533],{"class":706,"line":785},[704,1534,1535],{"class":755},"\u002F\u002F Rotate files at 10MB, keep 30 files\n",[704,1537,1538,1540,1542],{"class":706,"line":816},[704,1539,1509],{"class":794},[704,1541,798],{"class":718},[704,1543,949],{"class":714},[704,1545,1546,1549,1551,1554,1557,1560,1562,1564],{"class":706,"line":852},[704,1547,1548],{"class":833},"  maxSizePerFile",[704,1550,957],{"class":714},[704,1552,1553],{"class":1521}," 10",[704,1555,1556],{"class":714}," *",[704,1558,1559],{"class":1521}," 1024",[704,1561,1556],{"class":714},[704,1563,1559],{"class":1521},[704,1565,967],{"class":714},[704,1567,1568,1571,1573,1576],{"class":706,"line":970},[704,1569,1570],{"class":833},"  maxFiles",[704,1572,957],{"class":714},[704,1574,1575],{"class":1521}," 30",[704,1577,967],{"class":714},[704,1579,1580,1582],{"class":706,"line":985},[704,1581,855],{"class":714},[704,1583,858],{"class":718},[704,1585,1587],{"class":706,"line":1586},9,[704,1588,782],{"emptyLinePlaceholder":781},[704,1590,1592],{"class":706,"line":1591},10,[704,1593,1594],{"class":755},"\u002F\u002F Pretty-print for human reading\n",[704,1596,1598,1600,1602,1604,1607,1609,1613,1615],{"class":706,"line":1597},11,[704,1599,1509],{"class":794},[704,1601,798],{"class":718},[704,1603,1053],{"class":714},[704,1605,1606],{"class":833}," pretty",[704,1608,957],{"class":714},[704,1610,1612],{"class":1611},"sfNiH"," true",[704,1614,722],{"class":714},[704,1616,858],{"class":718},[704,1618,1620],{"class":706,"line":1619},12,[704,1621,782],{"emptyLinePlaceholder":781},[704,1623,1625],{"class":706,"line":1624},13,[704,1626,1627],{"class":755},"\u002F\u002F Custom directory\n",[704,1629,1631,1633,1635,1637,1640,1642,1644,1647,1649,1651],{"class":706,"line":1630},14,[704,1632,1509],{"class":794},[704,1634,798],{"class":718},[704,1636,1053],{"class":714},[704,1638,1639],{"class":833}," dir",[704,1641,957],{"class":714},[704,1643,728],{"class":714},[704,1645,1646],{"class":731},"\u002Fvar\u002Flog\u002Fmyapp",[704,1648,836],{"class":714},[704,1650,722],{"class":714},[704,1652,858],{"class":718},[1384,1654,1656],{"id":1655},"rotate-by-size-or-by-day","Rotate by size or by day",[605,1658,1659,1660,1663,1664,1666],{},"By default, a new file is created each day (",[620,1661,1662],{},"2026-03-14.jsonl","). When ",[620,1665,1458],{}," is set, the adapter creates suffixed files when the current file exceeds the limit:",[694,1668,1672],{"className":1669,"code":1670,"filename":1671,"language":1353,"meta":700},[1350],".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",[620,1673,1670],{"__ignoreMap":700},[1384,1675,1677],{"id":1676},"delete-old-files-on-a-schedule","Delete old files on a schedule",[605,1679,1680,1681,1683,1684,1686],{},"When ",[620,1682,1438],{}," is set, the adapter automatically deletes the oldest ",[620,1685,1361],{}," files after each write, keeping only the most recent files.",[687,1688,1690],{"id":1689},"write-to-disk-and-ship-to-a-service","Write to disk and ship to a service",[605,1692,1693],{},"Use the FS adapter alongside a network drain for local backup:",[694,1695,1697],{"className":696,"code":1696,"filename":1497,"language":699,"meta":700,"style":700},"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",[620,1698,1699,1717,1737,1741,1768,1782,1786,1810,1848],{"__ignoreMap":700},[704,1700,1701,1703,1705,1707,1709,1711,1713,1715],{"class":706,"line":707},[704,1702,711],{"class":710},[704,1704,715],{"class":714},[704,1706,719],{"class":718},[704,1708,722],{"class":714},[704,1710,725],{"class":710},[704,1712,728],{"class":714},[704,1714,732],{"class":731},[704,1716,735],{"class":714},[704,1718,1719,1721,1723,1726,1728,1730,1732,1735],{"class":706,"line":759},[704,1720,711],{"class":710},[704,1722,715],{"class":714},[704,1724,1725],{"class":718}," createAxiomDrain",[704,1727,722],{"class":714},[704,1729,725],{"class":710},[704,1731,728],{"class":714},[704,1733,1734],{"class":731},"evlog\u002Faxiom",[704,1736,735],{"class":714},[704,1738,1739],{"class":706,"line":778},[704,1740,782],{"emptyLinePlaceholder":781},[704,1742,1743,1746,1749,1752,1754,1756,1758,1760,1762,1764,1766],{"class":706,"line":785},[704,1744,1745],{"class":809},"const",[704,1747,1748],{"class":718}," fs ",[704,1750,1751],{"class":714},"=",[704,1753,719],{"class":794},[704,1755,798],{"class":718},[704,1757,1053],{"class":714},[704,1759,1516],{"class":833},[704,1761,957],{"class":714},[704,1763,1522],{"class":1521},[704,1765,722],{"class":714},[704,1767,858],{"class":718},[704,1769,1770,1772,1775,1777,1779],{"class":706,"line":816},[704,1771,1745],{"class":809},[704,1773,1774],{"class":718}," axiom ",[704,1776,1751],{"class":714},[704,1778,1725],{"class":794},[704,1780,1781],{"class":718},"()\n",[704,1783,1784],{"class":706,"line":852},[704,1785,782],{"emptyLinePlaceholder":781},[704,1787,1788,1790,1793,1795,1798,1801,1804,1806,1808],{"class":706,"line":970},[704,1789,1745],{"class":809},[704,1791,1792],{"class":718}," drain ",[704,1794,1751],{"class":714},[704,1796,1797],{"class":809}," async",[704,1799,1800],{"class":714}," (",[704,1802,1803],{"class":803},"ctx",[704,1805,633],{"class":714},[704,1807,810],{"class":809},[704,1809,813],{"class":714},[704,1811,1812,1815,1819,1821,1824,1827,1830,1832,1834,1836,1838,1841,1843,1845],{"class":706,"line":985},[704,1813,1814],{"class":710},"  await",[704,1816,1818],{"class":1817},"sBMFI"," Promise",[704,1820,822],{"class":714},[704,1822,1823],{"class":794},"allSettled",[704,1825,1826],{"class":833},"([",[704,1828,1829],{"class":794},"fs",[704,1831,798],{"class":833},[704,1833,1803],{"class":718},[704,1835,633],{"class":833},[704,1837,844],{"class":714},[704,1839,1840],{"class":794}," axiom",[704,1842,798],{"class":833},[704,1844,1803],{"class":718},[704,1846,1847],{"class":833},")])\n",[704,1849,1850],{"class":706,"line":1586},[704,1851,1852],{"class":714},"}\n",[687,1854,1856],{"id":1855},"read-back-what-you-wrote","Read back what you wrote",[1384,1858,1860],{"id":1859},"stream-in-real-time","Stream in real-time",[694,1862,1867],{"className":1863,"code":1864,"filename":1865,"language":1866,"meta":700,"style":700},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","tail -f .evlog\u002Flogs\u002F2026-03-14.jsonl\n","Terminal","bash",[620,1868,1869],{"__ignoreMap":700},[704,1870,1871,1874,1877],{"class":706,"line":707},[704,1872,1873],{"class":1817},"tail",[704,1875,1876],{"class":731}," -f",[704,1878,1879],{"class":731}," .evlog\u002Flogs\u002F2026-03-14.jsonl\n",[1384,1881,1883],{"id":1882},"search-with-jq","Search with jq",[694,1885,1887],{"className":1863,"code":1886,"filename":1865,"language":1866,"meta":700,"style":700},"# 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",[620,1888,1889,1894,1915,1919,1924,1941,1945,1950],{"__ignoreMap":700},[704,1890,1891],{"class":706,"line":707},[704,1892,1893],{"class":755},"# Find errors\n",[704,1895,1896,1899,1902,1905,1908,1910,1913],{"class":706,"line":759},[704,1897,1898],{"class":1817},"cat",[704,1900,1901],{"class":731}," .evlog\u002Flogs\u002F2026-03-14.jsonl",[704,1903,1904],{"class":714}," |",[704,1906,1907],{"class":1817}," jq",[704,1909,728],{"class":714},[704,1911,1912],{"class":731},"select(.level == \"error\")",[704,1914,735],{"class":714},[704,1916,1917],{"class":706,"line":778},[704,1918,782],{"emptyLinePlaceholder":781},[704,1920,1921],{"class":706,"line":785},[704,1922,1923],{"class":755},"# Slow requests (over 1s)\n",[704,1925,1926,1928,1930,1932,1934,1936,1939],{"class":706,"line":816},[704,1927,1898],{"class":1817},[704,1929,1901],{"class":731},[704,1931,1904],{"class":714},[704,1933,1907],{"class":1817},[704,1935,728],{"class":714},[704,1937,1938],{"class":731},"select(.durationMs > 1000)",[704,1940,735],{"class":714},[704,1942,1943],{"class":706,"line":852},[704,1944,782],{"emptyLinePlaceholder":781},[704,1946,1947],{"class":706,"line":970},[704,1948,1949],{"class":755},"# Requests by path\n",[704,1951,1952,1954,1956,1958,1960,1962,1965],{"class":706,"line":985},[704,1953,1898],{"class":1817},[704,1955,1901],{"class":731},[704,1957,1904],{"class":714},[704,1959,1907],{"class":1817},[704,1961,728],{"class":714},[704,1963,1964],{"class":731},"select(.path == \"\u002Fapi\u002Fcheckout\")",[704,1966,735],{"class":714},[1384,1968,1970],{"id":1969},"search-with-grep","Search with grep",[694,1972,1974],{"className":1863,"code":1973,"filename":1865,"language":1866,"meta":700,"style":700},"# 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",[620,1975,1976,1981,1995,1999,2004],{"__ignoreMap":700},[704,1977,1978],{"class":706,"line":707},[704,1979,1980],{"class":755},"# Find all errors\n",[704,1982,1983,1986,1988,1991,1993],{"class":706,"line":759},[704,1984,1985],{"class":1817},"grep",[704,1987,728],{"class":714},[704,1989,1990],{"class":731},"\"level\":\"error\"",[704,1992,836],{"class":714},[704,1994,1879],{"class":731},[704,1996,1997],{"class":706,"line":778},[704,1998,782],{"emptyLinePlaceholder":781},[704,2000,2001],{"class":706,"line":785},[704,2002,2003],{"class":755},"# Find by request ID\n",[704,2005,2006,2008,2010,2013,2015,2018,2021],{"class":706,"line":816},[704,2007,1985],{"class":1817},[704,2009,728],{"class":714},[704,2011,2012],{"class":731},"req_abc123",[704,2014,836],{"class":714},[704,2016,2017],{"class":731}," .evlog\u002Flogs\u002F",[704,2019,2020],{"class":718},"*",[704,2022,2023],{"class":731},".jsonl\n",[687,2025,2027],{"id":2026},"call-the-drain-without-a-framework","Call the drain without a framework",[605,2029,2030],{},"For advanced use cases, use the lower-level write functions:",[694,2032,2034],{"className":696,"code":2033,"filename":698,"language":699,"meta":700,"style":700},"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",[620,2035,2036,2060,2064,2077,2093,2105,2111,2115,2128,2142,2152],{"__ignoreMap":700},[704,2037,2038,2040,2042,2045,2047,2050,2052,2054,2056,2058],{"class":706,"line":707},[704,2039,711],{"class":710},[704,2041,715],{"class":714},[704,2043,2044],{"class":718}," writeToFs",[704,2046,844],{"class":714},[704,2048,2049],{"class":718}," writeBatchToFs",[704,2051,722],{"class":714},[704,2053,725],{"class":710},[704,2055,728],{"class":714},[704,2057,732],{"class":731},[704,2059,735],{"class":714},[704,2061,2062],{"class":706,"line":759},[704,2063,782],{"emptyLinePlaceholder":781},[704,2065,2066,2068,2070,2073,2075],{"class":706,"line":778},[704,2067,1154],{"class":710},[704,2069,2044],{"class":794},[704,2071,2072],{"class":718},"(event",[704,2074,844],{"class":714},[704,2076,813],{"class":714},[704,2078,2079,2082,2084,2086,2089,2091],{"class":706,"line":785},[704,2080,2081],{"class":833},"  dir",[704,2083,957],{"class":714},[704,2085,728],{"class":714},[704,2087,2088],{"class":731},".evlog\u002Flogs",[704,2090,836],{"class":714},[704,2092,967],{"class":714},[704,2094,2095,2098,2100,2103],{"class":706,"line":816},[704,2096,2097],{"class":833},"  pretty",[704,2099,957],{"class":714},[704,2101,2102],{"class":1611}," false",[704,2104,967],{"class":714},[704,2106,2107,2109],{"class":706,"line":852},[704,2108,855],{"class":714},[704,2110,858],{"class":718},[704,2112,2113],{"class":706,"line":970},[704,2114,782],{"emptyLinePlaceholder":781},[704,2116,2117,2119,2121,2124,2126],{"class":706,"line":985},[704,2118,1154],{"class":710},[704,2120,2049],{"class":794},[704,2122,2123],{"class":718},"(events",[704,2125,844],{"class":714},[704,2127,813],{"class":714},[704,2129,2130,2132,2134,2136,2138,2140],{"class":706,"line":1586},[704,2131,2081],{"class":833},[704,2133,957],{"class":714},[704,2135,728],{"class":714},[704,2137,2088],{"class":731},[704,2139,836],{"class":714},[704,2141,967],{"class":714},[704,2143,2144,2146,2148,2150],{"class":706,"line":1591},[704,2145,2097],{"class":833},[704,2147,957],{"class":714},[704,2149,2102],{"class":1611},[704,2151,967],{"class":714},[704,2153,2154,2156],{"class":706,"line":1597},[704,2155,855],{"class":714},[704,2157,858],{"class":718},[687,2159,2161],{"id":2160},"hand-the-file-to-an-agent","Hand the file to an agent",[605,2163,2164,2165,2171],{},"The file system drain pairs with the ",[676,2166,2167,2170],{"href":566},[620,2168,2169],{},"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.",[687,2173,2175],{"id":2174},"next-steps","Next Steps",[609,2177,2178,2183,2189,2195],{},[612,2179,2180,2182],{},[676,2181,565],{"href":566}," - Let AI analyze your logs",[612,2184,2185,2188],{},[676,2186,2187],{"href":162},"Axiom Adapter"," - Send logs to Axiom for querying and dashboards",[612,2190,2191,2194],{},[676,2192,2193],{"href":531},"Pipeline"," - Add batching and retry to any drain",[612,2196,2197,2200],{},[676,2198,2199],{"href":526},"Custom Adapters"," - Build your own adapter",[2202,2203,2204],"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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