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The ",[525,542,543],{},"evlog\u002Ffs"," module also ships ",[546,547,548],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[551,552],"ndjson-tail",{},[554,555,558,561,619],"prompt",{":actions":556,"description":557,"icon":448},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[516,559,560],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[562,563,564,575,588,598,616],"ul",{},[565,566,567,568,570,571,574],"li",{},"Confirm the filesystem drain is wired up (",[525,569,543],{}," adapter writing NDJSON to ",[525,572,573],{},".evlog\u002Flogs\u002F*.jsonl",")",[565,576,577,578,581,582,584,585],{},"For replay: import ",[525,579,580],{},"readFsLogs"," from ",[525,583,543],{}," and iterate ",[525,586,587],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[565,589,590,591,594,595],{},"For follow mode: import ",[525,592,593],{},"tailFsLogs"," and iterate the same way — it watches for new lines, handles rotation, and accepts an ",[525,596,597],{},"AbortSignal",[565,599,600,601,604,605,604,608,611,612,615],{},"Apply filters at read time (",[525,602,603],{},"level",", ",[525,606,607],{},"since",[525,609,610],{},"until",", custom ",[525,613,614],{},"filter"," predicate) instead of post-processing",[565,617,618],{},"Treat malformed lines as silently skipped (partial writes happen) — never crash the script on a bad line",[516,620,621,622],{},"Docs: ",[520,623,624],{"href":624,"rel":625},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[626],"nofollow",[628,629,631],"h2",{"id":630},"replay-history","Replay history",[633,634,639],"pre",{"className":635,"code":636,"language":637,"meta":638,"style":638},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { readFsLogs } from 'evlog\u002Ffs'\n\nfor await (const event of readFsLogs({ since: '2026-03-01', level: 'error' })) {\n  console.log(event.timestamp, event.action ?? event.message)\n}\n","ts","",[525,640,641,673,680,749,794],{"__ignoreMap":638},[642,643,646,650,654,658,661,664,667,670],"span",{"class":644,"line":645},"line",1,[642,647,649],{"class":648},"s7zQu","import",[642,651,653],{"class":652},"sMK4o"," {",[642,655,657],{"class":656},"sTEyZ"," readFsLogs",[642,659,660],{"class":652}," }",[642,662,663],{"class":648}," from",[642,665,666],{"class":652}," '",[642,668,543],{"class":669},"sfazB",[642,671,672],{"class":652},"'\n",[642,674,676],{"class":644,"line":675},2,[642,677,679],{"emptyLinePlaceholder":678},true,"\n",[642,681,683,686,689,692,696,699,702,705,708,711,715,718,720,723,726,729,732,734,736,739,741,743,746],{"class":644,"line":682},3,[642,684,685],{"class":648},"for",[642,687,688],{"class":648}," await",[642,690,691],{"class":656}," (",[642,693,695],{"class":694},"spNyl","const",[642,697,698],{"class":656}," event ",[642,700,701],{"class":652},"of",[642,703,657],{"class":704},"s2Zo4",[642,706,707],{"class":656},"(",[642,709,710],{"class":652},"{",[642,712,714],{"class":713},"swJcz"," since",[642,716,717],{"class":652},":",[642,719,666],{"class":652},[642,721,722],{"class":669},"2026-03-01",[642,724,725],{"class":652},"'",[642,727,728],{"class":652},",",[642,730,731],{"class":713}," level",[642,733,717],{"class":652},[642,735,666],{"class":652},[642,737,738],{"class":669},"error",[642,740,725],{"class":652},[642,742,660],{"class":652},[642,744,745],{"class":656},")) ",[642,747,748],{"class":652},"{\n",[642,750,752,755,758,761,763,766,768,771,773,776,778,781,784,786,788,791],{"class":644,"line":751},4,[642,753,754],{"class":656},"  console",[642,756,757],{"class":652},".",[642,759,760],{"class":704},"log",[642,762,707],{"class":713},[642,764,765],{"class":656},"event",[642,767,757],{"class":652},[642,769,770],{"class":656},"timestamp",[642,772,728],{"class":652},[642,774,775],{"class":656}," event",[642,777,757],{"class":652},[642,779,780],{"class":656},"action",[642,782,783],{"class":652}," ??",[642,785,775],{"class":656},[642,787,757],{"class":652},[642,789,790],{"class":656},"message",[642,792,793],{"class":713},")\n",[642,795,797],{"class":644,"line":796},5,[642,798,799],{"class":652},"}\n",[516,801,802,805],{},[525,803,804],{},"readFsLogs(options)"," walks the NDJSON files in chronological order, parses them line by line, and yields events that pass all filters. Files outside the date window are skipped entirely.",[807,808,321],"h3",{"id":809},"options",[811,812,813,829],"table",{},[814,815,816],"thead",{},[817,818,819,823,826],"tr",{},[820,821,822],"th",{},"Option",[820,824,825],{},"Type",[820,827,828],{},"Description",[830,831,832,851,868,883,897],"tbody",{},[817,833,834,840,845],{},[835,836,837],"td",{},[525,838,839],{},"dir",[835,841,842],{},[525,843,844],{},"string",[835,846,847,848,757],{},"Directory to read from. Default: ",[525,849,850],{},".evlog\u002Flogs",[817,852,853,857,862],{},[835,854,855],{},[525,856,607],{},[835,858,859],{},[525,860,861],{},"Date | string",[835,863,864,865,757],{},"Yield events with ",[525,866,867],{},"timestamp >= since",[817,869,870,874,878],{},[835,871,872],{},[525,873,610],{},[835,875,876],{},[525,877,861],{},[835,879,864,880,757],{},[525,881,882],{},"timestamp \u003C= until",[817,884,885,889,894],{},[835,886,887],{},[525,888,603],{},[835,890,891],{},[525,892,893],{},"LogLevel | LogLevel[]",[835,895,896],{},"Filter by event level.",[817,898,899,903,908],{},[835,900,901],{},[525,902,614],{},[835,904,905],{},[525,906,907],{},"(event) => boolean",[835,909,910],{},"Custom predicate.",[516,912,913],{},"Malformed lines (partial writes, manual edits) are silently skipped — your script never crashes on a bad line.",[628,915,917],{"id":916},"live-tail","Live tail",[633,919,921],{"className":635,"code":920,"language":637,"meta":638,"style":638},"import { tailFsLogs } from 'evlog\u002Ffs'\n\nconst ac = new AbortController()\nprocess.on('SIGINT', () => ac.abort())\n\nfor await (const event of tailFsLogs({ signal: ac.signal })) {\n  console.log('live:', event.action ?? event.message)\n}\n",[525,922,923,942,946,965,1003,1007,1047,1083],{"__ignoreMap":638},[642,924,925,927,929,932,934,936,938,940],{"class":644,"line":645},[642,926,649],{"class":648},[642,928,653],{"class":652},[642,930,931],{"class":656}," tailFsLogs",[642,933,660],{"class":652},[642,935,663],{"class":648},[642,937,666],{"class":652},[642,939,543],{"class":669},[642,941,672],{"class":652},[642,943,944],{"class":644,"line":675},[642,945,679],{"emptyLinePlaceholder":678},[642,947,948,950,953,956,959,962],{"class":644,"line":682},[642,949,695],{"class":694},[642,951,952],{"class":656}," ac ",[642,954,955],{"class":652},"=",[642,957,958],{"class":652}," new",[642,960,961],{"class":704}," AbortController",[642,963,964],{"class":656},"()\n",[642,966,967,970,972,975,977,979,982,984,986,989,992,995,997,1000],{"class":644,"line":751},[642,968,969],{"class":656},"process",[642,971,757],{"class":652},[642,973,974],{"class":704},"on",[642,976,707],{"class":656},[642,978,725],{"class":652},[642,980,981],{"class":669},"SIGINT",[642,983,725],{"class":652},[642,985,728],{"class":652},[642,987,988],{"class":652}," ()",[642,990,991],{"class":694}," =>",[642,993,994],{"class":656}," ac",[642,996,757],{"class":652},[642,998,999],{"class":704},"abort",[642,1001,1002],{"class":656},"())\n",[642,1004,1005],{"class":644,"line":796},[642,1006,679],{"emptyLinePlaceholder":678},[642,1008,1010,1012,1014,1016,1018,1020,1022,1024,1026,1028,1031,1033,1035,1037,1040,1043,1045],{"class":644,"line":1009},6,[642,1011,685],{"class":648},[642,1013,688],{"class":648},[642,1015,691],{"class":656},[642,1017,695],{"class":694},[642,1019,698],{"class":656},[642,1021,701],{"class":652},[642,1023,931],{"class":704},[642,1025,707],{"class":656},[642,1027,710],{"class":652},[642,1029,1030],{"class":713}," signal",[642,1032,717],{"class":652},[642,1034,994],{"class":656},[642,1036,757],{"class":652},[642,1038,1039],{"class":656},"signal ",[642,1041,1042],{"class":652},"}",[642,1044,745],{"class":656},[642,1046,748],{"class":652},[642,1048,1050,1052,1054,1056,1058,1060,1063,1065,1067,1069,1071,1073,1075,1077,1079,1081],{"class":644,"line":1049},7,[642,1051,754],{"class":656},[642,1053,757],{"class":652},[642,1055,760],{"class":704},[642,1057,707],{"class":713},[642,1059,725],{"class":652},[642,1061,1062],{"class":669},"live:",[642,1064,725],{"class":652},[642,1066,728],{"class":652},[642,1068,775],{"class":656},[642,1070,757],{"class":652},[642,1072,780],{"class":656},[642,1074,783],{"class":652},[642,1076,775],{"class":656},[642,1078,757],{"class":652},[642,1080,790],{"class":656},[642,1082,793],{"class":713},[642,1084,1086],{"class":644,"line":1085},8,[642,1087,799],{"class":652},[516,1089,1090,1093,1094,1097],{},[525,1091,1092],{},"tailFsLogs(options)"," first yields existing events (unless ",[525,1095,1096],{},"fromEnd: true","), then keeps yielding new ones as they're appended — including events written into newly created daily files. Partial writes split across polls are recombined transparently.",[807,1099,1101],{"id":1100},"tail-specific-options","Tail-specific options",[811,1103,1104,1114],{},[814,1105,1106],{},[817,1107,1108,1110,1112],{},[820,1109,822],{},[820,1111,825],{},[820,1113,828],{},[830,1115,1116,1131,1146],{},[817,1117,1118,1123,1128],{},[835,1119,1120],{},[525,1121,1122],{},"pollIntervalMs",[835,1124,1125],{},[525,1126,1127],{},"number",[835,1129,1130],{},"Polling interval. Default: 500ms (minimum 50ms).",[817,1132,1133,1138,1143],{},[835,1134,1135],{},[525,1136,1137],{},"fromEnd",[835,1139,1140],{},[525,1141,1142],{},"boolean",[835,1144,1145],{},"Skip existing events; only yield future ones. Default: false.",[817,1147,1148,1153,1157],{},[835,1149,1150],{},[525,1151,1152],{},"signal",[835,1154,1155],{},[525,1156,597],{},[835,1158,1159],{},"Stop tailing when aborted.",[516,1161,1162,1163,1168],{},"All ",[520,1164,1166],{"href":1165},"#options",[525,1167,580],{}," options also apply.",[628,1170,1172],{"id":1171},"use-cases","Use cases",[562,1174,1175,1181,1184,1194],{},[565,1176,1177,1178,1180],{},"A local Electron \u002F Tauri dashboard reading ",[525,1179,531],{}," from a target project directory",[565,1182,1183],{},"A CI report aggregator that scans logs after a test run",[565,1185,1186,1187,1190,1191],{},"A ",[525,1188,1189],{},"grep","-style CLI that pipes filtered events into ",[525,1192,1193],{},"jq",[565,1195,1196,1197],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[520,1198,1200],{"href":1199},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1202,1203,1204],"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 .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .spNyl, html code.shiki .spNyl{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}",{"title":638,"searchDepth":675,"depth":675,"links":1206},[1207,1210,1213],{"id":630,"depth":675,"text":631,"children":1208},[1209],{"id":809,"depth":682,"text":321},{"id":916,"depth":675,"text":917,"children":1211},[1212],{"id":1100,"depth":682,"text":1101},{"id":1171,"depth":675,"text":1172},"Replay and tail the local NDJSON drain with readFsLogs and tailFsLogs — works in-process or from any external Node tool, survives restarts.","md",null,{},{"title":445,"icon":448},{"title":445,"description":1214},"hip7SEWxeeu5DMPk0t0UWw-70GfCvrAeqjgm7ysLBmE",[1222,1224],{"title":440,"path":441,"stem":442,"description":1223,"icon":443,"children":-1},"Build evlog support for an HTTP framework (or non-HTTP runtime) without a built-in integration. Use defineFrameworkIntegration for the (ctx, next) middleware shape, or createMiddlewareLogger \u002F createRequestLogger for everything else.",{"title":391,"path":450,"stem":451,"description":1225,"icon":452,"children":-1},"Concrete copy-paste recipes — build your own minimal devtool, pipe to curl + jq, replay history then go live, and aggregate on the consumer side.",1785609209404]