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NDJSON to ",[582,583,584],"code",{},".jsonl"," files under ",[582,587,588],{},".evlog\u002Flogs\u002F"," (one file per day, e.g. ",[582,591,592],{},"2026-05-08.jsonl",", plus rotation suffixes like ",[582,595,596],{},".1.jsonl"," when size-based rotation is enabled). 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It watches for new lines, handles rotation, and accepts an ",[582,653,654],{},"AbortSignal",[622,656,657,658,661,662,661,665,668,669,672],{},"Apply filters at read time (",[582,659,660],{},"level",", ",[582,663,664],{},"since",[582,666,667],{},"until",", custom ",[582,670,671],{},"filter"," predicate) instead of post-processing",[622,674,675],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[573,677,678,679],{},"Docs: ",[577,680,681],{"href":681,"rel":682},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[683],"nofollow",[685,686,688],"h2",{"id":687},"replay-history","Replay history",[690,691,696],"pre",{"className":692,"code":693,"language":694,"meta":695,"style":695},"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","",[582,697,698,730,737,806,851],{"__ignoreMap":695},[699,700,703,707,711,715,718,721,724,727],"span",{"class":701,"line":702},"line",1,[699,704,706],{"class":705},"s7zQu","import",[699,708,710],{"class":709},"sMK4o"," {",[699,712,714],{"class":713},"sTEyZ"," readFsLogs",[699,716,717],{"class":709}," }",[699,719,720],{"class":705}," from",[699,722,723],{"class":709}," '",[699,725,600],{"class":726},"sfazB",[699,728,729],{"class":709},"'\n",[699,731,733],{"class":701,"line":732},2,[699,734,736],{"emptyLinePlaceholder":735},true,"\n",[699,738,740,743,746,749,753,756,759,762,765,768,772,775,777,780,783,786,789,791,793,796,798,800,803],{"class":701,"line":739},3,[699,741,742],{"class":705},"for",[699,744,745],{"class":705}," await",[699,747,748],{"class":713}," (",[699,750,752],{"class":751},"spNyl","const",[699,754,755],{"class":713}," event ",[699,757,758],{"class":709},"of",[699,760,714],{"class":761},"s2Zo4",[699,763,764],{"class":713},"(",[699,766,767],{"class":709},"{",[699,769,771],{"class":770},"swJcz"," since",[699,773,774],{"class":709},":",[699,776,723],{"class":709},[699,778,779],{"class":726},"2026-03-01",[699,781,782],{"class":709},"'",[699,784,785],{"class":709},",",[699,787,788],{"class":770}," level",[699,790,774],{"class":709},[699,792,723],{"class":709},[699,794,795],{"class":726},"error",[699,797,782],{"class":709},[699,799,717],{"class":709},[699,801,802],{"class":713},")) ",[699,804,805],{"class":709},"{\n",[699,807,809,812,815,818,820,823,825,828,830,833,835,838,841,843,845,848],{"class":701,"line":808},4,[699,810,811],{"class":713},"  console",[699,813,814],{"class":709},".",[699,816,817],{"class":761},"log",[699,819,764],{"class":770},[699,821,822],{"class":713},"event",[699,824,814],{"class":709},[699,826,827],{"class":713},"timestamp",[699,829,785],{"class":709},[699,831,832],{"class":713}," event",[699,834,814],{"class":709},[699,836,837],{"class":713},"action",[699,839,840],{"class":709}," ??",[699,842,832],{"class":713},[699,844,814],{"class":709},[699,846,847],{"class":713},"message",[699,849,850],{"class":770},")\n",[699,852,854],{"class":701,"line":853},5,[699,855,856],{"class":709},"}\n",[573,858,859,862],{},[582,860,861],{},"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.",[864,865,341],"h3",{"id":866},"options",[868,869,870,886],"table",{},[871,872,873],"thead",{},[874,875,876,880,883],"tr",{},[877,878,879],"th",{},"Option",[877,881,882],{},"Type",[877,884,885],{},"Description",[887,888,889,908,925,940,954],"tbody",{},[874,890,891,897,902],{},[892,893,894],"td",{},[582,895,896],{},"dir",[892,898,899],{},[582,900,901],{},"string",[892,903,904,905,814],{},"Directory to read from. Default: ",[582,906,907],{},".evlog\u002Flogs",[874,909,910,914,919],{},[892,911,912],{},[582,913,664],{},[892,915,916],{},[582,917,918],{},"Date | string",[892,920,921,922,814],{},"Yield events with ",[582,923,924],{},"timestamp >= since",[874,926,927,931,935],{},[892,928,929],{},[582,930,667],{},[892,932,933],{},[582,934,918],{},[892,936,921,937,814],{},[582,938,939],{},"timestamp \u003C= until",[874,941,942,946,951],{},[892,943,944],{},[582,945,660],{},[892,947,948],{},[582,949,950],{},"LogLevel | LogLevel[]",[892,952,953],{},"Filter by event level.",[874,955,956,960,965],{},[892,957,958],{},[582,959,671],{},[892,961,962],{},[582,963,964],{},"(event) => boolean",[892,966,967],{},"Custom predicate.",[573,969,970],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[685,972,974],{"id":973},"live-tail","Live tail",[690,976,978],{"className":692,"code":977,"language":694,"meta":695,"style":695},"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",[582,979,980,999,1003,1022,1060,1064,1104,1140],{"__ignoreMap":695},[699,981,982,984,986,989,991,993,995,997],{"class":701,"line":702},[699,983,706],{"class":705},[699,985,710],{"class":709},[699,987,988],{"class":713}," tailFsLogs",[699,990,717],{"class":709},[699,992,720],{"class":705},[699,994,723],{"class":709},[699,996,600],{"class":726},[699,998,729],{"class":709},[699,1000,1001],{"class":701,"line":732},[699,1002,736],{"emptyLinePlaceholder":735},[699,1004,1005,1007,1010,1013,1016,1019],{"class":701,"line":739},[699,1006,752],{"class":751},[699,1008,1009],{"class":713}," ac ",[699,1011,1012],{"class":709},"=",[699,1014,1015],{"class":709}," new",[699,1017,1018],{"class":761}," AbortController",[699,1020,1021],{"class":713},"()\n",[699,1023,1024,1027,1029,1032,1034,1036,1039,1041,1043,1046,1049,1052,1054,1057],{"class":701,"line":808},[699,1025,1026],{"class":713},"process",[699,1028,814],{"class":709},[699,1030,1031],{"class":761},"on",[699,1033,764],{"class":713},[699,1035,782],{"class":709},[699,1037,1038],{"class":726},"SIGINT",[699,1040,782],{"class":709},[699,1042,785],{"class":709},[699,1044,1045],{"class":709}," ()",[699,1047,1048],{"class":751}," =>",[699,1050,1051],{"class":713}," ac",[699,1053,814],{"class":709},[699,1055,1056],{"class":761},"abort",[699,1058,1059],{"class":713},"())\n",[699,1061,1062],{"class":701,"line":853},[699,1063,736],{"emptyLinePlaceholder":735},[699,1065,1067,1069,1071,1073,1075,1077,1079,1081,1083,1085,1088,1090,1092,1094,1097,1100,1102],{"class":701,"line":1066},6,[699,1068,742],{"class":705},[699,1070,745],{"class":705},[699,1072,748],{"class":713},[699,1074,752],{"class":751},[699,1076,755],{"class":713},[699,1078,758],{"class":709},[699,1080,988],{"class":761},[699,1082,764],{"class":713},[699,1084,767],{"class":709},[699,1086,1087],{"class":770}," signal",[699,1089,774],{"class":709},[699,1091,1051],{"class":713},[699,1093,814],{"class":709},[699,1095,1096],{"class":713},"signal ",[699,1098,1099],{"class":709},"}",[699,1101,802],{"class":713},[699,1103,805],{"class":709},[699,1105,1107,1109,1111,1113,1115,1117,1120,1122,1124,1126,1128,1130,1132,1134,1136,1138],{"class":701,"line":1106},7,[699,1108,811],{"class":713},[699,1110,814],{"class":709},[699,1112,817],{"class":761},[699,1114,764],{"class":770},[699,1116,782],{"class":709},[699,1118,1119],{"class":726},"live:",[699,1121,782],{"class":709},[699,1123,785],{"class":709},[699,1125,832],{"class":713},[699,1127,814],{"class":709},[699,1129,837],{"class":713},[699,1131,840],{"class":709},[699,1133,832],{"class":713},[699,1135,814],{"class":709},[699,1137,847],{"class":713},[699,1139,850],{"class":770},[699,1141,1143],{"class":701,"line":1142},8,[699,1144,856],{"class":709},[573,1146,1147,1150,1151,1154],{},[582,1148,1149],{},"tailFsLogs(options)"," first yields existing events (unless ",[582,1152,1153],{},"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.",[864,1156,1158],{"id":1157},"tail-specific-options","Tail-specific options",[868,1160,1161,1171],{},[871,1162,1163],{},[874,1164,1165,1167,1169],{},[877,1166,879],{},[877,1168,882],{},[877,1170,885],{},[887,1172,1173,1188,1203],{},[874,1174,1175,1180,1185],{},[892,1176,1177],{},[582,1178,1179],{},"pollIntervalMs",[892,1181,1182],{},[582,1183,1184],{},"number",[892,1186,1187],{},"Polling interval. Default: 500ms (minimum 50ms).",[874,1189,1190,1195,1200],{},[892,1191,1192],{},[582,1193,1194],{},"fromEnd",[892,1196,1197],{},[582,1198,1199],{},"boolean",[892,1201,1202],{},"Skip existing events; only yield future ones. Default: false.",[874,1204,1205,1210,1214],{},[892,1206,1207],{},[582,1208,1209],{},"signal",[892,1211,1212],{},[582,1213,654],{},[892,1215,1216],{},"Stop tailing when aborted.",[573,1218,1219,1220,1225],{},"All ",[577,1221,1223],{"href":1222},"#options",[582,1224,637],{}," options also apply.",[685,1227,1229],{"id":1228},"use-cases","Use cases",[619,1231,1232,1238,1241,1251],{},[622,1233,1234,1235,1237],{},"A local Electron \u002F Tauri dashboard reading ",[582,1236,588],{}," from a target project directory",[622,1239,1240],{},"A CI report aggregator that scans logs after a test run",[622,1242,1243,1244,1247,1248],{},"A ",[582,1245,1246],{},"grep","-style CLI that pipes filtered events into ",[582,1249,1250],{},"jq",[622,1252,1253,1254],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[577,1255,1257],{"href":1256},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1259,1260,1261],"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":695,"searchDepth":732,"depth":732,"links":1263},[1264,1267,1270],{"id":687,"depth":732,"text":688,"children":1265},[1266],{"id":866,"depth":739,"text":341},{"id":973,"depth":732,"text":974,"children":1268},[1269],{"id":1157,"depth":739,"text":1158},{"id":1228,"depth":732,"text":1229},"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":468,"icon":471},{"title":468,"description":1271},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1279,1281],{"title":464,"path":465,"stem":466,"description":1280,"icon":457,"children":-1},"Publish every wide event on a node:diagnostics_channel, so a consumer subscribes without importing evlog and Cloudflare can Tail Worker it.",{"title":410,"path":473,"stem":474,"description":1282,"icon":475,"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.",1788966805346]