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The ",[544,561,562],{},"evlog\u002Ffs"," module also ships ",[565,566,567],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[570,571],"ndjson-tail",{},[573,574,577,580,638],"prompt",{":actions":575,"description":576,"icon":463},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[535,578,579],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[581,582,583,594,607,617,635],"ul",{},[584,585,586,587,589,590,593],"li",{},"Confirm the filesystem drain is wired up (",[544,588,562],{}," adapter writing NDJSON to ",[544,591,592],{},".evlog\u002Flogs\u002F*.jsonl",")",[584,595,596,597,600,601,603,604],{},"For replay: import ",[544,598,599],{},"readFsLogs"," from ",[544,602,562],{}," and iterate ",[544,605,606],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[584,608,609,610,613,614],{},"For follow mode: import ",[544,611,612],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[544,615,616],{},"AbortSignal",[584,618,619,620,623,624,623,627,630,631,634],{},"Apply filters at read time (",[544,621,622],{},"level",", ",[544,625,626],{},"since",[544,628,629],{},"until",", custom ",[544,632,633],{},"filter"," predicate) instead of post-processing",[584,636,637],{},"Treat malformed lines as silently skipped (partial writes happen), never crash the script on a bad line",[535,639,640,641],{},"Docs: ",[539,642,643],{"href":643,"rel":644},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[645],"nofollow",[647,648,650],"h2",{"id":649},"replay-history","Replay history",[652,653,658],"pre",{"className":654,"code":655,"language":656,"meta":657,"style":657},"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","",[544,659,660,692,699,768,813],{"__ignoreMap":657},[661,662,665,669,673,677,680,683,686,689],"span",{"class":663,"line":664},"line",1,[661,666,668],{"class":667},"s7zQu","import",[661,670,672],{"class":671},"sMK4o"," {",[661,674,676],{"class":675},"sTEyZ"," readFsLogs",[661,678,679],{"class":671}," }",[661,681,682],{"class":667}," from",[661,684,685],{"class":671}," '",[661,687,562],{"class":688},"sfazB",[661,690,691],{"class":671},"'\n",[661,693,695],{"class":663,"line":694},2,[661,696,698],{"emptyLinePlaceholder":697},true,"\n",[661,700,702,705,708,711,715,718,721,724,727,730,734,737,739,742,745,748,751,753,755,758,760,762,765],{"class":663,"line":701},3,[661,703,704],{"class":667},"for",[661,706,707],{"class":667}," await",[661,709,710],{"class":675}," (",[661,712,714],{"class":713},"spNyl","const",[661,716,717],{"class":675}," event ",[661,719,720],{"class":671},"of",[661,722,676],{"class":723},"s2Zo4",[661,725,726],{"class":675},"(",[661,728,729],{"class":671},"{",[661,731,733],{"class":732},"swJcz"," since",[661,735,736],{"class":671},":",[661,738,685],{"class":671},[661,740,741],{"class":688},"2026-03-01",[661,743,744],{"class":671},"'",[661,746,747],{"class":671},",",[661,749,750],{"class":732}," level",[661,752,736],{"class":671},[661,754,685],{"class":671},[661,756,757],{"class":688},"error",[661,759,744],{"class":671},[661,761,679],{"class":671},[661,763,764],{"class":675},")) ",[661,766,767],{"class":671},"{\n",[661,769,771,774,777,780,782,785,787,790,792,795,797,800,803,805,807,810],{"class":663,"line":770},4,[661,772,773],{"class":675},"  console",[661,775,776],{"class":671},".",[661,778,779],{"class":723},"log",[661,781,726],{"class":732},[661,783,784],{"class":675},"event",[661,786,776],{"class":671},[661,788,789],{"class":675},"timestamp",[661,791,747],{"class":671},[661,793,794],{"class":675}," event",[661,796,776],{"class":671},[661,798,799],{"class":675},"action",[661,801,802],{"class":671}," ??",[661,804,794],{"class":675},[661,806,776],{"class":671},[661,808,809],{"class":675},"message",[661,811,812],{"class":732},")\n",[661,814,816],{"class":663,"line":815},5,[661,817,818],{"class":671},"}\n",[535,820,821,824],{},[544,822,823],{},"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.",[826,827,332],"h3",{"id":828},"options",[830,831,832,848],"table",{},[833,834,835],"thead",{},[836,837,838,842,845],"tr",{},[839,840,841],"th",{},"Option",[839,843,844],{},"Type",[839,846,847],{},"Description",[849,850,851,870,887,902,916],"tbody",{},[836,852,853,859,864],{},[854,855,856],"td",{},[544,857,858],{},"dir",[854,860,861],{},[544,862,863],{},"string",[854,865,866,867,776],{},"Directory to read from. Default: ",[544,868,869],{},".evlog\u002Flogs",[836,871,872,876,881],{},[854,873,874],{},[544,875,626],{},[854,877,878],{},[544,879,880],{},"Date | string",[854,882,883,884,776],{},"Yield events with ",[544,885,886],{},"timestamp >= since",[836,888,889,893,897],{},[854,890,891],{},[544,892,629],{},[854,894,895],{},[544,896,880],{},[854,898,883,899,776],{},[544,900,901],{},"timestamp \u003C= until",[836,903,904,908,913],{},[854,905,906],{},[544,907,622],{},[854,909,910],{},[544,911,912],{},"LogLevel | LogLevel[]",[854,914,915],{},"Filter by event level.",[836,917,918,922,927],{},[854,919,920],{},[544,921,633],{},[854,923,924],{},[544,925,926],{},"(event) => boolean",[854,928,929],{},"Custom predicate.",[535,931,932],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[647,934,936],{"id":935},"live-tail","Live tail",[652,938,940],{"className":654,"code":939,"language":656,"meta":657,"style":657},"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",[544,941,942,961,965,984,1022,1026,1066,1102],{"__ignoreMap":657},[661,943,944,946,948,951,953,955,957,959],{"class":663,"line":664},[661,945,668],{"class":667},[661,947,672],{"class":671},[661,949,950],{"class":675}," tailFsLogs",[661,952,679],{"class":671},[661,954,682],{"class":667},[661,956,685],{"class":671},[661,958,562],{"class":688},[661,960,691],{"class":671},[661,962,963],{"class":663,"line":694},[661,964,698],{"emptyLinePlaceholder":697},[661,966,967,969,972,975,978,981],{"class":663,"line":701},[661,968,714],{"class":713},[661,970,971],{"class":675}," ac ",[661,973,974],{"class":671},"=",[661,976,977],{"class":671}," new",[661,979,980],{"class":723}," AbortController",[661,982,983],{"class":675},"()\n",[661,985,986,989,991,994,996,998,1001,1003,1005,1008,1011,1014,1016,1019],{"class":663,"line":770},[661,987,988],{"class":675},"process",[661,990,776],{"class":671},[661,992,993],{"class":723},"on",[661,995,726],{"class":675},[661,997,744],{"class":671},[661,999,1000],{"class":688},"SIGINT",[661,1002,744],{"class":671},[661,1004,747],{"class":671},[661,1006,1007],{"class":671}," ()",[661,1009,1010],{"class":713}," =>",[661,1012,1013],{"class":675}," ac",[661,1015,776],{"class":671},[661,1017,1018],{"class":723},"abort",[661,1020,1021],{"class":675},"())\n",[661,1023,1024],{"class":663,"line":815},[661,1025,698],{"emptyLinePlaceholder":697},[661,1027,1029,1031,1033,1035,1037,1039,1041,1043,1045,1047,1050,1052,1054,1056,1059,1062,1064],{"class":663,"line":1028},6,[661,1030,704],{"class":667},[661,1032,707],{"class":667},[661,1034,710],{"class":675},[661,1036,714],{"class":713},[661,1038,717],{"class":675},[661,1040,720],{"class":671},[661,1042,950],{"class":723},[661,1044,726],{"class":675},[661,1046,729],{"class":671},[661,1048,1049],{"class":732}," signal",[661,1051,736],{"class":671},[661,1053,1013],{"class":675},[661,1055,776],{"class":671},[661,1057,1058],{"class":675},"signal ",[661,1060,1061],{"class":671},"}",[661,1063,764],{"class":675},[661,1065,767],{"class":671},[661,1067,1069,1071,1073,1075,1077,1079,1082,1084,1086,1088,1090,1092,1094,1096,1098,1100],{"class":663,"line":1068},7,[661,1070,773],{"class":675},[661,1072,776],{"class":671},[661,1074,779],{"class":723},[661,1076,726],{"class":732},[661,1078,744],{"class":671},[661,1080,1081],{"class":688},"live:",[661,1083,744],{"class":671},[661,1085,747],{"class":671},[661,1087,794],{"class":675},[661,1089,776],{"class":671},[661,1091,799],{"class":675},[661,1093,802],{"class":671},[661,1095,794],{"class":675},[661,1097,776],{"class":671},[661,1099,809],{"class":675},[661,1101,812],{"class":732},[661,1103,1105],{"class":663,"line":1104},8,[661,1106,818],{"class":671},[535,1108,1109,1112,1113,1116],{},[544,1110,1111],{},"tailFsLogs(options)"," first yields existing events (unless ",[544,1114,1115],{},"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.",[826,1118,1120],{"id":1119},"tail-specific-options","Tail-specific options",[830,1122,1123,1133],{},[833,1124,1125],{},[836,1126,1127,1129,1131],{},[839,1128,841],{},[839,1130,844],{},[839,1132,847],{},[849,1134,1135,1150,1165],{},[836,1136,1137,1142,1147],{},[854,1138,1139],{},[544,1140,1141],{},"pollIntervalMs",[854,1143,1144],{},[544,1145,1146],{},"number",[854,1148,1149],{},"Polling interval. Default: 500ms (minimum 50ms).",[836,1151,1152,1157,1162],{},[854,1153,1154],{},[544,1155,1156],{},"fromEnd",[854,1158,1159],{},[544,1160,1161],{},"boolean",[854,1163,1164],{},"Skip existing events; only yield future ones. Default: false.",[836,1166,1167,1172,1176],{},[854,1168,1169],{},[544,1170,1171],{},"signal",[854,1173,1174],{},[544,1175,616],{},[854,1177,1178],{},"Stop tailing when aborted.",[535,1180,1181,1182,1187],{},"All ",[539,1183,1185],{"href":1184},"#options",[544,1186,599],{}," options also apply.",[647,1189,1191],{"id":1190},"use-cases","Use cases",[581,1193,1194,1200,1203,1213],{},[584,1195,1196,1197,1199],{},"A local Electron \u002F Tauri dashboard reading ",[544,1198,550],{}," from a target project directory",[584,1201,1202],{},"A CI report aggregator that scans logs after a test run",[584,1204,1205,1206,1209,1210],{},"A ",[544,1207,1208],{},"grep","-style CLI that pipes filtered events into ",[544,1211,1212],{},"jq",[584,1214,1215,1216],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[539,1217,1219],{"href":1218},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1221,1222,1223],"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":657,"searchDepth":694,"depth":694,"links":1225},[1226,1229,1232],{"id":649,"depth":694,"text":650,"children":1227},[1228],{"id":828,"depth":701,"text":332},{"id":935,"depth":694,"text":936,"children":1230},[1231],{"id":1119,"depth":701,"text":1120},{"id":1190,"depth":694,"text":1191},"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":460,"icon":463},{"title":460,"description":1233},"1eTzQyD98sNGsHVnEXAUKKEhAX06ubE_cIOyZVwjalY",[1241,1243],{"title":456,"path":457,"stem":458,"description":1242,"icon":449,"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":403,"path":465,"stem":466,"description":1244,"icon":467,"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.",1786800769274]