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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":596,"path":597,"stem":598,"icon":572},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":600,"path":601,"stem":602,"icon":572},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":604,"path":605,"stem":606,"icon":572},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":608,"title":508,"body":609,"description":1311,"extension":1312,"links":1313,"meta":1314,"navigation":1315,"path":509,"seo":1316,"stem":510,"__hash__":1317},"docs\u002F6.extend\u002F2.fs-reader.md",{"type":610,"value":611,"toc":1302},"minimark",[612,647,650,724,729,897,903,907,1008,1011,1015,1185,1195,1199,1257,1266,1270,1298],[613,614,615,616,620,621,625,626,629,630,633,634,637,638,641,642,646],"p",{},"The ",[617,618,619],"a",{"href":222},"filesystem drain"," writes wide events as NDJSON to ",[622,623,624],"code",{},".jsonl"," files under ",[622,627,628],{},".evlog\u002Flogs\u002F"," (one file per day, e.g. ",[622,631,632],{},"2026-05-08.jsonl",", plus rotation suffixes like ",[622,635,636],{},".1.jsonl"," when size-based rotation is enabled). The ",[622,639,640],{},"evlog\u002Ffs"," module also ships ",[643,644,645],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[648,649],"ndjson-tail",{},[651,652,655,658,716],"prompt",{":actions":653,"description":654,"icon":511},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[613,656,657],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[659,660,661,672,685,695,713],"ul",{},[662,663,664,665,667,668,671],"li",{},"Confirm the filesystem drain is wired up (",[622,666,640],{}," adapter writing NDJSON to ",[622,669,670],{},".evlog\u002Flogs\u002F*.jsonl",")",[662,673,674,675,678,679,681,682],{},"For replay: import ",[622,676,677],{},"readFsLogs"," from ",[622,680,640],{}," and iterate ",[622,683,684],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[662,686,687,688,691,692],{},"For follow mode: import ",[622,689,690],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[622,693,694],{},"AbortSignal",[662,696,697,698,701,702,701,705,708,709,712],{},"Apply filters at read time (",[622,699,700],{},"level",", ",[622,703,704],{},"since",[622,706,707],{},"until",", custom ",[622,710,711],{},"filter"," predicate) instead of post-processing",[662,714,715],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[613,717,718,719],{},"Docs: ",[617,720,721],{"href":721,"rel":722},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[723],"nofollow",[725,726,728],"h2",{"id":727},"replay-history","Replay history",[730,731,736],"pre",{"className":732,"code":733,"language":734,"meta":735,"style":735},"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","",[622,737,738,770,777,846,891],{"__ignoreMap":735},[739,740,743,747,751,755,758,761,764,767],"span",{"class":741,"line":742},"line",1,[739,744,746],{"class":745},"s7zQu","import",[739,748,750],{"class":749},"sMK4o"," {",[739,752,754],{"class":753},"sTEyZ"," readFsLogs",[739,756,757],{"class":749}," }",[739,759,760],{"class":745}," from",[739,762,763],{"class":749}," '",[739,765,640],{"class":766},"sfazB",[739,768,769],{"class":749},"'\n",[739,771,773],{"class":741,"line":772},2,[739,774,776],{"emptyLinePlaceholder":775},true,"\n",[739,778,780,783,786,789,793,796,799,802,805,808,812,815,817,820,823,826,829,831,833,836,838,840,843],{"class":741,"line":779},3,[739,781,782],{"class":745},"for",[739,784,785],{"class":745}," await",[739,787,788],{"class":753}," (",[739,790,792],{"class":791},"spNyl","const",[739,794,795],{"class":753}," event ",[739,797,798],{"class":749},"of",[739,800,754],{"class":801},"s2Zo4",[739,803,804],{"class":753},"(",[739,806,807],{"class":749},"{",[739,809,811],{"class":810},"swJcz"," since",[739,813,814],{"class":749},":",[739,816,763],{"class":749},[739,818,819],{"class":766},"2026-03-01",[739,821,822],{"class":749},"'",[739,824,825],{"class":749},",",[739,827,828],{"class":810}," level",[739,830,814],{"class":749},[739,832,763],{"class":749},[739,834,835],{"class":766},"error",[739,837,822],{"class":749},[739,839,757],{"class":749},[739,841,842],{"class":753},")) ",[739,844,845],{"class":749},"{\n",[739,847,849,852,855,858,860,863,865,868,870,873,875,878,881,883,885,888],{"class":741,"line":848},4,[739,850,851],{"class":753},"  console",[739,853,854],{"class":749},".",[739,856,857],{"class":801},"log",[739,859,804],{"class":810},[739,861,862],{"class":753},"event",[739,864,854],{"class":749},[739,866,867],{"class":753},"timestamp",[739,869,825],{"class":749},[739,871,872],{"class":753}," event",[739,874,854],{"class":749},[739,876,877],{"class":753},"action",[739,879,880],{"class":749}," ??",[739,882,872],{"class":753},[739,884,854],{"class":749},[739,886,887],{"class":753},"message",[739,889,890],{"class":810},")\n",[739,892,894],{"class":741,"line":893},5,[739,895,896],{"class":749},"}\n",[613,898,899,902],{},[622,900,901],{},"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.",[904,905,351],"h3",{"id":906},"options",[908,909,910,926],"table",{},[911,912,913],"thead",{},[914,915,916,920,923],"tr",{},[917,918,919],"th",{},"Option",[917,921,922],{},"Type",[917,924,925],{},"Description",[927,928,929,948,965,980,994],"tbody",{},[914,930,931,937,942],{},[932,933,934],"td",{},[622,935,936],{},"dir",[932,938,939],{},[622,940,941],{},"string",[932,943,944,945,854],{},"Directory to read from. Default: ",[622,946,947],{},".evlog\u002Flogs",[914,949,950,954,959],{},[932,951,952],{},[622,953,704],{},[932,955,956],{},[622,957,958],{},"Date | string",[932,960,961,962,854],{},"Yield events with ",[622,963,964],{},"timestamp >= since",[914,966,967,971,975],{},[932,968,969],{},[622,970,707],{},[932,972,973],{},[622,974,958],{},[932,976,961,977,854],{},[622,978,979],{},"timestamp \u003C= until",[914,981,982,986,991],{},[932,983,984],{},[622,985,700],{},[932,987,988],{},[622,989,990],{},"LogLevel | LogLevel[]",[932,992,993],{},"Filter by event level.",[914,995,996,1000,1005],{},[932,997,998],{},[622,999,711],{},[932,1001,1002],{},[622,1003,1004],{},"(event) => boolean",[932,1006,1007],{},"Custom predicate.",[613,1009,1010],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[725,1012,1014],{"id":1013},"live-tail","Live tail",[730,1016,1018],{"className":732,"code":1017,"language":734,"meta":735,"style":735},"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",[622,1019,1020,1039,1043,1062,1100,1104,1144,1180],{"__ignoreMap":735},[739,1021,1022,1024,1026,1029,1031,1033,1035,1037],{"class":741,"line":742},[739,1023,746],{"class":745},[739,1025,750],{"class":749},[739,1027,1028],{"class":753}," tailFsLogs",[739,1030,757],{"class":749},[739,1032,760],{"class":745},[739,1034,763],{"class":749},[739,1036,640],{"class":766},[739,1038,769],{"class":749},[739,1040,1041],{"class":741,"line":772},[739,1042,776],{"emptyLinePlaceholder":775},[739,1044,1045,1047,1050,1053,1056,1059],{"class":741,"line":779},[739,1046,792],{"class":791},[739,1048,1049],{"class":753}," ac ",[739,1051,1052],{"class":749},"=",[739,1054,1055],{"class":749}," new",[739,1057,1058],{"class":801}," AbortController",[739,1060,1061],{"class":753},"()\n",[739,1063,1064,1067,1069,1072,1074,1076,1079,1081,1083,1086,1089,1092,1094,1097],{"class":741,"line":848},[739,1065,1066],{"class":753},"process",[739,1068,854],{"class":749},[739,1070,1071],{"class":801},"on",[739,1073,804],{"class":753},[739,1075,822],{"class":749},[739,1077,1078],{"class":766},"SIGINT",[739,1080,822],{"class":749},[739,1082,825],{"class":749},[739,1084,1085],{"class":749}," ()",[739,1087,1088],{"class":791}," =>",[739,1090,1091],{"class":753}," ac",[739,1093,854],{"class":749},[739,1095,1096],{"class":801},"abort",[739,1098,1099],{"class":753},"())\n",[739,1101,1102],{"class":741,"line":893},[739,1103,776],{"emptyLinePlaceholder":775},[739,1105,1107,1109,1111,1113,1115,1117,1119,1121,1123,1125,1128,1130,1132,1134,1137,1140,1142],{"class":741,"line":1106},6,[739,1108,782],{"class":745},[739,1110,785],{"class":745},[739,1112,788],{"class":753},[739,1114,792],{"class":791},[739,1116,795],{"class":753},[739,1118,798],{"class":749},[739,1120,1028],{"class":801},[739,1122,804],{"class":753},[739,1124,807],{"class":749},[739,1126,1127],{"class":810}," signal",[739,1129,814],{"class":749},[739,1131,1091],{"class":753},[739,1133,854],{"class":749},[739,1135,1136],{"class":753},"signal ",[739,1138,1139],{"class":749},"}",[739,1141,842],{"class":753},[739,1143,845],{"class":749},[739,1145,1147,1149,1151,1153,1155,1157,1160,1162,1164,1166,1168,1170,1172,1174,1176,1178],{"class":741,"line":1146},7,[739,1148,851],{"class":753},[739,1150,854],{"class":749},[739,1152,857],{"class":801},[739,1154,804],{"class":810},[739,1156,822],{"class":749},[739,1158,1159],{"class":766},"live:",[739,1161,822],{"class":749},[739,1163,825],{"class":749},[739,1165,872],{"class":753},[739,1167,854],{"class":749},[739,1169,877],{"class":753},[739,1171,880],{"class":749},[739,1173,872],{"class":753},[739,1175,854],{"class":749},[739,1177,887],{"class":753},[739,1179,890],{"class":810},[739,1181,1183],{"class":741,"line":1182},8,[739,1184,896],{"class":749},[613,1186,1187,1190,1191,1194],{},[622,1188,1189],{},"tailFsLogs(options)"," first yields existing events (unless ",[622,1192,1193],{},"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.",[904,1196,1198],{"id":1197},"tail-specific-options","Tail-specific options",[908,1200,1201,1211],{},[911,1202,1203],{},[914,1204,1205,1207,1209],{},[917,1206,919],{},[917,1208,922],{},[917,1210,925],{},[927,1212,1213,1228,1243],{},[914,1214,1215,1220,1225],{},[932,1216,1217],{},[622,1218,1219],{},"pollIntervalMs",[932,1221,1222],{},[622,1223,1224],{},"number",[932,1226,1227],{},"Polling interval. Default: 500ms (minimum 50ms).",[914,1229,1230,1235,1240],{},[932,1231,1232],{},[622,1233,1234],{},"fromEnd",[932,1236,1237],{},[622,1238,1239],{},"boolean",[932,1241,1242],{},"Skip existing events; only yield future ones. Default: false.",[914,1244,1245,1250,1254],{},[932,1246,1247],{},[622,1248,1249],{},"signal",[932,1251,1252],{},[622,1253,694],{},[932,1255,1256],{},"Stop tailing when aborted.",[613,1258,1259,1260,1265],{},"All ",[617,1261,1263],{"href":1262},"#options",[622,1264,677],{}," options also apply.",[725,1267,1269],{"id":1268},"use-cases","Use cases",[659,1271,1272,1278,1281,1291],{},[662,1273,1274,1275,1277],{},"A local Electron \u002F Tauri dashboard reading ",[622,1276,628],{}," from a target project directory",[662,1279,1280],{},"A CI report aggregator that scans logs after a test run",[662,1282,1283,1284,1287,1288],{},"A ",[622,1285,1286],{},"grep","-style CLI that pipes filtered events into ",[622,1289,1290],{},"jq",[662,1292,1293,1294],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[617,1295,1297],{"href":1296},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1299,1300,1301],"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":735,"searchDepth":772,"depth":772,"links":1303},[1304,1307,1310],{"id":727,"depth":772,"text":728,"children":1305},[1306],{"id":906,"depth":779,"text":351},{"id":1013,"depth":772,"text":1014,"children":1308},[1309],{"id":1197,"depth":779,"text":1198},{"id":1268,"depth":772,"text":1269},"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":508,"icon":511},{"title":508,"description":1311},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1319,1321],{"title":504,"path":505,"stem":506,"description":1320,"icon":497,"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":420,"path":513,"stem":514,"description":1322,"icon":515,"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.",1791240222729]