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OpenTelemetry","\u002Fcompare\u002Fopentelemetry","8.compare\u002F2.opentelemetry",{"title":591,"path":592,"stem":593,"icon":567},"evlog vs LogTape","\u002Fcompare\u002Flogtape","8.compare\u002F3.logtape",{"title":595,"path":596,"stem":597,"icon":567},"evlog vs Winston: formats and request events","\u002Fcompare\u002Fwinston","8.compare\u002F4.winston",{"title":599,"path":600,"stem":601,"icon":567},"evlog vs Consola: reporters and request context","\u002Fcompare\u002Fconsola","8.compare\u002F5.consola",{"id":603,"title":503,"body":604,"description":1306,"extension":1307,"links":1308,"meta":1309,"navigation":1310,"path":504,"seo":1311,"stem":505,"__hash__":1312},"docs\u002F6.extend\u002F2.fs-reader.md",{"type":605,"value":606,"toc":1297},"minimark",[607,642,645,719,724,892,898,902,1003,1006,1010,1180,1190,1194,1252,1261,1265,1293],[608,609,610,611,615,616,620,621,624,625,628,629,632,633,636,637,641],"p",{},"The ",[612,613,614],"a",{"href":217},"filesystem drain"," writes wide events as NDJSON to ",[617,618,619],"code",{},".jsonl"," files under ",[617,622,623],{},".evlog\u002Flogs\u002F"," (one file per day, e.g. ",[617,626,627],{},"2026-05-08.jsonl",", plus rotation suffixes like ",[617,630,631],{},".1.jsonl"," when size-based rotation is enabled). The ",[617,634,635],{},"evlog\u002Ffs"," module also ships ",[638,639,640],"strong",{},"readers"," that let any Node tool replay or follow that history without hooking into the running app.",[643,644],"ndjson-tail",{},[646,647,650,653,711],"prompt",{":actions":648,"description":649,"icon":506},"[\"copy\",\"cursor\",\"claude\"]","Read or tail evlog NDJSON logs from disk",[608,651,652],{},"Build a script that consumes evlog's local NDJSON history (no app hook required).",[654,655,656,667,680,690,708],"ul",{},[657,658,659,660,662,663,666],"li",{},"Confirm the filesystem drain is wired up (",[617,661,635],{}," adapter writing NDJSON to ",[617,664,665],{},".evlog\u002Flogs\u002F*.jsonl",")",[657,668,669,670,673,674,676,677],{},"For replay: import ",[617,671,672],{},"readFsLogs"," from ",[617,675,635],{}," and iterate ",[617,678,679],{},"for await (const event of readFsLogs({ since, until, level, filter }))",[657,681,682,683,686,687],{},"For follow mode: import ",[617,684,685],{},"tailFsLogs"," and iterate the same way. It watches for new lines, handles rotation, and accepts an ",[617,688,689],{},"AbortSignal",[657,691,692,693,696,697,696,700,703,704,707],{},"Apply filters at read time (",[617,694,695],{},"level",", ",[617,698,699],{},"since",[617,701,702],{},"until",", custom ",[617,705,706],{},"filter"," predicate) instead of post-processing",[657,709,710],{},"Treat malformed lines as silently skipped (partial writes happen), and never crash the script on a bad line",[608,712,713,714],{},"Docs: ",[612,715,716],{"href":716,"rel":717},"https:\u002F\u002Fwww.evlog.dev\u002Fextend\u002Ffs-reader",[718],"nofollow",[720,721,723],"h2",{"id":722},"replay-history","Replay history",[725,726,731],"pre",{"className":727,"code":728,"language":729,"meta":730,"style":730},"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","",[617,732,733,765,772,841,886],{"__ignoreMap":730},[734,735,738,742,746,750,753,756,759,762],"span",{"class":736,"line":737},"line",1,[734,739,741],{"class":740},"s7zQu","import",[734,743,745],{"class":744},"sMK4o"," {",[734,747,749],{"class":748},"sTEyZ"," readFsLogs",[734,751,752],{"class":744}," }",[734,754,755],{"class":740}," from",[734,757,758],{"class":744}," '",[734,760,635],{"class":761},"sfazB",[734,763,764],{"class":744},"'\n",[734,766,768],{"class":736,"line":767},2,[734,769,771],{"emptyLinePlaceholder":770},true,"\n",[734,773,775,778,781,784,788,791,794,797,800,803,807,810,812,815,818,821,824,826,828,831,833,835,838],{"class":736,"line":774},3,[734,776,777],{"class":740},"for",[734,779,780],{"class":740}," await",[734,782,783],{"class":748}," (",[734,785,787],{"class":786},"spNyl","const",[734,789,790],{"class":748}," event ",[734,792,793],{"class":744},"of",[734,795,749],{"class":796},"s2Zo4",[734,798,799],{"class":748},"(",[734,801,802],{"class":744},"{",[734,804,806],{"class":805},"swJcz"," since",[734,808,809],{"class":744},":",[734,811,758],{"class":744},[734,813,814],{"class":761},"2026-03-01",[734,816,817],{"class":744},"'",[734,819,820],{"class":744},",",[734,822,823],{"class":805}," level",[734,825,809],{"class":744},[734,827,758],{"class":744},[734,829,830],{"class":761},"error",[734,832,817],{"class":744},[734,834,752],{"class":744},[734,836,837],{"class":748},")) ",[734,839,840],{"class":744},"{\n",[734,842,844,847,850,853,855,858,860,863,865,868,870,873,876,878,880,883],{"class":736,"line":843},4,[734,845,846],{"class":748},"  console",[734,848,849],{"class":744},".",[734,851,852],{"class":796},"log",[734,854,799],{"class":805},[734,856,857],{"class":748},"event",[734,859,849],{"class":744},[734,861,862],{"class":748},"timestamp",[734,864,820],{"class":744},[734,866,867],{"class":748}," event",[734,869,849],{"class":744},[734,871,872],{"class":748},"action",[734,874,875],{"class":744}," ??",[734,877,867],{"class":748},[734,879,849],{"class":744},[734,881,882],{"class":748},"message",[734,884,885],{"class":805},")\n",[734,887,889],{"class":736,"line":888},5,[734,890,891],{"class":744},"}\n",[608,893,894,897],{},[617,895,896],{},"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.",[899,900,346],"h3",{"id":901},"options",[903,904,905,921],"table",{},[906,907,908],"thead",{},[909,910,911,915,918],"tr",{},[912,913,914],"th",{},"Option",[912,916,917],{},"Type",[912,919,920],{},"Description",[922,923,924,943,960,975,989],"tbody",{},[909,925,926,932,937],{},[927,928,929],"td",{},[617,930,931],{},"dir",[927,933,934],{},[617,935,936],{},"string",[927,938,939,940,849],{},"Directory to read from. Default: ",[617,941,942],{},".evlog\u002Flogs",[909,944,945,949,954],{},[927,946,947],{},[617,948,699],{},[927,950,951],{},[617,952,953],{},"Date | string",[927,955,956,957,849],{},"Yield events with ",[617,958,959],{},"timestamp >= since",[909,961,962,966,970],{},[927,963,964],{},[617,965,702],{},[927,967,968],{},[617,969,953],{},[927,971,956,972,849],{},[617,973,974],{},"timestamp \u003C= until",[909,976,977,981,986],{},[927,978,979],{},[617,980,695],{},[927,982,983],{},[617,984,985],{},"LogLevel | LogLevel[]",[927,987,988],{},"Filter by event level.",[909,990,991,995,1000],{},[927,992,993],{},[617,994,706],{},[927,996,997],{},[617,998,999],{},"(event) => boolean",[927,1001,1002],{},"Custom predicate.",[608,1004,1005],{},"Malformed lines (partial writes, manual edits) are silently skipped, so your script never crashes on a bad line.",[720,1007,1009],{"id":1008},"live-tail","Live tail",[725,1011,1013],{"className":727,"code":1012,"language":729,"meta":730,"style":730},"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",[617,1014,1015,1034,1038,1057,1095,1099,1139,1175],{"__ignoreMap":730},[734,1016,1017,1019,1021,1024,1026,1028,1030,1032],{"class":736,"line":737},[734,1018,741],{"class":740},[734,1020,745],{"class":744},[734,1022,1023],{"class":748}," tailFsLogs",[734,1025,752],{"class":744},[734,1027,755],{"class":740},[734,1029,758],{"class":744},[734,1031,635],{"class":761},[734,1033,764],{"class":744},[734,1035,1036],{"class":736,"line":767},[734,1037,771],{"emptyLinePlaceholder":770},[734,1039,1040,1042,1045,1048,1051,1054],{"class":736,"line":774},[734,1041,787],{"class":786},[734,1043,1044],{"class":748}," ac ",[734,1046,1047],{"class":744},"=",[734,1049,1050],{"class":744}," new",[734,1052,1053],{"class":796}," AbortController",[734,1055,1056],{"class":748},"()\n",[734,1058,1059,1062,1064,1067,1069,1071,1074,1076,1078,1081,1084,1087,1089,1092],{"class":736,"line":843},[734,1060,1061],{"class":748},"process",[734,1063,849],{"class":744},[734,1065,1066],{"class":796},"on",[734,1068,799],{"class":748},[734,1070,817],{"class":744},[734,1072,1073],{"class":761},"SIGINT",[734,1075,817],{"class":744},[734,1077,820],{"class":744},[734,1079,1080],{"class":744}," ()",[734,1082,1083],{"class":786}," =>",[734,1085,1086],{"class":748}," ac",[734,1088,849],{"class":744},[734,1090,1091],{"class":796},"abort",[734,1093,1094],{"class":748},"())\n",[734,1096,1097],{"class":736,"line":888},[734,1098,771],{"emptyLinePlaceholder":770},[734,1100,1102,1104,1106,1108,1110,1112,1114,1116,1118,1120,1123,1125,1127,1129,1132,1135,1137],{"class":736,"line":1101},6,[734,1103,777],{"class":740},[734,1105,780],{"class":740},[734,1107,783],{"class":748},[734,1109,787],{"class":786},[734,1111,790],{"class":748},[734,1113,793],{"class":744},[734,1115,1023],{"class":796},[734,1117,799],{"class":748},[734,1119,802],{"class":744},[734,1121,1122],{"class":805}," signal",[734,1124,809],{"class":744},[734,1126,1086],{"class":748},[734,1128,849],{"class":744},[734,1130,1131],{"class":748},"signal ",[734,1133,1134],{"class":744},"}",[734,1136,837],{"class":748},[734,1138,840],{"class":744},[734,1140,1142,1144,1146,1148,1150,1152,1155,1157,1159,1161,1163,1165,1167,1169,1171,1173],{"class":736,"line":1141},7,[734,1143,846],{"class":748},[734,1145,849],{"class":744},[734,1147,852],{"class":796},[734,1149,799],{"class":805},[734,1151,817],{"class":744},[734,1153,1154],{"class":761},"live:",[734,1156,817],{"class":744},[734,1158,820],{"class":744},[734,1160,867],{"class":748},[734,1162,849],{"class":744},[734,1164,872],{"class":748},[734,1166,875],{"class":744},[734,1168,867],{"class":748},[734,1170,849],{"class":744},[734,1172,882],{"class":748},[734,1174,885],{"class":805},[734,1176,1178],{"class":736,"line":1177},8,[734,1179,891],{"class":744},[608,1181,1182,1185,1186,1189],{},[617,1183,1184],{},"tailFsLogs(options)"," first yields existing events (unless ",[617,1187,1188],{},"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.",[899,1191,1193],{"id":1192},"tail-specific-options","Tail-specific options",[903,1195,1196,1206],{},[906,1197,1198],{},[909,1199,1200,1202,1204],{},[912,1201,914],{},[912,1203,917],{},[912,1205,920],{},[922,1207,1208,1223,1238],{},[909,1209,1210,1215,1220],{},[927,1211,1212],{},[617,1213,1214],{},"pollIntervalMs",[927,1216,1217],{},[617,1218,1219],{},"number",[927,1221,1222],{},"Polling interval. Default: 500ms (minimum 50ms).",[909,1224,1225,1230,1235],{},[927,1226,1227],{},[617,1228,1229],{},"fromEnd",[927,1231,1232],{},[617,1233,1234],{},"boolean",[927,1236,1237],{},"Skip existing events; only yield future ones. Default: false.",[909,1239,1240,1245,1249],{},[927,1241,1242],{},[617,1243,1244],{},"signal",[927,1246,1247],{},[617,1248,689],{},[927,1250,1251],{},"Stop tailing when aborted.",[608,1253,1254,1255,1260],{},"All ",[612,1256,1258],{"href":1257},"#options",[617,1259,672],{}," options also apply.",[720,1262,1264],{"id":1263},"use-cases","Use cases",[654,1266,1267,1273,1276,1286],{},[657,1268,1269,1270,1272],{},"A local Electron \u002F Tauri dashboard reading ",[617,1271,623],{}," from a target project directory",[657,1274,1275],{},"A CI report aggregator that scans logs after a test run",[657,1277,1278,1279,1282,1283],{},"A ",[617,1280,1281],{},"grep","-style CLI that pipes filtered events into ",[617,1284,1285],{},"jq",[657,1287,1288,1289],{},"Replaying historic events into a dashboard before switching to a live in-process subscription. See the ",[612,1290,1292],{"href":1291},"\u002Fextend\u002Fconsumer-recipes#3-replay-history-then-go-live","replay-then-live recipe",[1294,1295,1296],"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":730,"searchDepth":767,"depth":767,"links":1298},[1299,1302,1305],{"id":722,"depth":767,"text":723,"children":1300},[1301],{"id":901,"depth":774,"text":346},{"id":1008,"depth":767,"text":1009,"children":1303},[1304],{"id":1192,"depth":774,"text":1193},{"id":1263,"depth":767,"text":1264},"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":503,"icon":506},{"title":503,"description":1306},"R4g1MMNweLy_HA56RMBi-WG1D7Jb4XHOLc2nDmDbp2A",[1314,1316],{"title":499,"path":500,"stem":501,"description":1315,"icon":492,"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":415,"path":508,"stem":509,"description":1317,"icon":510,"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.",1791103203279]