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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":604,"body":605,"description":1323,"extension":1324,"links":1325,"meta":1330,"navigation":1331,"path":375,"seo":1332,"stem":376,"__hash__":1333},"docs\u002F5.use-cases\u002F3.better-auth\u002F03.middleware.md","createAuthMiddleware",{"type":606,"value":607,"toc":1317},"minimark",[608,619,774,788,792,803,906,910,913,998,1001,1056,1078,1082,1088,1263,1275,1296,1300,1313],[609,610,611,614,615,618],"p",{},[612,613,604],"code",{}," wraps ",[612,616,617],{},"identifyUser"," with the things you need on every request: route filtering, session resolution timing, lifecycle hooks, and silent error handling. Call it once at startup, then use the returned function in your framework's middleware\u002Fhook system.",[620,621,627],"pre",{"className":622,"code":623,"filename":624,"language":625,"meta":626,"style":626},"language-typescript shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { createAuthMiddleware } from 'evlog\u002Fbetter-auth'\n\nconst identify = createAuthMiddleware(auth, {\n  exclude: ['\u002Fapi\u002Fauth\u002F**', '\u002Fapi\u002Fpublic\u002F**'],\n  include: ['\u002Fapi\u002F**'],\n  maskEmail: true,\n})\n","server\u002Fmiddleware\u002Fauth-identify.ts","typescript","",[612,628,629,662,669,694,730,751,765],{"__ignoreMap":626},[630,631,634,638,642,646,649,652,655,659],"span",{"class":632,"line":633},"line",1,[630,635,637],{"class":636},"s7zQu","import",[630,639,641],{"class":640},"sMK4o"," {",[630,643,645],{"class":644},"sTEyZ"," createAuthMiddleware",[630,647,648],{"class":640}," }",[630,650,651],{"class":636}," from",[630,653,654],{"class":640}," '",[630,656,658],{"class":657},"sfazB","evlog\u002Fbetter-auth",[630,660,661],{"class":640},"'\n",[630,663,665],{"class":632,"line":664},2,[630,666,668],{"emptyLinePlaceholder":667},true,"\n",[630,670,672,676,679,682,685,688,691],{"class":632,"line":671},3,[630,673,675],{"class":674},"spNyl","const",[630,677,678],{"class":644}," identify ",[630,680,681],{"class":640},"=",[630,683,645],{"class":684},"s2Zo4",[630,686,687],{"class":644},"(auth",[630,689,690],{"class":640},",",[630,692,693],{"class":640}," {\n",[630,695,697,701,704,707,710,713,715,717,719,722,724,727],{"class":632,"line":696},4,[630,698,700],{"class":699},"swJcz","  exclude",[630,702,703],{"class":640},":",[630,705,706],{"class":644}," [",[630,708,709],{"class":640},"'",[630,711,712],{"class":657},"\u002Fapi\u002Fauth\u002F**",[630,714,709],{"class":640},[630,716,690],{"class":640},[630,718,654],{"class":640},[630,720,721],{"class":657},"\u002Fapi\u002Fpublic\u002F**",[630,723,709],{"class":640},[630,725,726],{"class":644},"]",[630,728,729],{"class":640},",\n",[630,731,733,736,738,740,742,745,747,749],{"class":632,"line":732},5,[630,734,735],{"class":699},"  include",[630,737,703],{"class":640},[630,739,706],{"class":644},[630,741,709],{"class":640},[630,743,744],{"class":657},"\u002Fapi\u002F**",[630,746,709],{"class":640},[630,748,726],{"class":644},[630,750,729],{"class":640},[630,752,754,757,759,763],{"class":632,"line":753},6,[630,755,756],{"class":699},"  maskEmail",[630,758,703],{"class":640},[630,760,762],{"class":761},"sfNiH"," true",[630,764,729],{"class":640},[630,766,768,771],{"class":632,"line":767},7,[630,769,770],{"class":640},"}",[630,772,773],{"class":644},")\n",[609,775,776,777,780,781,783,784,787],{},"The function signature is ",[612,778,779],{},"(log, headers, path?) => Promise\u003Cboolean>",". It resolves the session, calls ",[612,782,617],{},", captures timing into ",[612,785,786],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[789,790,346],"h2",{"id":791},"options",[609,793,794,795,802],{},"Inherits all ",[796,797,799,801],"a",{"href":798},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[612,800,617],{}," options",", plus:",[804,805,806,825],"table",{},[807,808,809],"thead",{},[810,811,812,816,819,822],"tr",{},[813,814,815],"th",{},"Option",[813,817,818],{},"Type",[813,820,821],{},"Default",[813,823,824],{},"Description",[826,827,828,849,868,887],"tbody",{},[810,829,830,836,841,846],{},[831,832,833],"td",{},[612,834,835],{},"exclude",[831,837,838],{},[612,839,840],{},"string[]",[831,842,843],{},[612,844,845],{},"['\u002Fapi\u002Fauth\u002F**']",[831,847,848],{},"Route patterns to skip (glob).",[810,850,851,856,860,865],{},[831,852,853],{},[612,854,855],{},"include",[831,857,858],{},[612,859,840],{},[831,861,862],{},[612,863,864],{},"undefined",[831,866,867],{},"If set, only matching routes are resolved.",[810,869,870,875,880,884],{},[831,871,872],{},[612,873,874],{},"onIdentify",[831,876,877],{},[612,878,879],{},"(log, session) => void",[831,881,882],{},[612,883,864],{},[831,885,886],{},"Called after successful identification.",[810,888,889,894,899,903],{},[831,890,891],{},[612,892,893],{},"onAnonymous",[831,895,896],{},[612,897,898],{},"(log) => void",[831,900,901],{},[612,902,864],{},[831,904,905],{},"Called when no session is found.",[789,907,909],{"id":908},"skip-the-routes-that-do-not-need-a-session","Skip the routes that do not need a session",[609,911,912],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[620,914,916],{"className":622,"code":915,"language":625,"meta":626,"style":626},"const identify = createAuthMiddleware(auth, {\n  exclude: [\n    '\u002Fapi\u002Fauth\u002F**',     \u002F\u002F Better Auth itself\n    '\u002Fapi\u002Fpublic\u002F**',   \u002F\u002F Public endpoints\n    '\u002Fapi\u002Fhealth',      \u002F\u002F Health checks\n  ],\n})\n",[612,917,918,934,943,958,971,985,992],{"__ignoreMap":626},[630,919,920,922,924,926,928,930,932],{"class":632,"line":633},[630,921,675],{"class":674},[630,923,678],{"class":644},[630,925,681],{"class":640},[630,927,645],{"class":684},[630,929,687],{"class":644},[630,931,690],{"class":640},[630,933,693],{"class":640},[630,935,936,938,940],{"class":632,"line":664},[630,937,700],{"class":699},[630,939,703],{"class":640},[630,941,942],{"class":644}," [\n",[630,944,945,948,950,952,954],{"class":632,"line":671},[630,946,947],{"class":640},"    '",[630,949,712],{"class":657},[630,951,709],{"class":640},[630,953,690],{"class":640},[630,955,957],{"class":956},"sHwdD","     \u002F\u002F Better Auth itself\n",[630,959,960,962,964,966,968],{"class":632,"line":696},[630,961,947],{"class":640},[630,963,721],{"class":657},[630,965,709],{"class":640},[630,967,690],{"class":640},[630,969,970],{"class":956},"   \u002F\u002F Public endpoints\n",[630,972,973,975,978,980,982],{"class":632,"line":732},[630,974,947],{"class":640},[630,976,977],{"class":657},"\u002Fapi\u002Fhealth",[630,979,709],{"class":640},[630,981,690],{"class":640},[630,983,984],{"class":956},"      \u002F\u002F Health checks\n",[630,986,987,990],{"class":632,"line":753},[630,988,989],{"class":644},"  ]",[630,991,729],{"class":640},[630,993,994,996],{"class":632,"line":767},[630,995,770],{"class":640},[630,997,773],{"class":644},[609,999,1000],{},"For high-traffic apps, flip the model and only resolve sessions on routes that need them:",[620,1002,1004],{"className":622,"code":1003,"language":625,"meta":626,"style":626},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[612,1005,1006,1022,1050],{"__ignoreMap":626},[630,1007,1008,1010,1012,1014,1016,1018,1020],{"class":632,"line":633},[630,1009,675],{"class":674},[630,1011,678],{"class":644},[630,1013,681],{"class":640},[630,1015,645],{"class":684},[630,1017,687],{"class":644},[630,1019,690],{"class":640},[630,1021,693],{"class":640},[630,1023,1024,1026,1028,1030,1032,1035,1037,1039,1041,1044,1046,1048],{"class":632,"line":664},[630,1025,735],{"class":699},[630,1027,703],{"class":640},[630,1029,706],{"class":644},[630,1031,709],{"class":640},[630,1033,1034],{"class":657},"\u002Fapi\u002Fdashboard\u002F**",[630,1036,709],{"class":640},[630,1038,690],{"class":640},[630,1040,654],{"class":640},[630,1042,1043],{"class":657},"\u002Fapi\u002Faccount\u002F**",[630,1045,709],{"class":640},[630,1047,726],{"class":644},[630,1049,729],{"class":640},[630,1051,1052,1054],{"class":632,"line":671},[630,1053,770],{"class":640},[630,1055,773],{"class":644},[609,1057,1058,1060,1061,1063,1064,1067,1068,1071,1072,1074,1075,1077],{},[612,1059,855],{}," and ",[612,1062,835],{}," use glob patterns (",[612,1065,1066],{},"*",", ",[612,1069,1070],{},"**","). Provide both if you need granular control, and ",[612,1073,835],{}," wins over ",[612,1076,855],{},".",[789,1079,1081],{"id":1080},"react-to-identification","React to identification",[609,1083,1084,1085,1087],{},"Use ",[612,1086,874],{}," to react to user identification, for example to force-keep logs for premium users via tail sampling:",[620,1089,1091],{"className":622,"code":1090,"filename":624,"language":625,"meta":626,"style":626},"const identify = createAuthMiddleware(auth, {\n  onIdentify: (log, session) => {\n    if (session.user.plan === 'enterprise') {\n      log.set({ _forceKeep: true })\n    }\n  },\n  onAnonymous: (log) => {\n    log.set({ anonymous: true })\n  },\n})\n",[612,1092,1093,1109,1136,1172,1199,1204,1209,1226,1251,1256],{"__ignoreMap":626},[630,1094,1095,1097,1099,1101,1103,1105,1107],{"class":632,"line":633},[630,1096,675],{"class":674},[630,1098,678],{"class":644},[630,1100,681],{"class":640},[630,1102,645],{"class":684},[630,1104,687],{"class":644},[630,1106,690],{"class":640},[630,1108,693],{"class":640},[630,1110,1111,1114,1116,1119,1123,1125,1128,1131,1134],{"class":632,"line":664},[630,1112,1113],{"class":684},"  onIdentify",[630,1115,703],{"class":640},[630,1117,1118],{"class":640}," (",[630,1120,1122],{"class":1121},"sHdIc","log",[630,1124,690],{"class":640},[630,1126,1127],{"class":1121}," session",[630,1129,1130],{"class":640},")",[630,1132,1133],{"class":674}," =>",[630,1135,693],{"class":640},[630,1137,1138,1141,1143,1146,1148,1151,1153,1156,1159,1161,1164,1166,1169],{"class":632,"line":671},[630,1139,1140],{"class":636},"    if",[630,1142,1118],{"class":699},[630,1144,1145],{"class":644},"session",[630,1147,1077],{"class":640},[630,1149,1150],{"class":644},"user",[630,1152,1077],{"class":640},[630,1154,1155],{"class":644},"plan",[630,1157,1158],{"class":640}," ===",[630,1160,654],{"class":640},[630,1162,1163],{"class":657},"enterprise",[630,1165,709],{"class":640},[630,1167,1168],{"class":699},") ",[630,1170,1171],{"class":640},"{\n",[630,1173,1174,1177,1179,1182,1185,1188,1191,1193,1195,1197],{"class":632,"line":696},[630,1175,1176],{"class":644},"      log",[630,1178,1077],{"class":640},[630,1180,1181],{"class":684},"set",[630,1183,1184],{"class":699},"(",[630,1186,1187],{"class":640},"{",[630,1189,1190],{"class":699}," _forceKeep",[630,1192,703],{"class":640},[630,1194,762],{"class":761},[630,1196,648],{"class":640},[630,1198,773],{"class":699},[630,1200,1201],{"class":632,"line":732},[630,1202,1203],{"class":640},"    }\n",[630,1205,1206],{"class":632,"line":753},[630,1207,1208],{"class":640},"  },\n",[630,1210,1211,1214,1216,1218,1220,1222,1224],{"class":632,"line":767},[630,1212,1213],{"class":684},"  onAnonymous",[630,1215,703],{"class":640},[630,1217,1118],{"class":640},[630,1219,1122],{"class":1121},[630,1221,1130],{"class":640},[630,1223,1133],{"class":674},[630,1225,693],{"class":640},[630,1227,1229,1232,1234,1236,1238,1240,1243,1245,1247,1249],{"class":632,"line":1228},8,[630,1230,1231],{"class":644},"    log",[630,1233,1077],{"class":640},[630,1235,1181],{"class":684},[630,1237,1184],{"class":699},[630,1239,1187],{"class":640},[630,1241,1242],{"class":699}," anonymous",[630,1244,703],{"class":640},[630,1246,762],{"class":761},[630,1248,648],{"class":640},[630,1250,773],{"class":699},[630,1252,1254],{"class":632,"line":1253},9,[630,1255,1208],{"class":640},[630,1257,1259,1261],{"class":632,"line":1258},10,[630,1260,770],{"class":640},[630,1262,773],{"class":644},[609,1264,1265,1266,1268,1269,1271,1272,1274],{},"Hooks fire after the session is resolved and ",[612,1267,617],{}," has set its fields. They run on every request that passes the ",[612,1270,855],{},"\u002F",[612,1273,835],{}," filter, so keep them fast and side-effect-free.",[1276,1277,1278,1283],"tip",{},[609,1279,1280,1281,703],{},"Common patterns for ",[612,1282,874],{},[1284,1285,1286,1290,1293],"ul",{},[1287,1288,1289],"li",{},"Force-keep audit logs for admins or high-value plans.",[1287,1291,1292],{},"Tag the request with feature flags or tenant info loaded from the session.",[1287,1294,1295],{},"Increment a per-user counter for billing.",[789,1297,1299],{"id":1298},"what-happens-when-auth-fails","What happens when auth fails",[609,1301,1302,1303,1306,1307,1060,1309,1312],{},"The middleware catches every error from ",[612,1304,1305],{},"getSession"," and logs nothing, so your request keeps flowing whether the auth backend is up or down. The wide event still includes ",[612,1308,786],{},[612,1310,1311],{},"auth.identified: false"," so you can alert on session resolution health from your dashboards.",[1314,1315,1316],"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 pre.shiki code .sfNiH, html code.shiki .sfNiH{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}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);}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sHdIc, html code.shiki .sHdIc{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}",{"title":626,"searchDepth":664,"depth":664,"links":1318},[1319,1320,1321,1322],{"id":791,"depth":664,"text":346},{"id":908,"depth":664,"text":909},{"id":1080,"depth":664,"text":1081},{"id":1298,"depth":664,"text":1299},"Framework-agnostic factory with route filtering, session timing, and lifecycle hooks. Call it once at startup and reuse across requests.","md",[1326,1329],{"label":369,"icon":372,"to":370,"color":1327,"variant":1328},"neutral","subtle",{"label":383,"icon":112,"to":384,"color":1327,"variant":1328},{},{"title":374,"icon":377},{"title":604,"description":1323},"W5iPJDKIMXykmBxrqRGnyCbSUGNKZLZjNw0Sw3TEzU0",[1335,1337],{"title":369,"path":370,"stem":371,"description":1336,"icon":372,"children":-1},"The core building block — extract safe user fields, mask emails, and capture plugin data (organizations, roles, 2FA) from a Better Auth session.",{"title":379,"path":380,"stem":381,"description":1338,"icon":330,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1791059993099]