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Call it once at startup, then use the returned function in your framework's middleware\u002Fhook system.",[533,534,540],"pre",{"className":535,"code":536,"filename":537,"language":538,"meta":539,"style":539},"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","",[525,541,542,575,582,607,643,664,678],{"__ignoreMap":539},[543,544,547,551,555,559,562,565,568,572],"span",{"class":545,"line":546},"line",1,[543,548,550],{"class":549},"s7zQu","import",[543,552,554],{"class":553},"sMK4o"," {",[543,556,558],{"class":557},"sTEyZ"," createAuthMiddleware",[543,560,561],{"class":553}," }",[543,563,564],{"class":549}," from",[543,566,567],{"class":553}," '",[543,569,571],{"class":570},"sfazB","evlog\u002Fbetter-auth",[543,573,574],{"class":553},"'\n",[543,576,578],{"class":545,"line":577},2,[543,579,581],{"emptyLinePlaceholder":580},true,"\n",[543,583,585,589,592,595,598,601,604],{"class":545,"line":584},3,[543,586,588],{"class":587},"spNyl","const",[543,590,591],{"class":557}," identify ",[543,593,594],{"class":553},"=",[543,596,558],{"class":597},"s2Zo4",[543,599,600],{"class":557},"(auth",[543,602,603],{"class":553},",",[543,605,606],{"class":553}," {\n",[543,608,610,614,617,620,623,626,628,630,632,635,637,640],{"class":545,"line":609},4,[543,611,613],{"class":612},"swJcz","  exclude",[543,615,616],{"class":553},":",[543,618,619],{"class":557}," [",[543,621,622],{"class":553},"'",[543,624,625],{"class":570},"\u002Fapi\u002Fauth\u002F**",[543,627,622],{"class":553},[543,629,603],{"class":553},[543,631,567],{"class":553},[543,633,634],{"class":570},"\u002Fapi\u002Fpublic\u002F**",[543,636,622],{"class":553},[543,638,639],{"class":557},"]",[543,641,642],{"class":553},",\n",[543,644,646,649,651,653,655,658,660,662],{"class":545,"line":645},5,[543,647,648],{"class":612},"  include",[543,650,616],{"class":553},[543,652,619],{"class":557},[543,654,622],{"class":553},[543,656,657],{"class":570},"\u002Fapi\u002F**",[543,659,622],{"class":553},[543,661,639],{"class":557},[543,663,642],{"class":553},[543,665,667,670,672,676],{"class":545,"line":666},6,[543,668,669],{"class":612},"  maskEmail",[543,671,616],{"class":553},[543,673,675],{"class":674},"sfNiH"," true",[543,677,642],{"class":553},[543,679,681,684],{"class":545,"line":680},7,[543,682,683],{"class":553},"}",[543,685,686],{"class":557},")\n",[522,688,689,690,693,694,696,697,700],{},"The function signature is ",[525,691,692],{},"(log, headers, path?) => Promise\u003Cboolean>",". It resolves the session, calls ",[525,695,530],{},", captures timing into ",[525,698,699],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[702,703,326],"h2",{"id":704},"options",[522,706,707,708,715],{},"Inherits all ",[709,710,712,714],"a",{"href":711},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[525,713,530],{}," options",", plus:",[717,718,719,738],"table",{},[720,721,722],"thead",{},[723,724,725,729,732,735],"tr",{},[726,727,728],"th",{},"Option",[726,730,731],{},"Type",[726,733,734],{},"Default",[726,736,737],{},"Description",[739,740,741,762,781,800],"tbody",{},[723,742,743,749,754,759],{},[744,745,746],"td",{},[525,747,748],{},"exclude",[744,750,751],{},[525,752,753],{},"string[]",[744,755,756],{},[525,757,758],{},"['\u002Fapi\u002Fauth\u002F**']",[744,760,761],{},"Route patterns to skip (glob).",[723,763,764,769,773,778],{},[744,765,766],{},[525,767,768],{},"include",[744,770,771],{},[525,772,753],{},[744,774,775],{},[525,776,777],{},"undefined",[744,779,780],{},"If set, only matching routes are resolved.",[723,782,783,788,793,797],{},[744,784,785],{},[525,786,787],{},"onIdentify",[744,789,790],{},[525,791,792],{},"(log, session) => void",[744,794,795],{},[525,796,777],{},[744,798,799],{},"Called after successful identification.",[723,801,802,807,812,816],{},[744,803,804],{},[525,805,806],{},"onAnonymous",[744,808,809],{},[525,810,811],{},"(log) => void",[744,813,814],{},[525,815,777],{},[744,817,818],{},"Called when no session is found.",[702,820,822],{"id":821},"route-filtering","Route Filtering",[522,824,825],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[533,827,829],{"className":535,"code":828,"language":538,"meta":539,"style":539},"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",[525,830,831,847,856,871,884,898,905],{"__ignoreMap":539},[543,832,833,835,837,839,841,843,845],{"class":545,"line":546},[543,834,588],{"class":587},[543,836,591],{"class":557},[543,838,594],{"class":553},[543,840,558],{"class":597},[543,842,600],{"class":557},[543,844,603],{"class":553},[543,846,606],{"class":553},[543,848,849,851,853],{"class":545,"line":577},[543,850,613],{"class":612},[543,852,616],{"class":553},[543,854,855],{"class":557}," [\n",[543,857,858,861,863,865,867],{"class":545,"line":584},[543,859,860],{"class":553},"    '",[543,862,625],{"class":570},[543,864,622],{"class":553},[543,866,603],{"class":553},[543,868,870],{"class":869},"sHwdD","     \u002F\u002F Better Auth itself\n",[543,872,873,875,877,879,881],{"class":545,"line":609},[543,874,860],{"class":553},[543,876,634],{"class":570},[543,878,622],{"class":553},[543,880,603],{"class":553},[543,882,883],{"class":869},"   \u002F\u002F Public endpoints\n",[543,885,886,888,891,893,895],{"class":545,"line":645},[543,887,860],{"class":553},[543,889,890],{"class":570},"\u002Fapi\u002Fhealth",[543,892,622],{"class":553},[543,894,603],{"class":553},[543,896,897],{"class":869},"      \u002F\u002F Health checks\n",[543,899,900,903],{"class":545,"line":666},[543,901,902],{"class":557},"  ]",[543,904,642],{"class":553},[543,906,907,909],{"class":545,"line":680},[543,908,683],{"class":553},[543,910,686],{"class":557},[522,912,913],{},"For high-traffic apps, flip the model — only resolve sessions on routes that need them:",[533,915,917],{"className":535,"code":916,"language":538,"meta":539,"style":539},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[525,918,919,935,963],{"__ignoreMap":539},[543,920,921,923,925,927,929,931,933],{"class":545,"line":546},[543,922,588],{"class":587},[543,924,591],{"class":557},[543,926,594],{"class":553},[543,928,558],{"class":597},[543,930,600],{"class":557},[543,932,603],{"class":553},[543,934,606],{"class":553},[543,936,937,939,941,943,945,948,950,952,954,957,959,961],{"class":545,"line":577},[543,938,648],{"class":612},[543,940,616],{"class":553},[543,942,619],{"class":557},[543,944,622],{"class":553},[543,946,947],{"class":570},"\u002Fapi\u002Fdashboard\u002F**",[543,949,622],{"class":553},[543,951,603],{"class":553},[543,953,567],{"class":553},[543,955,956],{"class":570},"\u002Fapi\u002Faccount\u002F**",[543,958,622],{"class":553},[543,960,639],{"class":557},[543,962,642],{"class":553},[543,964,965,967],{"class":545,"line":584},[543,966,683],{"class":553},[543,968,686],{"class":557},[522,970,971,973,974,976,977,980,981,984,985,987,988,990],{},[525,972,768],{}," and ",[525,975,748],{}," use glob patterns (",[525,978,979],{},"*",", ",[525,982,983],{},"**","). Provide both if you need granular control — ",[525,986,748],{}," wins over ",[525,989,768],{},".",[702,992,994],{"id":993},"lifecycle-hooks","Lifecycle Hooks",[522,996,997,998,1000],{},"Use ",[525,999,787],{}," to react to user identification — for example, force-keep logs for premium users via tail sampling:",[533,1002,1004],{"className":535,"code":1003,"filename":537,"language":538,"meta":539,"style":539},"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",[525,1005,1006,1022,1049,1085,1112,1117,1122,1139,1164,1169],{"__ignoreMap":539},[543,1007,1008,1010,1012,1014,1016,1018,1020],{"class":545,"line":546},[543,1009,588],{"class":587},[543,1011,591],{"class":557},[543,1013,594],{"class":553},[543,1015,558],{"class":597},[543,1017,600],{"class":557},[543,1019,603],{"class":553},[543,1021,606],{"class":553},[543,1023,1024,1027,1029,1032,1036,1038,1041,1044,1047],{"class":545,"line":577},[543,1025,1026],{"class":597},"  onIdentify",[543,1028,616],{"class":553},[543,1030,1031],{"class":553}," (",[543,1033,1035],{"class":1034},"sHdIc","log",[543,1037,603],{"class":553},[543,1039,1040],{"class":1034}," session",[543,1042,1043],{"class":553},")",[543,1045,1046],{"class":587}," =>",[543,1048,606],{"class":553},[543,1050,1051,1054,1056,1059,1061,1064,1066,1069,1072,1074,1077,1079,1082],{"class":545,"line":584},[543,1052,1053],{"class":549},"    if",[543,1055,1031],{"class":612},[543,1057,1058],{"class":557},"session",[543,1060,990],{"class":553},[543,1062,1063],{"class":557},"user",[543,1065,990],{"class":553},[543,1067,1068],{"class":557},"plan",[543,1070,1071],{"class":553}," ===",[543,1073,567],{"class":553},[543,1075,1076],{"class":570},"enterprise",[543,1078,622],{"class":553},[543,1080,1081],{"class":612},") ",[543,1083,1084],{"class":553},"{\n",[543,1086,1087,1090,1092,1095,1098,1101,1104,1106,1108,1110],{"class":545,"line":609},[543,1088,1089],{"class":557},"      log",[543,1091,990],{"class":553},[543,1093,1094],{"class":597},"set",[543,1096,1097],{"class":612},"(",[543,1099,1100],{"class":553},"{",[543,1102,1103],{"class":612}," _forceKeep",[543,1105,616],{"class":553},[543,1107,675],{"class":674},[543,1109,561],{"class":553},[543,1111,686],{"class":612},[543,1113,1114],{"class":545,"line":645},[543,1115,1116],{"class":553},"    }\n",[543,1118,1119],{"class":545,"line":666},[543,1120,1121],{"class":553},"  },\n",[543,1123,1124,1127,1129,1131,1133,1135,1137],{"class":545,"line":680},[543,1125,1126],{"class":597},"  onAnonymous",[543,1128,616],{"class":553},[543,1130,1031],{"class":553},[543,1132,1035],{"class":1034},[543,1134,1043],{"class":553},[543,1136,1046],{"class":587},[543,1138,606],{"class":553},[543,1140,1142,1145,1147,1149,1151,1153,1156,1158,1160,1162],{"class":545,"line":1141},8,[543,1143,1144],{"class":557},"    log",[543,1146,990],{"class":553},[543,1148,1094],{"class":597},[543,1150,1097],{"class":612},[543,1152,1100],{"class":553},[543,1154,1155],{"class":612}," anonymous",[543,1157,616],{"class":553},[543,1159,675],{"class":674},[543,1161,561],{"class":553},[543,1163,686],{"class":612},[543,1165,1167],{"class":545,"line":1166},9,[543,1168,1121],{"class":553},[543,1170,1172,1174],{"class":545,"line":1171},10,[543,1173,683],{"class":553},[543,1175,686],{"class":557},[522,1177,1178,1179,1181,1182,1184,1185,1187],{},"Hooks fire after the session is resolved and ",[525,1180,530],{}," has set its fields. They run on every request that passes the ",[525,1183,768],{},"\u002F",[525,1186,748],{}," filter, so keep them fast and side-effect-free.",[1189,1190,1191,1196],"tip",{},[522,1192,1193,1194,616],{},"Common patterns for ",[525,1195,787],{},[1197,1198,1199,1203,1206],"ul",{},[1200,1201,1202],"li",{},"Force-keep audit logs for admins or high-value plans.",[1200,1204,1205],{},"Tag the request with feature flags or tenant info loaded from the session.",[1200,1207,1208],{},"Increment a per-user counter for billing.",[702,1210,1212],{"id":1211},"error-handling","Error Handling",[522,1214,1215,1216,1219,1220,973,1222,1225],{},"The middleware catches every error from ",[525,1217,1218],{},"getSession"," and logs nothing — your request keeps flowing whether the auth backend is up or down. The wide event still includes ",[525,1221,699],{},[525,1223,1224],{},"auth.identified: false"," so you can alert on session resolution health from your dashboards.",[1227,1228,1229],"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":539,"searchDepth":577,"depth":577,"links":1231},[1232,1233,1234,1235],{"id":704,"depth":577,"text":326},{"id":821,"depth":577,"text":822},{"id":993,"depth":577,"text":994},{"id":1211,"depth":577,"text":1212},"Framework-agnostic factory with route filtering, session timing, and lifecycle hooks. Call it once at startup and reuse across requests.","md",[1239,1242],{"label":350,"icon":353,"to":351,"color":1240,"variant":1241},"neutral","subtle",{"label":364,"icon":107,"to":365,"color":1240,"variant":1241},{},{"title":355,"icon":358},{"title":517,"description":1236},"jrR5gM4N47j96nisEwXGF_GTGeo8G3av0oISM0JNjLA",[1248,1250],{"title":350,"path":351,"stem":352,"description":1249,"icon":353,"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":360,"path":361,"stem":362,"description":1251,"icon":310,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1785610606274]