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Call it once at startup, then use the returned function in your framework's middleware\u002Fhook system.",[552,553,559],"pre",{"className":554,"code":555,"filename":556,"language":557,"meta":558,"style":558},"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","",[544,560,561,594,601,626,662,683,697],{"__ignoreMap":558},[562,563,566,570,574,578,581,584,587,591],"span",{"class":564,"line":565},"line",1,[562,567,569],{"class":568},"s7zQu","import",[562,571,573],{"class":572},"sMK4o"," {",[562,575,577],{"class":576},"sTEyZ"," createAuthMiddleware",[562,579,580],{"class":572}," }",[562,582,583],{"class":568}," from",[562,585,586],{"class":572}," '",[562,588,590],{"class":589},"sfazB","evlog\u002Fbetter-auth",[562,592,593],{"class":572},"'\n",[562,595,597],{"class":564,"line":596},2,[562,598,600],{"emptyLinePlaceholder":599},true,"\n",[562,602,604,608,611,614,617,620,623],{"class":564,"line":603},3,[562,605,607],{"class":606},"spNyl","const",[562,609,610],{"class":576}," identify ",[562,612,613],{"class":572},"=",[562,615,577],{"class":616},"s2Zo4",[562,618,619],{"class":576},"(auth",[562,621,622],{"class":572},",",[562,624,625],{"class":572}," {\n",[562,627,629,633,636,639,642,645,647,649,651,654,656,659],{"class":564,"line":628},4,[562,630,632],{"class":631},"swJcz","  exclude",[562,634,635],{"class":572},":",[562,637,638],{"class":576}," [",[562,640,641],{"class":572},"'",[562,643,644],{"class":589},"\u002Fapi\u002Fauth\u002F**",[562,646,641],{"class":572},[562,648,622],{"class":572},[562,650,586],{"class":572},[562,652,653],{"class":589},"\u002Fapi\u002Fpublic\u002F**",[562,655,641],{"class":572},[562,657,658],{"class":576},"]",[562,660,661],{"class":572},",\n",[562,663,665,668,670,672,674,677,679,681],{"class":564,"line":664},5,[562,666,667],{"class":631},"  include",[562,669,635],{"class":572},[562,671,638],{"class":576},[562,673,641],{"class":572},[562,675,676],{"class":589},"\u002Fapi\u002F**",[562,678,641],{"class":572},[562,680,658],{"class":576},[562,682,661],{"class":572},[562,684,686,689,691,695],{"class":564,"line":685},6,[562,687,688],{"class":631},"  maskEmail",[562,690,635],{"class":572},[562,692,694],{"class":693},"sfNiH"," true",[562,696,661],{"class":572},[562,698,700,703],{"class":564,"line":699},7,[562,701,702],{"class":572},"}",[562,704,705],{"class":576},")\n",[541,707,708,709,712,713,715,716,719],{},"The function signature is ",[544,710,711],{},"(log, headers, path?) => Promise\u003Cboolean>",". It resolves the session, calls ",[544,714,549],{},", captures timing into ",[544,717,718],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[721,722,336],"h2",{"id":723},"options",[541,725,726,727,734],{},"Inherits all ",[728,729,731,733],"a",{"href":730},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[544,732,549],{}," options",", plus:",[736,737,738,757],"table",{},[739,740,741],"thead",{},[742,743,744,748,751,754],"tr",{},[745,746,747],"th",{},"Option",[745,749,750],{},"Type",[745,752,753],{},"Default",[745,755,756],{},"Description",[758,759,760,781,800,819],"tbody",{},[742,761,762,768,773,778],{},[763,764,765],"td",{},[544,766,767],{},"exclude",[763,769,770],{},[544,771,772],{},"string[]",[763,774,775],{},[544,776,777],{},"['\u002Fapi\u002Fauth\u002F**']",[763,779,780],{},"Route patterns to skip (glob).",[742,782,783,788,792,797],{},[763,784,785],{},[544,786,787],{},"include",[763,789,790],{},[544,791,772],{},[763,793,794],{},[544,795,796],{},"undefined",[763,798,799],{},"If set, only matching routes are resolved.",[742,801,802,807,812,816],{},[763,803,804],{},[544,805,806],{},"onIdentify",[763,808,809],{},[544,810,811],{},"(log, session) => void",[763,813,814],{},[544,815,796],{},[763,817,818],{},"Called after successful identification.",[742,820,821,826,831,835],{},[763,822,823],{},[544,824,825],{},"onAnonymous",[763,827,828],{},[544,829,830],{},"(log) => void",[763,832,833],{},[544,834,796],{},[763,836,837],{},"Called when no session is found.",[721,839,841],{"id":840},"route-filtering","Route Filtering",[541,843,844],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[552,846,848],{"className":554,"code":847,"language":557,"meta":558,"style":558},"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",[544,849,850,866,875,890,903,917,924],{"__ignoreMap":558},[562,851,852,854,856,858,860,862,864],{"class":564,"line":565},[562,853,607],{"class":606},[562,855,610],{"class":576},[562,857,613],{"class":572},[562,859,577],{"class":616},[562,861,619],{"class":576},[562,863,622],{"class":572},[562,865,625],{"class":572},[562,867,868,870,872],{"class":564,"line":596},[562,869,632],{"class":631},[562,871,635],{"class":572},[562,873,874],{"class":576}," [\n",[562,876,877,880,882,884,886],{"class":564,"line":603},[562,878,879],{"class":572},"    '",[562,881,644],{"class":589},[562,883,641],{"class":572},[562,885,622],{"class":572},[562,887,889],{"class":888},"sHwdD","     \u002F\u002F Better Auth itself\n",[562,891,892,894,896,898,900],{"class":564,"line":628},[562,893,879],{"class":572},[562,895,653],{"class":589},[562,897,641],{"class":572},[562,899,622],{"class":572},[562,901,902],{"class":888},"   \u002F\u002F Public endpoints\n",[562,904,905,907,910,912,914],{"class":564,"line":664},[562,906,879],{"class":572},[562,908,909],{"class":589},"\u002Fapi\u002Fhealth",[562,911,641],{"class":572},[562,913,622],{"class":572},[562,915,916],{"class":888},"      \u002F\u002F Health checks\n",[562,918,919,922],{"class":564,"line":685},[562,920,921],{"class":576},"  ]",[562,923,661],{"class":572},[562,925,926,928],{"class":564,"line":699},[562,927,702],{"class":572},[562,929,705],{"class":576},[541,931,932],{},"For high-traffic apps, flip the model — only resolve sessions on routes that need them:",[552,934,936],{"className":554,"code":935,"language":557,"meta":558,"style":558},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[544,937,938,954,982],{"__ignoreMap":558},[562,939,940,942,944,946,948,950,952],{"class":564,"line":565},[562,941,607],{"class":606},[562,943,610],{"class":576},[562,945,613],{"class":572},[562,947,577],{"class":616},[562,949,619],{"class":576},[562,951,622],{"class":572},[562,953,625],{"class":572},[562,955,956,958,960,962,964,967,969,971,973,976,978,980],{"class":564,"line":596},[562,957,667],{"class":631},[562,959,635],{"class":572},[562,961,638],{"class":576},[562,963,641],{"class":572},[562,965,966],{"class":589},"\u002Fapi\u002Fdashboard\u002F**",[562,968,641],{"class":572},[562,970,622],{"class":572},[562,972,586],{"class":572},[562,974,975],{"class":589},"\u002Fapi\u002Faccount\u002F**",[562,977,641],{"class":572},[562,979,658],{"class":576},[562,981,661],{"class":572},[562,983,984,986],{"class":564,"line":603},[562,985,702],{"class":572},[562,987,705],{"class":576},[541,989,990,992,993,995,996,999,1000,1003,1004,1006,1007,1009],{},[544,991,787],{}," and ",[544,994,767],{}," use glob patterns (",[544,997,998],{},"*",", ",[544,1001,1002],{},"**","). Provide both if you need granular control — ",[544,1005,767],{}," wins over ",[544,1008,787],{},".",[721,1011,1013],{"id":1012},"lifecycle-hooks","Lifecycle Hooks",[541,1015,1016,1017,1019],{},"Use ",[544,1018,806],{}," to react to user identification — for example, force-keep logs for premium users via tail sampling:",[552,1021,1023],{"className":554,"code":1022,"filename":556,"language":557,"meta":558,"style":558},"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",[544,1024,1025,1041,1068,1104,1131,1136,1141,1158,1183,1188],{"__ignoreMap":558},[562,1026,1027,1029,1031,1033,1035,1037,1039],{"class":564,"line":565},[562,1028,607],{"class":606},[562,1030,610],{"class":576},[562,1032,613],{"class":572},[562,1034,577],{"class":616},[562,1036,619],{"class":576},[562,1038,622],{"class":572},[562,1040,625],{"class":572},[562,1042,1043,1046,1048,1051,1055,1057,1060,1063,1066],{"class":564,"line":596},[562,1044,1045],{"class":616},"  onIdentify",[562,1047,635],{"class":572},[562,1049,1050],{"class":572}," (",[562,1052,1054],{"class":1053},"sHdIc","log",[562,1056,622],{"class":572},[562,1058,1059],{"class":1053}," session",[562,1061,1062],{"class":572},")",[562,1064,1065],{"class":606}," =>",[562,1067,625],{"class":572},[562,1069,1070,1073,1075,1078,1080,1083,1085,1088,1091,1093,1096,1098,1101],{"class":564,"line":603},[562,1071,1072],{"class":568},"    if",[562,1074,1050],{"class":631},[562,1076,1077],{"class":576},"session",[562,1079,1009],{"class":572},[562,1081,1082],{"class":576},"user",[562,1084,1009],{"class":572},[562,1086,1087],{"class":576},"plan",[562,1089,1090],{"class":572}," ===",[562,1092,586],{"class":572},[562,1094,1095],{"class":589},"enterprise",[562,1097,641],{"class":572},[562,1099,1100],{"class":631},") ",[562,1102,1103],{"class":572},"{\n",[562,1105,1106,1109,1111,1114,1117,1120,1123,1125,1127,1129],{"class":564,"line":628},[562,1107,1108],{"class":576},"      log",[562,1110,1009],{"class":572},[562,1112,1113],{"class":616},"set",[562,1115,1116],{"class":631},"(",[562,1118,1119],{"class":572},"{",[562,1121,1122],{"class":631}," _forceKeep",[562,1124,635],{"class":572},[562,1126,694],{"class":693},[562,1128,580],{"class":572},[562,1130,705],{"class":631},[562,1132,1133],{"class":564,"line":664},[562,1134,1135],{"class":572},"    }\n",[562,1137,1138],{"class":564,"line":685},[562,1139,1140],{"class":572},"  },\n",[562,1142,1143,1146,1148,1150,1152,1154,1156],{"class":564,"line":699},[562,1144,1145],{"class":616},"  onAnonymous",[562,1147,635],{"class":572},[562,1149,1050],{"class":572},[562,1151,1054],{"class":1053},[562,1153,1062],{"class":572},[562,1155,1065],{"class":606},[562,1157,625],{"class":572},[562,1159,1161,1164,1166,1168,1170,1172,1175,1177,1179,1181],{"class":564,"line":1160},8,[562,1162,1163],{"class":576},"    log",[562,1165,1009],{"class":572},[562,1167,1113],{"class":616},[562,1169,1116],{"class":631},[562,1171,1119],{"class":572},[562,1173,1174],{"class":631}," anonymous",[562,1176,635],{"class":572},[562,1178,694],{"class":693},[562,1180,580],{"class":572},[562,1182,705],{"class":631},[562,1184,1186],{"class":564,"line":1185},9,[562,1187,1140],{"class":572},[562,1189,1191,1193],{"class":564,"line":1190},10,[562,1192,702],{"class":572},[562,1194,705],{"class":576},[541,1196,1197,1198,1200,1201,1203,1204,1206],{},"Hooks fire after the session is resolved and ",[544,1199,549],{}," has set its fields. They run on every request that passes the ",[544,1202,787],{},"\u002F",[544,1205,767],{}," filter, so keep them fast and side-effect-free.",[1208,1209,1210,1215],"tip",{},[541,1211,1212,1213,635],{},"Common patterns for ",[544,1214,806],{},[1216,1217,1218,1222,1225],"ul",{},[1219,1220,1221],"li",{},"Force-keep audit logs for admins or high-value plans.",[1219,1223,1224],{},"Tag the request with feature flags or tenant info loaded from the session.",[1219,1226,1227],{},"Increment a per-user counter for billing.",[721,1229,1231],{"id":1230},"error-handling","Error Handling",[541,1233,1234,1235,1238,1239,992,1241,1244],{},"The middleware catches every error from ",[544,1236,1237],{},"getSession"," and logs nothing — your request keeps flowing whether the auth backend is up or down. The wide event still includes ",[544,1240,718],{},[544,1242,1243],{},"auth.identified: false"," so you can alert on session resolution health from your dashboards.",[1246,1247,1248],"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":558,"searchDepth":596,"depth":596,"links":1250},[1251,1252,1253,1254],{"id":723,"depth":596,"text":336},{"id":840,"depth":596,"text":841},{"id":1012,"depth":596,"text":1013},{"id":1230,"depth":596,"text":1231},"Framework-agnostic factory with route filtering, session timing, and lifecycle hooks. Call it once at startup and reuse across requests.","md",[1258,1261],{"label":360,"icon":363,"to":361,"color":1259,"variant":1260},"neutral","subtle",{"label":374,"icon":107,"to":375,"color":1259,"variant":1260},{},{"title":365,"icon":368},{"title":536,"description":1255},"jrR5gM4N47j96nisEwXGF_GTGeo8G3av0oISM0JNjLA",[1267,1269],{"title":360,"path":361,"stem":362,"description":1268,"icon":363,"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":370,"path":371,"stem":372,"description":1270,"icon":320,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1786743656746]