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Call it once at startup, then use the returned function in your framework's middleware\u002Fhook system.",[543,544,550],"pre",{"className":545,"code":546,"filename":547,"language":548,"meta":549,"style":549},"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","",[535,551,552,585,592,617,653,674,688],{"__ignoreMap":549},[553,554,557,561,565,569,572,575,578,582],"span",{"class":555,"line":556},"line",1,[553,558,560],{"class":559},"s7zQu","import",[553,562,564],{"class":563},"sMK4o"," {",[553,566,568],{"class":567},"sTEyZ"," createAuthMiddleware",[553,570,571],{"class":563}," }",[553,573,574],{"class":559}," from",[553,576,577],{"class":563}," '",[553,579,581],{"class":580},"sfazB","evlog\u002Fbetter-auth",[553,583,584],{"class":563},"'\n",[553,586,588],{"class":555,"line":587},2,[553,589,591],{"emptyLinePlaceholder":590},true,"\n",[553,593,595,599,602,605,608,611,614],{"class":555,"line":594},3,[553,596,598],{"class":597},"spNyl","const",[553,600,601],{"class":567}," identify ",[553,603,604],{"class":563},"=",[553,606,568],{"class":607},"s2Zo4",[553,609,610],{"class":567},"(auth",[553,612,613],{"class":563},",",[553,615,616],{"class":563}," {\n",[553,618,620,624,627,630,633,636,638,640,642,645,647,650],{"class":555,"line":619},4,[553,621,623],{"class":622},"swJcz","  exclude",[553,625,626],{"class":563},":",[553,628,629],{"class":567}," [",[553,631,632],{"class":563},"'",[553,634,635],{"class":580},"\u002Fapi\u002Fauth\u002F**",[553,637,632],{"class":563},[553,639,613],{"class":563},[553,641,577],{"class":563},[553,643,644],{"class":580},"\u002Fapi\u002Fpublic\u002F**",[553,646,632],{"class":563},[553,648,649],{"class":567},"]",[553,651,652],{"class":563},",\n",[553,654,656,659,661,663,665,668,670,672],{"class":555,"line":655},5,[553,657,658],{"class":622},"  include",[553,660,626],{"class":563},[553,662,629],{"class":567},[553,664,632],{"class":563},[553,666,667],{"class":580},"\u002Fapi\u002F**",[553,669,632],{"class":563},[553,671,649],{"class":567},[553,673,652],{"class":563},[553,675,677,680,682,686],{"class":555,"line":676},6,[553,678,679],{"class":622},"  maskEmail",[553,681,626],{"class":563},[553,683,685],{"class":684},"sfNiH"," true",[553,687,652],{"class":563},[553,689,691,694],{"class":555,"line":690},7,[553,692,693],{"class":563},"}",[553,695,696],{"class":567},")\n",[532,698,699,700,703,704,706,707,710],{},"The function signature is ",[535,701,702],{},"(log, headers, path?) => Promise\u003Cboolean>",". It resolves the session, calls ",[535,705,540],{},", captures timing into ",[535,708,709],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[712,713,336],"h2",{"id":714},"options",[532,716,717,718,725],{},"Inherits all ",[719,720,722,724],"a",{"href":721},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[535,723,540],{}," options",", plus:",[727,728,729,748],"table",{},[730,731,732],"thead",{},[733,734,735,739,742,745],"tr",{},[736,737,738],"th",{},"Option",[736,740,741],{},"Type",[736,743,744],{},"Default",[736,746,747],{},"Description",[749,750,751,772,791,810],"tbody",{},[733,752,753,759,764,769],{},[754,755,756],"td",{},[535,757,758],{},"exclude",[754,760,761],{},[535,762,763],{},"string[]",[754,765,766],{},[535,767,768],{},"['\u002Fapi\u002Fauth\u002F**']",[754,770,771],{},"Route patterns to skip (glob).",[733,773,774,779,783,788],{},[754,775,776],{},[535,777,778],{},"include",[754,780,781],{},[535,782,763],{},[754,784,785],{},[535,786,787],{},"undefined",[754,789,790],{},"If set, only matching routes are resolved.",[733,792,793,798,803,807],{},[754,794,795],{},[535,796,797],{},"onIdentify",[754,799,800],{},[535,801,802],{},"(log, session) => void",[754,804,805],{},[535,806,787],{},[754,808,809],{},"Called after successful identification.",[733,811,812,817,822,826],{},[754,813,814],{},[535,815,816],{},"onAnonymous",[754,818,819],{},[535,820,821],{},"(log) => void",[754,823,824],{},[535,825,787],{},[754,827,828],{},"Called when no session is found.",[712,830,832],{"id":831},"route-filtering","Route Filtering",[532,834,835],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[543,837,839],{"className":545,"code":838,"language":548,"meta":549,"style":549},"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",[535,840,841,857,866,881,894,908,915],{"__ignoreMap":549},[553,842,843,845,847,849,851,853,855],{"class":555,"line":556},[553,844,598],{"class":597},[553,846,601],{"class":567},[553,848,604],{"class":563},[553,850,568],{"class":607},[553,852,610],{"class":567},[553,854,613],{"class":563},[553,856,616],{"class":563},[553,858,859,861,863],{"class":555,"line":587},[553,860,623],{"class":622},[553,862,626],{"class":563},[553,864,865],{"class":567}," [\n",[553,867,868,871,873,875,877],{"class":555,"line":594},[553,869,870],{"class":563},"    '",[553,872,635],{"class":580},[553,874,632],{"class":563},[553,876,613],{"class":563},[553,878,880],{"class":879},"sHwdD","     \u002F\u002F Better Auth itself\n",[553,882,883,885,887,889,891],{"class":555,"line":619},[553,884,870],{"class":563},[553,886,644],{"class":580},[553,888,632],{"class":563},[553,890,613],{"class":563},[553,892,893],{"class":879},"   \u002F\u002F Public endpoints\n",[553,895,896,898,901,903,905],{"class":555,"line":655},[553,897,870],{"class":563},[553,899,900],{"class":580},"\u002Fapi\u002Fhealth",[553,902,632],{"class":563},[553,904,613],{"class":563},[553,906,907],{"class":879},"      \u002F\u002F Health checks\n",[553,909,910,913],{"class":555,"line":676},[553,911,912],{"class":567},"  ]",[553,914,652],{"class":563},[553,916,917,919],{"class":555,"line":690},[553,918,693],{"class":563},[553,920,696],{"class":567},[532,922,923],{},"For high-traffic apps, flip the model — only resolve sessions on routes that need them:",[543,925,927],{"className":545,"code":926,"language":548,"meta":549,"style":549},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[535,928,929,945,973],{"__ignoreMap":549},[553,930,931,933,935,937,939,941,943],{"class":555,"line":556},[553,932,598],{"class":597},[553,934,601],{"class":567},[553,936,604],{"class":563},[553,938,568],{"class":607},[553,940,610],{"class":567},[553,942,613],{"class":563},[553,944,616],{"class":563},[553,946,947,949,951,953,955,958,960,962,964,967,969,971],{"class":555,"line":587},[553,948,658],{"class":622},[553,950,626],{"class":563},[553,952,629],{"class":567},[553,954,632],{"class":563},[553,956,957],{"class":580},"\u002Fapi\u002Fdashboard\u002F**",[553,959,632],{"class":563},[553,961,613],{"class":563},[553,963,577],{"class":563},[553,965,966],{"class":580},"\u002Fapi\u002Faccount\u002F**",[553,968,632],{"class":563},[553,970,649],{"class":567},[553,972,652],{"class":563},[553,974,975,977],{"class":555,"line":594},[553,976,693],{"class":563},[553,978,696],{"class":567},[532,980,981,983,984,986,987,990,991,994,995,997,998,1000],{},[535,982,778],{}," and ",[535,985,758],{}," use glob patterns (",[535,988,989],{},"*",", ",[535,992,993],{},"**","). Provide both if you need granular control — ",[535,996,758],{}," wins over ",[535,999,778],{},".",[712,1002,1004],{"id":1003},"lifecycle-hooks","Lifecycle Hooks",[532,1006,1007,1008,1010],{},"Use ",[535,1009,797],{}," to react to user identification — for example, force-keep logs for premium users via tail sampling:",[543,1012,1014],{"className":545,"code":1013,"filename":547,"language":548,"meta":549,"style":549},"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",[535,1015,1016,1032,1059,1095,1122,1127,1132,1149,1174,1179],{"__ignoreMap":549},[553,1017,1018,1020,1022,1024,1026,1028,1030],{"class":555,"line":556},[553,1019,598],{"class":597},[553,1021,601],{"class":567},[553,1023,604],{"class":563},[553,1025,568],{"class":607},[553,1027,610],{"class":567},[553,1029,613],{"class":563},[553,1031,616],{"class":563},[553,1033,1034,1037,1039,1042,1046,1048,1051,1054,1057],{"class":555,"line":587},[553,1035,1036],{"class":607},"  onIdentify",[553,1038,626],{"class":563},[553,1040,1041],{"class":563}," (",[553,1043,1045],{"class":1044},"sHdIc","log",[553,1047,613],{"class":563},[553,1049,1050],{"class":1044}," session",[553,1052,1053],{"class":563},")",[553,1055,1056],{"class":597}," =>",[553,1058,616],{"class":563},[553,1060,1061,1064,1066,1069,1071,1074,1076,1079,1082,1084,1087,1089,1092],{"class":555,"line":594},[553,1062,1063],{"class":559},"    if",[553,1065,1041],{"class":622},[553,1067,1068],{"class":567},"session",[553,1070,1000],{"class":563},[553,1072,1073],{"class":567},"user",[553,1075,1000],{"class":563},[553,1077,1078],{"class":567},"plan",[553,1080,1081],{"class":563}," ===",[553,1083,577],{"class":563},[553,1085,1086],{"class":580},"enterprise",[553,1088,632],{"class":563},[553,1090,1091],{"class":622},") ",[553,1093,1094],{"class":563},"{\n",[553,1096,1097,1100,1102,1105,1108,1111,1114,1116,1118,1120],{"class":555,"line":619},[553,1098,1099],{"class":567},"      log",[553,1101,1000],{"class":563},[553,1103,1104],{"class":607},"set",[553,1106,1107],{"class":622},"(",[553,1109,1110],{"class":563},"{",[553,1112,1113],{"class":622}," _forceKeep",[553,1115,626],{"class":563},[553,1117,685],{"class":684},[553,1119,571],{"class":563},[553,1121,696],{"class":622},[553,1123,1124],{"class":555,"line":655},[553,1125,1126],{"class":563},"    }\n",[553,1128,1129],{"class":555,"line":676},[553,1130,1131],{"class":563},"  },\n",[553,1133,1134,1137,1139,1141,1143,1145,1147],{"class":555,"line":690},[553,1135,1136],{"class":607},"  onAnonymous",[553,1138,626],{"class":563},[553,1140,1041],{"class":563},[553,1142,1045],{"class":1044},[553,1144,1053],{"class":563},[553,1146,1056],{"class":597},[553,1148,616],{"class":563},[553,1150,1152,1155,1157,1159,1161,1163,1166,1168,1170,1172],{"class":555,"line":1151},8,[553,1153,1154],{"class":567},"    log",[553,1156,1000],{"class":563},[553,1158,1104],{"class":607},[553,1160,1107],{"class":622},[553,1162,1110],{"class":563},[553,1164,1165],{"class":622}," anonymous",[553,1167,626],{"class":563},[553,1169,685],{"class":684},[553,1171,571],{"class":563},[553,1173,696],{"class":622},[553,1175,1177],{"class":555,"line":1176},9,[553,1178,1131],{"class":563},[553,1180,1182,1184],{"class":555,"line":1181},10,[553,1183,693],{"class":563},[553,1185,696],{"class":567},[532,1187,1188,1189,1191,1192,1194,1195,1197],{},"Hooks fire after the session is resolved and ",[535,1190,540],{}," has set its fields. They run on every request that passes the ",[535,1193,778],{},"\u002F",[535,1196,758],{}," filter, so keep them fast and side-effect-free.",[1199,1200,1201,1206],"tip",{},[532,1202,1203,1204,626],{},"Common patterns for ",[535,1205,797],{},[1207,1208,1209,1213,1216],"ul",{},[1210,1211,1212],"li",{},"Force-keep audit logs for admins or high-value plans.",[1210,1214,1215],{},"Tag the request with feature flags or tenant info loaded from the session.",[1210,1217,1218],{},"Increment a per-user counter for billing.",[712,1220,1222],{"id":1221},"error-handling","Error Handling",[532,1224,1225,1226,1229,1230,983,1232,1235],{},"The middleware catches every error from ",[535,1227,1228],{},"getSession"," and logs nothing — your request keeps flowing whether the auth backend is up or down. 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Call it once at startup and reuse across requests.","md",[1249,1252],{"label":360,"icon":363,"to":361,"color":1250,"variant":1251},"neutral","subtle",{"label":374,"icon":107,"to":375,"color":1250,"variant":1251},{},{"title":365,"icon":368},{"title":527,"description":1246},"jrR5gM4N47j96nisEwXGF_GTGeo8G3av0oISM0JNjLA",[1258,1260],{"title":360,"path":361,"stem":362,"description":1259,"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":1261,"icon":320,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1785671131796]