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Call it once at startup, then use the returned function in your framework's middleware\u002Fhook system.",[538,539,545],"pre",{"className":540,"code":541,"filename":542,"language":543,"meta":544,"style":544},"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","",[530,546,547,580,587,612,648,669,683],{"__ignoreMap":544},[548,549,552,556,560,564,567,570,573,577],"span",{"class":550,"line":551},"line",1,[548,553,555],{"class":554},"s7zQu","import",[548,557,559],{"class":558},"sMK4o"," {",[548,561,563],{"class":562},"sTEyZ"," createAuthMiddleware",[548,565,566],{"class":558}," }",[548,568,569],{"class":554}," from",[548,571,572],{"class":558}," '",[548,574,576],{"class":575},"sfazB","evlog\u002Fbetter-auth",[548,578,579],{"class":558},"'\n",[548,581,583],{"class":550,"line":582},2,[548,584,586],{"emptyLinePlaceholder":585},true,"\n",[548,588,590,594,597,600,603,606,609],{"class":550,"line":589},3,[548,591,593],{"class":592},"spNyl","const",[548,595,596],{"class":562}," identify ",[548,598,599],{"class":558},"=",[548,601,563],{"class":602},"s2Zo4",[548,604,605],{"class":562},"(auth",[548,607,608],{"class":558},",",[548,610,611],{"class":558}," {\n",[548,613,615,619,622,625,628,631,633,635,637,640,642,645],{"class":550,"line":614},4,[548,616,618],{"class":617},"swJcz","  exclude",[548,620,621],{"class":558},":",[548,623,624],{"class":562}," [",[548,626,627],{"class":558},"'",[548,629,630],{"class":575},"\u002Fapi\u002Fauth\u002F**",[548,632,627],{"class":558},[548,634,608],{"class":558},[548,636,572],{"class":558},[548,638,639],{"class":575},"\u002Fapi\u002Fpublic\u002F**",[548,641,627],{"class":558},[548,643,644],{"class":562},"]",[548,646,647],{"class":558},",\n",[548,649,651,654,656,658,660,663,665,667],{"class":550,"line":650},5,[548,652,653],{"class":617},"  include",[548,655,621],{"class":558},[548,657,624],{"class":562},[548,659,627],{"class":558},[548,661,662],{"class":575},"\u002Fapi\u002F**",[548,664,627],{"class":558},[548,666,644],{"class":562},[548,668,647],{"class":558},[548,670,672,675,677,681],{"class":550,"line":671},6,[548,673,674],{"class":617},"  maskEmail",[548,676,621],{"class":558},[548,678,680],{"class":679},"sfNiH"," true",[548,682,647],{"class":558},[548,684,686,689],{"class":550,"line":685},7,[548,687,688],{"class":558},"}",[548,690,691],{"class":562},")\n",[527,693,694,695,698,699,701,702,705],{},"The function signature is ",[530,696,697],{},"(log, headers, path?) => Promise\u003Cboolean>",". It resolves the session, calls ",[530,700,535],{},", captures timing into ",[530,703,704],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[707,708,331],"h2",{"id":709},"options",[527,711,712,713,720],{},"Inherits all ",[714,715,717,719],"a",{"href":716},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[530,718,535],{}," options",", plus:",[722,723,724,743],"table",{},[725,726,727],"thead",{},[728,729,730,734,737,740],"tr",{},[731,732,733],"th",{},"Option",[731,735,736],{},"Type",[731,738,739],{},"Default",[731,741,742],{},"Description",[744,745,746,767,786,805],"tbody",{},[728,747,748,754,759,764],{},[749,750,751],"td",{},[530,752,753],{},"exclude",[749,755,756],{},[530,757,758],{},"string[]",[749,760,761],{},[530,762,763],{},"['\u002Fapi\u002Fauth\u002F**']",[749,765,766],{},"Route patterns to skip (glob).",[728,768,769,774,778,783],{},[749,770,771],{},[530,772,773],{},"include",[749,775,776],{},[530,777,758],{},[749,779,780],{},[530,781,782],{},"undefined",[749,784,785],{},"If set, only matching routes are resolved.",[728,787,788,793,798,802],{},[749,789,790],{},[530,791,792],{},"onIdentify",[749,794,795],{},[530,796,797],{},"(log, session) => void",[749,799,800],{},[530,801,782],{},[749,803,804],{},"Called after successful identification.",[728,806,807,812,817,821],{},[749,808,809],{},[530,810,811],{},"onAnonymous",[749,813,814],{},[530,815,816],{},"(log) => void",[749,818,819],{},[530,820,782],{},[749,822,823],{},"Called when no session is found.",[707,825,827],{"id":826},"route-filtering","Route Filtering",[527,829,830],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[538,832,834],{"className":540,"code":833,"language":543,"meta":544,"style":544},"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",[530,835,836,852,861,876,889,903,910],{"__ignoreMap":544},[548,837,838,840,842,844,846,848,850],{"class":550,"line":551},[548,839,593],{"class":592},[548,841,596],{"class":562},[548,843,599],{"class":558},[548,845,563],{"class":602},[548,847,605],{"class":562},[548,849,608],{"class":558},[548,851,611],{"class":558},[548,853,854,856,858],{"class":550,"line":582},[548,855,618],{"class":617},[548,857,621],{"class":558},[548,859,860],{"class":562}," [\n",[548,862,863,866,868,870,872],{"class":550,"line":589},[548,864,865],{"class":558},"    '",[548,867,630],{"class":575},[548,869,627],{"class":558},[548,871,608],{"class":558},[548,873,875],{"class":874},"sHwdD","     \u002F\u002F Better Auth itself\n",[548,877,878,880,882,884,886],{"class":550,"line":614},[548,879,865],{"class":558},[548,881,639],{"class":575},[548,883,627],{"class":558},[548,885,608],{"class":558},[548,887,888],{"class":874},"   \u002F\u002F Public endpoints\n",[548,890,891,893,896,898,900],{"class":550,"line":650},[548,892,865],{"class":558},[548,894,895],{"class":575},"\u002Fapi\u002Fhealth",[548,897,627],{"class":558},[548,899,608],{"class":558},[548,901,902],{"class":874},"      \u002F\u002F Health checks\n",[548,904,905,908],{"class":550,"line":671},[548,906,907],{"class":562},"  ]",[548,909,647],{"class":558},[548,911,912,914],{"class":550,"line":685},[548,913,688],{"class":558},[548,915,691],{"class":562},[527,917,918],{},"For high-traffic apps, flip the model — only resolve sessions on routes that need them:",[538,920,922],{"className":540,"code":921,"language":543,"meta":544,"style":544},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[530,923,924,940,968],{"__ignoreMap":544},[548,925,926,928,930,932,934,936,938],{"class":550,"line":551},[548,927,593],{"class":592},[548,929,596],{"class":562},[548,931,599],{"class":558},[548,933,563],{"class":602},[548,935,605],{"class":562},[548,937,608],{"class":558},[548,939,611],{"class":558},[548,941,942,944,946,948,950,953,955,957,959,962,964,966],{"class":550,"line":582},[548,943,653],{"class":617},[548,945,621],{"class":558},[548,947,624],{"class":562},[548,949,627],{"class":558},[548,951,952],{"class":575},"\u002Fapi\u002Fdashboard\u002F**",[548,954,627],{"class":558},[548,956,608],{"class":558},[548,958,572],{"class":558},[548,960,961],{"class":575},"\u002Fapi\u002Faccount\u002F**",[548,963,627],{"class":558},[548,965,644],{"class":562},[548,967,647],{"class":558},[548,969,970,972],{"class":550,"line":589},[548,971,688],{"class":558},[548,973,691],{"class":562},[527,975,976,978,979,981,982,985,986,989,990,992,993,995],{},[530,977,773],{}," and ",[530,980,753],{}," use glob patterns (",[530,983,984],{},"*",", ",[530,987,988],{},"**","). Provide both if you need granular control — ",[530,991,753],{}," wins over ",[530,994,773],{},".",[707,997,999],{"id":998},"lifecycle-hooks","Lifecycle Hooks",[527,1001,1002,1003,1005],{},"Use ",[530,1004,792],{}," to react to user identification — for example, force-keep logs for premium users via tail sampling:",[538,1007,1009],{"className":540,"code":1008,"filename":542,"language":543,"meta":544,"style":544},"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",[530,1010,1011,1027,1054,1090,1117,1122,1127,1144,1169,1174],{"__ignoreMap":544},[548,1012,1013,1015,1017,1019,1021,1023,1025],{"class":550,"line":551},[548,1014,593],{"class":592},[548,1016,596],{"class":562},[548,1018,599],{"class":558},[548,1020,563],{"class":602},[548,1022,605],{"class":562},[548,1024,608],{"class":558},[548,1026,611],{"class":558},[548,1028,1029,1032,1034,1037,1041,1043,1046,1049,1052],{"class":550,"line":582},[548,1030,1031],{"class":602},"  onIdentify",[548,1033,621],{"class":558},[548,1035,1036],{"class":558}," (",[548,1038,1040],{"class":1039},"sHdIc","log",[548,1042,608],{"class":558},[548,1044,1045],{"class":1039}," session",[548,1047,1048],{"class":558},")",[548,1050,1051],{"class":592}," =>",[548,1053,611],{"class":558},[548,1055,1056,1059,1061,1064,1066,1069,1071,1074,1077,1079,1082,1084,1087],{"class":550,"line":589},[548,1057,1058],{"class":554},"    if",[548,1060,1036],{"class":617},[548,1062,1063],{"class":562},"session",[548,1065,995],{"class":558},[548,1067,1068],{"class":562},"user",[548,1070,995],{"class":558},[548,1072,1073],{"class":562},"plan",[548,1075,1076],{"class":558}," ===",[548,1078,572],{"class":558},[548,1080,1081],{"class":575},"enterprise",[548,1083,627],{"class":558},[548,1085,1086],{"class":617},") ",[548,1088,1089],{"class":558},"{\n",[548,1091,1092,1095,1097,1100,1103,1106,1109,1111,1113,1115],{"class":550,"line":614},[548,1093,1094],{"class":562},"      log",[548,1096,995],{"class":558},[548,1098,1099],{"class":602},"set",[548,1101,1102],{"class":617},"(",[548,1104,1105],{"class":558},"{",[548,1107,1108],{"class":617}," _forceKeep",[548,1110,621],{"class":558},[548,1112,680],{"class":679},[548,1114,566],{"class":558},[548,1116,691],{"class":617},[548,1118,1119],{"class":550,"line":650},[548,1120,1121],{"class":558},"    }\n",[548,1123,1124],{"class":550,"line":671},[548,1125,1126],{"class":558},"  },\n",[548,1128,1129,1132,1134,1136,1138,1140,1142],{"class":550,"line":685},[548,1130,1131],{"class":602},"  onAnonymous",[548,1133,621],{"class":558},[548,1135,1036],{"class":558},[548,1137,1040],{"class":1039},[548,1139,1048],{"class":558},[548,1141,1051],{"class":592},[548,1143,611],{"class":558},[548,1145,1147,1150,1152,1154,1156,1158,1161,1163,1165,1167],{"class":550,"line":1146},8,[548,1148,1149],{"class":562},"    log",[548,1151,995],{"class":558},[548,1153,1099],{"class":602},[548,1155,1102],{"class":617},[548,1157,1105],{"class":558},[548,1159,1160],{"class":617}," anonymous",[548,1162,621],{"class":558},[548,1164,680],{"class":679},[548,1166,566],{"class":558},[548,1168,691],{"class":617},[548,1170,1172],{"class":550,"line":1171},9,[548,1173,1126],{"class":558},[548,1175,1177,1179],{"class":550,"line":1176},10,[548,1178,688],{"class":558},[548,1180,691],{"class":562},[527,1182,1183,1184,1186,1187,1189,1190,1192],{},"Hooks fire after the session is resolved and ",[530,1185,535],{}," has set its fields. They run on every request that passes the ",[530,1188,773],{},"\u002F",[530,1191,753],{}," filter, so keep them fast and side-effect-free.",[1194,1195,1196,1201],"tip",{},[527,1197,1198,1199,621],{},"Common patterns for ",[530,1200,792],{},[1202,1203,1204,1208,1211],"ul",{},[1205,1206,1207],"li",{},"Force-keep audit logs for admins or high-value plans.",[1205,1209,1210],{},"Tag the request with feature flags or tenant info loaded from the session.",[1205,1212,1213],{},"Increment a per-user counter for billing.",[707,1215,1217],{"id":1216},"error-handling","Error Handling",[527,1219,1220,1221,1224,1225,978,1227,1230],{},"The middleware catches every error from ",[530,1222,1223],{},"getSession"," and logs nothing — your request keeps flowing whether the auth backend is up or down. The wide event still includes ",[530,1226,704],{},[530,1228,1229],{},"auth.identified: false"," so you can alert on session resolution health from your dashboards.",[1232,1233,1234],"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":544,"searchDepth":582,"depth":582,"links":1236},[1237,1238,1239,1240],{"id":709,"depth":582,"text":331},{"id":826,"depth":582,"text":827},{"id":998,"depth":582,"text":999},{"id":1216,"depth":582,"text":1217},"Framework-agnostic factory with route filtering, session timing, and lifecycle hooks. Call it once at startup and reuse across requests.","md",[1244,1247],{"label":355,"icon":358,"to":356,"color":1245,"variant":1246},"neutral","subtle",{"label":369,"icon":107,"to":370,"color":1245,"variant":1246},{},{"title":360,"icon":363},{"title":522,"description":1241},"jrR5gM4N47j96nisEwXGF_GTGeo8G3av0oISM0JNjLA",[1253,1255],{"title":355,"path":356,"stem":357,"description":1254,"icon":358,"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":365,"path":366,"stem":367,"description":1256,"icon":315,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1785665724457]