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It resolves the session, calls ",[474,644,479],{},", captures timing into ",[474,647,648],{},"auth.resolvedIn",", fires lifecycle hooks, and silently catches errors so session resolution never breaks a request.",[651,652,274],"h2",{"id":653},"options",[471,655,656,657,664],{},"Inherits all ",[658,659,661,663],"a",{"href":660},"\u002Fuse-cases\u002Fbetter-auth\u002Fidentify-user#options",[474,662,479],{}," options",", plus:",[666,667,668,687],"table",{},[669,670,671],"thead",{},[672,673,674,678,681,684],"tr",{},[675,676,677],"th",{},"Option",[675,679,680],{},"Type",[675,682,683],{},"Default",[675,685,686],{},"Description",[688,689,690,711,730,749],"tbody",{},[672,691,692,698,703,708],{},[693,694,695],"td",{},[474,696,697],{},"exclude",[693,699,700],{},[474,701,702],{},"string[]",[693,704,705],{},[474,706,707],{},"['\u002Fapi\u002Fauth\u002F**']",[693,709,710],{},"Route patterns to skip (glob).",[672,712,713,718,722,727],{},[693,714,715],{},[474,716,717],{},"include",[693,719,720],{},[474,721,702],{},[693,723,724],{},[474,725,726],{},"undefined",[693,728,729],{},"If set, only matching routes are resolved.",[672,731,732,737,742,746],{},[693,733,734],{},[474,735,736],{},"onIdentify",[693,738,739],{},[474,740,741],{},"(log, session) => void",[693,743,744],{},[474,745,726],{},[693,747,748],{},"Called after successful identification.",[672,750,751,756,761,765],{},[693,752,753],{},[474,754,755],{},"onAnonymous",[693,757,758],{},[474,759,760],{},"(log) => void",[693,762,763],{},[474,764,726],{},[693,766,767],{},"Called when no session is found.",[651,769,771],{"id":770},"route-filtering","Route Filtering",[471,773,774],{},"Skip Better Auth's own routes and any public endpoints to avoid wasted database queries:",[482,776,778],{"className":484,"code":777,"language":487,"meta":488,"style":488},"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",[474,779,780,796,805,820,833,847,854],{"__ignoreMap":488},[492,781,782,784,786,788,790,792,794],{"class":494,"line":495},[492,783,537],{"class":536},[492,785,540],{"class":506},[492,787,543],{"class":502},[492,789,507],{"class":546},[492,791,549],{"class":506},[492,793,552],{"class":502},[492,795,555],{"class":502},[492,797,798,800,802],{"class":494,"line":526},[492,799,562],{"class":561},[492,801,565],{"class":502},[492,803,804],{"class":506}," [\n",[492,806,807,810,812,814,816],{"class":494,"line":533},[492,808,809],{"class":502},"    '",[492,811,574],{"class":519},[492,813,571],{"class":502},[492,815,552],{"class":502},[492,817,819],{"class":818},"sHwdD","     \u002F\u002F Better Auth itself\n",[492,821,822,824,826,828,830],{"class":494,"line":558},[492,823,809],{"class":502},[492,825,583],{"class":519},[492,827,571],{"class":502},[492,829,552],{"class":502},[492,831,832],{"class":818},"   \u002F\u002F Public endpoints\n",[492,834,835,837,840,842,844],{"class":494,"line":594},[492,836,809],{"class":502},[492,838,839],{"class":519},"\u002Fapi\u002Fhealth",[492,841,571],{"class":502},[492,843,552],{"class":502},[492,845,846],{"class":818},"      \u002F\u002F Health checks\n",[492,848,849,852],{"class":494,"line":615},[492,850,851],{"class":506},"  ]",[492,853,591],{"class":502},[492,855,856,858],{"class":494,"line":629},[492,857,632],{"class":502},[492,859,635],{"class":506},[471,861,862],{},"For high-traffic apps, flip the model — only resolve sessions on routes that need them:",[482,864,866],{"className":484,"code":865,"language":487,"meta":488,"style":488},"const identify = createAuthMiddleware(auth, {\n  include: ['\u002Fapi\u002Fdashboard\u002F**', '\u002Fapi\u002Faccount\u002F**'],\n})\n",[474,867,868,884,912],{"__ignoreMap":488},[492,869,870,872,874,876,878,880,882],{"class":494,"line":495},[492,871,537],{"class":536},[492,873,540],{"class":506},[492,875,543],{"class":502},[492,877,507],{"class":546},[492,879,549],{"class":506},[492,881,552],{"class":502},[492,883,555],{"class":502},[492,885,886,888,890,892,894,897,899,901,903,906,908,910],{"class":494,"line":526},[492,887,597],{"class":561},[492,889,565],{"class":502},[492,891,568],{"class":506},[492,893,571],{"class":502},[492,895,896],{"class":519},"\u002Fapi\u002Fdashboard\u002F**",[492,898,571],{"class":502},[492,900,552],{"class":502},[492,902,516],{"class":502},[492,904,905],{"class":519},"\u002Fapi\u002Faccount\u002F**",[492,907,571],{"class":502},[492,909,588],{"class":506},[492,911,591],{"class":502},[492,913,914,916],{"class":494,"line":533},[492,915,632],{"class":502},[492,917,635],{"class":506},[471,919,920,922,923,925,926,929,930,933,934,936,937,939],{},[474,921,717],{}," and ",[474,924,697],{}," use glob patterns (",[474,927,928],{},"*",", ",[474,931,932],{},"**","). Provide both if you need granular control — ",[474,935,697],{}," wins over ",[474,938,717],{},".",[651,941,943],{"id":942},"lifecycle-hooks","Lifecycle Hooks",[471,945,946,947,949],{},"Use ",[474,948,736],{}," to react to user identification — for example, force-keep logs for premium users via tail sampling:",[482,951,953],{"className":484,"code":952,"filename":486,"language":487,"meta":488,"style":488},"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",[474,954,955,971,998,1034,1061,1066,1071,1088,1113,1118],{"__ignoreMap":488},[492,956,957,959,961,963,965,967,969],{"class":494,"line":495},[492,958,537],{"class":536},[492,960,540],{"class":506},[492,962,543],{"class":502},[492,964,507],{"class":546},[492,966,549],{"class":506},[492,968,552],{"class":502},[492,970,555],{"class":502},[492,972,973,976,978,981,985,987,990,993,996],{"class":494,"line":526},[492,974,975],{"class":546},"  onIdentify",[492,977,565],{"class":502},[492,979,980],{"class":502}," (",[492,982,984],{"class":983},"sHdIc","log",[492,986,552],{"class":502},[492,988,989],{"class":983}," session",[492,991,992],{"class":502},")",[492,994,995],{"class":536}," =>",[492,997,555],{"class":502},[492,999,1000,1003,1005,1008,1010,1013,1015,1018,1021,1023,1026,1028,1031],{"class":494,"line":533},[492,1001,1002],{"class":498},"    if",[492,1004,980],{"class":561},[492,1006,1007],{"class":506},"session",[492,1009,939],{"class":502},[492,1011,1012],{"class":506},"user",[492,1014,939],{"class":502},[492,1016,1017],{"class":506},"plan",[492,1019,1020],{"class":502}," ===",[492,1022,516],{"class":502},[492,1024,1025],{"class":519},"enterprise",[492,1027,571],{"class":502},[492,1029,1030],{"class":561},") ",[492,1032,1033],{"class":502},"{\n",[492,1035,1036,1039,1041,1044,1047,1050,1053,1055,1057,1059],{"class":494,"line":558},[492,1037,1038],{"class":506},"      log",[492,1040,939],{"class":502},[492,1042,1043],{"class":546},"set",[492,1045,1046],{"class":561},"(",[492,1048,1049],{"class":502},"{",[492,1051,1052],{"class":561}," _forceKeep",[492,1054,565],{"class":502},[492,1056,624],{"class":623},[492,1058,510],{"class":502},[492,1060,635],{"class":561},[492,1062,1063],{"class":494,"line":594},[492,1064,1065],{"class":502},"    }\n",[492,1067,1068],{"class":494,"line":615},[492,1069,1070],{"class":502},"  },\n",[492,1072,1073,1076,1078,1080,1082,1084,1086],{"class":494,"line":629},[492,1074,1075],{"class":546},"  onAnonymous",[492,1077,565],{"class":502},[492,1079,980],{"class":502},[492,1081,984],{"class":983},[492,1083,992],{"class":502},[492,1085,995],{"class":536},[492,1087,555],{"class":502},[492,1089,1091,1094,1096,1098,1100,1102,1105,1107,1109,1111],{"class":494,"line":1090},8,[492,1092,1093],{"class":506},"    log",[492,1095,939],{"class":502},[492,1097,1043],{"class":546},[492,1099,1046],{"class":561},[492,1101,1049],{"class":502},[492,1103,1104],{"class":561}," anonymous",[492,1106,565],{"class":502},[492,1108,624],{"class":623},[492,1110,510],{"class":502},[492,1112,635],{"class":561},[492,1114,1116],{"class":494,"line":1115},9,[492,1117,1070],{"class":502},[492,1119,1121,1123],{"class":494,"line":1120},10,[492,1122,632],{"class":502},[492,1124,635],{"class":506},[471,1126,1127,1128,1130,1131,1133,1134,1136],{},"Hooks fire after the session is resolved and ",[474,1129,479],{}," has set its fields. They run on every request that passes the ",[474,1132,717],{},"\u002F",[474,1135,697],{}," filter, so keep them fast and side-effect-free.",[1138,1139,1140,1145],"tip",{},[471,1141,1142,1143,565],{},"Common patterns for ",[474,1144,736],{},[1146,1147,1148,1152,1155],"ul",{},[1149,1150,1151],"li",{},"Force-keep audit logs for admins or high-value plans.",[1149,1153,1154],{},"Tag the request with feature flags or tenant info loaded from the session.",[1149,1156,1157],{},"Increment a per-user counter for billing.",[651,1159,1161],{"id":1160},"error-handling","Error Handling",[471,1163,1164,1165,1168,1169,922,1171,1174],{},"The middleware catches every error from ",[474,1166,1167],{},"getSession"," and logs nothing — your request keeps flowing whether the auth backend is up or down. The wide event still includes ",[474,1170,648],{},[474,1172,1173],{},"auth.identified: false"," so you can alert on session resolution health from your dashboards.",[1176,1177,1178],"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":488,"searchDepth":526,"depth":526,"links":1180},[1181,1182,1183,1184],{"id":653,"depth":526,"text":274},{"id":770,"depth":526,"text":771},{"id":942,"depth":526,"text":943},{"id":1160,"depth":526,"text":1161},"Framework-agnostic factory with route filtering, session timing, and lifecycle hooks. Call it once at startup and reuse across requests.","md",[1188,1191],{"label":298,"icon":301,"to":299,"color":1189,"variant":1190},"neutral","subtle",{"label":312,"icon":315,"to":313,"color":1189,"variant":1190},{},{"title":303,"icon":306},{"title":466,"description":1185},"Ft-jGRp0Xs3NjYmYAXhrK-z4jsNG1S1GJbOMZWpMh0E",[1197,1199],{"title":298,"path":299,"stem":300,"description":1198,"icon":301,"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":308,"path":309,"stem":310,"description":1200,"icon":258,"children":-1},"Mirror the server-side user identity into client-side logs by watching the Better Auth session and calling setIdentity.",1784203200793]