.

src/main/kotlin/me/wypark/blogbackend/domain/auth/CustomUserDetails.kt

@@ -0,0 +1,12 @@
+package me.wypark.blogbackend.domain.auth
+
+import org.springframework.security.core.GrantedAuthority
+import org.springframework.security.core.userdetails.User
+
+class CustomUserDetails(
+    val memberId: Long,
+    val nickname: String,
+    username: String,
+    password: String,
+    authorities: Collection<GrantedAuthority>
+) : User(username, password, authorities)

src/main/kotlin/me/wypark/blogbackend/domain/auth/CustomUserDetailsService.kt

@@ -3,7 +3,6 @@ package me.wypark.blogbackend.domain.auth
 import me.wypark.blogbackend.domain.user.Member
 import me.wypark.blogbackend.domain.user.MemberRepository
 import org.springframework.security.core.authority.SimpleGrantedAuthority
-import org.springframework.security.core.userdetails.User
 import org.springframework.security.core.userdetails.UserDetails
 import org.springframework.security.core.userdetails.UserDetailsService
 import org.springframework.security.core.userdetails.UsernameNotFoundException
@@ -21,10 +20,13 @@ class CustomUserDetailsService(
     }
 
     private fun createUserDetails(member: Member): UserDetails {
-        return User(
-            member.email,
-            member.password,
-            listOf(SimpleGrantedAuthority(member.role.name))
+        // [수정] 표준 User 객체 대신, ID와 닉네임을 포함하는 CustomUserDetails 반환
+        return CustomUserDetails(
+            memberId = member.id!!,      // 토큰에 넣을 ID
+            nickname = member.nickname,  // 토큰에 넣을 닉네임
+            username = member.email,
+            password = member.password,
+            authorities = listOf(SimpleGrantedAuthority(member.role.name))
         )
     }
 }