fix(auth): show "account already exists" on duplicate email signup (#4855)

* fix(auth): show "account already exists" on duplicate email signup * fix(auth): use exact path match for duplicate-email signup check
2026-09-24 15:45:35 +08:00 · 2026-06-02 18:54:53 -07:00
parent 12db7da938
commit 1cb5a1653b
1 changed files with 16 additions and 0 deletions
@@ -844,6 +844,22 @@ export const auth = betterAuth({
        }
      }

+      if (ctx.path === '/sign-up/email' && ctx.body?.email) {
+        const signupEmail = ctx.body.email.toLowerCase()
+        const [existingUser] = await db
+          .select({ id: schema.user.id })
+          .from(schema.user)
+          .where(eq(schema.user.email, signupEmail))
+          .limit(1)
+
+        if (existingUser) {
+          throw new APIError('UNPROCESSABLE_ENTITY', {
+            message: 'User already exists',
+            code: 'USER_ALREADY_EXISTS',
+          })
+        }
+      }
+
      return
    }),
  },