{
  "username": "johndoe",
  "email": "john@example.com",
  "password": "SuperSecretPassword123!"
}

{
  "message": "User registered successfully",
  "user": {
    "id": 42,
    "username": "johndoe",
    "email": "john@example.com",
    "created_at": "2026-09-20T10:00:00Z"
  }
}

{
  "username_or_email": "johndoe",
  "password": "SuperSecretPassword123!"
}

{
  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
  "user": {
    "id": 42,
    "username": "johndoe",
    "email": "john@example.com"
  }
}

Authorization: Bearer <token>

{
  "id": 42,
  "username": "johndoe",
  "email": "john@example.com",
  "created_at": "2026-09-20T10:00:00Z"
}

{
  "username": "john_updated",
  "email": "john.new@example.com"
}

{
  "old_password": "SuperSecretPassword123!",
  "new_password": "NewUltraSecurePassword456!"
}