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Guest Authentication

Guest authentication enables applications to create temporary users without requiring credentials upfront. This is useful for allowing users to access your application immediately while deferring registration until later.

Creating a Guest User​

To create a guest user and obtain an access token, send a POST request to the token endpoint:

POST https://<CASDOOR_HOST>/api/login/oauth/access_token

Request Body:

{
    "grant_type": "authorization_code",
    "client_id": "your_client_id",
    "client_secret": "your_client_secret",
    "code": "guest-user"
}
nota

The special code value "guest-user" is a Casdoor-specific extension that triggers guest user creation instead of the standard OAuth authorization code flow.

Response:

{
    "access_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
    "id_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
    "refresh_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...",
    "token_type": "Bearer",
    "expires_in": 10080,
    "scope": "openid"
}

The system automatically creates a guest user with:

  • A randomly generated username in the format guest_<uuid>
  • A random password
  • The tag guest-user for identification

Upgrading Guest Users​

Guest users are automatically upgraded to normal users when they update their credentials through the user update API.

Upgrade triggers:

  • Changing the username to a non-guest format (not starting with guest_)
  • Setting or changing the password

After upgrade, the user's tag changes from guest-user to normal-user, enabling standard authentication.

Restrictions​

Guest users cannot sign in through the standard login flow. They must first upgrade their account by setting proper credentials. This ensures that guest users transition to permanent accounts before using password-based authentication.

Example Integration​

// Create a guest user
async function createGuestUser() {
  const response = await fetch('https://your-casdoor-host/api/login/oauth/access_token', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      grant_type: 'authorization_code',
      client_id: 'your_client_id',
      client_secret: 'your_client_secret',
      code: 'guest-user'
    })
  });
  
  const data = await response.json();
  return data.access_token;
}

// Later, upgrade the guest user
async function upgradeGuestUser(accessToken, newUsername, newPassword) {
  const response = await fetch('https://your-casdoor-host/api/update-user', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${accessToken}`
    },
    body: JSON.stringify({
      name: newUsername,
      password: newPassword
    })
  });
  
  return response.json();
}