Free Authentication API — Mock REST API for Testing & Development
Building authentication flows is often the first bottleneck when scaffolding a new frontend application. The Authentication API provides realistic mock endpoints for user login, registration, session validation, and logout. It returns mock JWT access tokens and user profile objects, allowing you to test login forms, protected routes, and auth context states without spinning up a database.
Interactive Live API Explorer
/api/auth/login
Authenticates a user and returns a session token.
/api/auth/logout
Logs out the current user and invalidates their session.
/api/auth/status
Checks the current authentication status of the user.
You can add or change query parameters in the path above (e.g., ?name=User).
Code Integration Examples
// Free Authentication API - JavaScript Fetch Example
async function fetchAuthenticationAPI() {
try {
const response = await fetch('https://gen-endpoint.com/api/auth/login', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({
"email": "alice@example.com",
"password": "securepassword123"
}),
});
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
console.log('Success:', data);
return data;
} catch (error) {
console.error('Fetch error:', error);
}
}
fetchAuthenticationAPI();Sample JSON Response
{
"message": "Login successful.",
"user": {"id": "usr_1", "name": "Alice Wonderland", "email": "alice@example.com", "role": "admin"},
"token": "mock_jwt_token_string_12345",
"expiresAt": "2024-08-17T10:00:00Z"
}Common Developer Use Cases
Testing React/Next.js AuthContext, Redux auth slices, and Zustand stores.
Validating login form UI, error banners, and loading indicators.
Prototyping protected route navigation guards and redirect logic.
Testing token expiration and simulated refresh token cycles.
Related Free REST APIs
User Management API
A comprehensive API for managing user accounts, including CRUD operations.
Rate Limiting API
Demonstrate rate limiting patterns, quota management, and different tier restrictions.
Shopping Cart API
Manage shopping cart operations with session handling, item management, and checkout preparation.
Payment Processing API
Handle payment flows, refunds, and transaction history with multiple payment methods.
Frequently Asked Questions
Are real passwords or credentials required?
No. Any valid email format and non-empty password will generate a successful mock token response.
What format is the returned token?
The endpoint returns a simulated JWT token string alongside user metadata (id, email, name, role).
How do I test invalid login credentials?
Send empty strings or invalid email formats to observe simulated 400 Bad Request responses.
Can I verify token status?
Yes, call GET /api/auth/status with your Bearer token in the Authorization header to test token validation logic.