Advanced Token Refresh Strategies

1. Introduction

In modern web applications, maintaining user session security is paramount. This lesson explores advanced strategies for refreshing tokens to enhance security in front-end applications, specifically focusing on JSON Web Tokens (JWT) and OAuth.

2. Token Refresh Strategies

Token refresh strategies are essential to ensure that users remain authenticated while minimizing the risk of token theft. Below are common strategies:

2.1 Refresh Token Rotation

This strategy involves issuing a new refresh token every time the old one is used. This limits the time frame for which a stolen refresh token can be used.

function refreshAccessToken(refreshToken) {
    return fetch('/api/token/refresh', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ refreshToken })
    })
    .then(response => response.json())
    .then(data => {
        // Update tokens in local storage
        localStorage.setItem('accessToken', data.accessToken);
        localStorage.setItem('refreshToken', data.refreshToken);
    });
}

2.2 Silent Refresh

Silent refresh allows for automatic token renewal without user interaction, usually using an iframe to make a hidden request.

2.3 Short-lived Access Tokens

Access tokens should have a short lifespan. This minimizes damage in case they are compromised. Use refresh tokens to obtain new access tokens.

2.4 Token Blacklisting

Maintain a blacklist of revoked tokens. This can be useful for logging out users or invalidating tokens upon suspicious activity.

3. Best Practices

To enhance the security of your token refresh strategy, consider the following best practices:

4. FAQ