How to expire jwt token on logout in node js

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How to expire JWT token on logout in Node.js

In order to expire a JWT token on logout in Node.js, you can modify the token expiration time or remove the token from your system entirely. Here are a few approaches you can take:

1. Modifying token expiration time:

One way to handle token expiration on logout is to set the token’s expiration time to a past date or time. This way, when a user logs out, their token will not be valid anymore.

    
    const jwt = require('jsonwebtoken');
    const secretKey = 'your-secret-key';

    // Generate token on login
    const token = jwt.sign({ userId: 'user123' }, secretKey, { expiresIn: '1h' });

    // Expire token on logout
    function expireToken(token) {
        const invalidatedToken = jwt.decode(token);
        invalidatedToken.exp = 0; // Set expiration time to 0 to invalidate the token
        const newToken = jwt.sign(invalidatedToken, secretKey);
        return newToken;
    }

2. Removing token from system:

Alternatively, you can remove the token from your system entirely on logout. This could be done by storing the token in a database or a cache system and deleting it on logout.

    
    // Store token on login
    const token = 'your-token';
    // Store token in a database using a library like mongoose, if desired
    
    // Remove token on logout
    function removeToken(token) {
        // Remove token from database or cache system
    }

3. Using token revocation lists:

Another approach is to maintain a token revocation list where you store the revoked tokens. On logout, you can add the token to this list and check if a token exists in the list during authentication.

    
    // Store token on login
    const token = 'your-token';
    // Store token in a token revocation list in a database using a library like mongoose, if desired
    
    // Check token validity during authentication
    function checkToken(token) {
        // Query the token revocation list to check if token is revoked before allowing authentication
    }

These are just a few ways to handle expiring JWT tokens on logout in Node.js. The specific implementation will depend on your application requirements and the tools you’re using.

I hope this helps! Let me know if you have any further questions.

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