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Is it safe to store user ID in JWT?
In most cases you don’t need the whole user data and ID will do good in most cases. So I would recommend to store ID (may be some other field too as required) in JWT instead of all the user’s data. However, you should not include any information in the token which the user could abuse within your system.
What makes JWT secure?
The asymmetric nature of public key cryptography makes JWT signature verification possible. A public key verifies a JWT was signed by its matching private key. No other combination of keys can do this verification, thus preventing impersonation attempts.
Is it okay to log JWT token?
JWTs are just one standard for an authentication token. They can be used for pretty much anything. The reason JWTs are sort of cool is that you can embed extra information in them, and you can validate that nobody has messed with it (signing). HOWEVER, JWTs themselves have nothing to do with ‘security’.
What happens if you dont have a JWT token?
First this is what happens if we try to access a protected route without a JWT token: The 403 is also thrown when the token is invalid. So just as the code dictated in the /user/login GET route starting on line 24, when we fail to access a protected route with a JWT token, the callback in jwt.verify () returns err.
How to use JWT to authorize users and protect?
Notice that the password and username match that of our sole mock user. Since everything matched and the user was ‘logged in’, the jwt.sign () function found in the login route returned a unique JWT token. Perfect, exactly what we want. This token is what will be used to access our protected routes.
What happens when you fail to access a protected route with JWT?
So just as the code dictated in the /user/login GET route starting on line 24, when we fail to access a protected route with a JWT token, the callback in jwt.verify () returns err. This error lets us send out the 403 Forbidden bat signal to whatever failed to request the route.
Which is the best use case for JWT?
Arguably one of the largest use cases for JWT is authorization. We can generate a JWT token in the backend that is specific to a user, pass this JWT token to the frontend, and then our frontend can send this token alongside requests to access protected API routes.