Where to store JWT refresh tokens?
Question
Where to store JWT refresh tokens?
Solution
JWT refresh tokens should be stored securely on the server side. Here are the steps to do so:
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Create a Refresh Token: When a user logs in, along with the JWT, also generate a JWT refresh token. This token should have a longer expiry time than the regular JWT.
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Store Refresh Token: Store this refresh token in a secure server-side datastore like a SQL or NoSQL database. The refresh token should be associated with the user in the database.
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Send Refresh Token to Client: Send this refresh token along with the JWT to the client. The client should store this refresh token securely, preferably in the HttpOnly cookie.
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Use Refresh Token: When the JWT expires, the client should make a request to the server with the refresh token. The server should then check the validity of the refresh token.
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Generate New JWT: If the refresh token is valid, generate a new JWT and refresh token and send them to the client. The old refresh token should be invalidated.
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Handle Logout: On logout, the refresh token should be invalidated on the server side.
Remember, storing refresh tokens on the server side helps prevent token theft. If a JWT is stolen, it can only be used until it expires. The thief would not have access to the refresh token, so they cannot get a new JWT.
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