How JWT refresh tokens work?

Refresh token: The refresh token is used to generate a new access token. Typically, if the access token has an expiration date, once it expires, the user would have to authenticate again to obtain an access token.

How does a refresh token work?

Once they expire, client applications can use a refresh token to “refresh” the access token. That is, a refresh token is a credential artifact that lets a client application get new access tokens without having to ask the user to log in again.

How is refresh token generated?

Explanation. Refresh tokens are random strings generated by the authentication server. They are generated after successful authentication (for example, if the username and password of the user are valid). Their sole purpose is to remove the need to exchange user credentials repeatedly.

How does access token and refresh token work?

7 Answers

  1. Access tokens are issued to third-party clients by an authorization server with the approval of the resource owner. The client uses the access token to access the protected resources hosted by the resource server.
  2. Refresh Tokens are credentials used to obtain access tokens.
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How long should JWT refresh tokens last?

Authentication is implemented through JWT access tokens along with refresh tokens. The API returns a short-lived token (JWT), which expires in 15 minutes, and in HTTP cookies, the refresh token expires in 7 days.

How do I get the JWT refresh token?

The client (Front end) will store refresh token in his local storage and access token in cookies. The client will use an access token for calling APIs. But when it expires, pick the refresh token from local storage and call auth server API to get the new token.

How do you check JWT token is expired or not?

There are two ways to check if Token is expired or not.

  1. get expiry time in JWT and compare with current time.
  2. read response status from the server.

How do I check my refresh token?

What is the workflow for validating a refresh token and issuing a new bearer token?

  1. Check that it is not expired.
  2. Check that it has not been revoked.
  3. Use the UserName in the refresh token to issue a new short-lived bearer token.

How do you handle expired JWT tokens?

how should I handle an expired JWT

  1. set a timeout that will execute an API call to get a new access token after 15 minutes (let’s say 14.5 minutes to be on the safe side)
  2. set an interceptor that will check if the token is still valid and if not first get a new token and then continue with the request.

What happens when JWT token expires?

The JWT access token is only valid for a finite period of time. Using an expired JWT will cause operations to fail.

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Should you use refresh tokens?

So why does a web application need a refresh token? The main reason to use refresh tokens in web applications is to reduce the lifetime of an access token. When a web application obtains an access token with a lifetime of five to 10 minutes, that token will likely expire while the user is using the application.

How do you handle refresh token?

To use the refresh token, make a POST request to the service’s token endpoint with grant_type=refresh_token , and include the refresh token as well as the client credentials.

Should you store refresh token in DB?

Store refresh tokens in a secure location, such as a password-protected file system or an encrypted database. Limit access to users who need the tokens to make API calls. If you believe that a refresh token has been accessed by an unauthorized user, delete it and create a new one.

How do I make my JWT token not expire?

3 Answers

  1. retrieve the user info and Check whether the token is in his User database. If so allow.
  2. When user logs out, remove only this token from his user database.
  3. When user changes his password, remove all tokens from his user database and ask him to login again.

Why are refresh tokens more secure?

The reason for that is the sensitivity of this piece of information. You can think of it as user credentials, since a Refresh Token allows a user to remain authenticated essentially forever. Therefore you cannot have this information in a browser, it must be stored securely.

How do I know if my refresh token is expired?

This can be done using the following steps:

  1. convert expires_in to an expire time (epoch, RFC-3339/ISO-8601 datetime, etc.)
  2. store the expire time.
  3. on each resource request, check the current time against the expire time and make a token refresh request before the resource request if the access_token has expired.
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