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What does jwt.sign ( ) do in jwt?


Asked by Scarlette Cervantes on Dec 06, 2021 FAQ



The jwt.sign () method takes a payload and the secret key defined in config.js as parameters. It creates a unique string of characters representing the payload. In our case, the payload is an object containing only the id of the user. Let’s write a piece of code to get the user id based on the token we got back from the register endpoint.
Furthermore,
I'm implementing a sign in system with the help of the JWT (JSON Web Token) scheme. Basically, after a user sign in / login, the server signs a JWT and passes it to the client. The client then returns the token with each request and the server verifies the token before sending back a response.
Also, JSON Web Token (JWT) is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. The tokens are signed either using a private secret or a public/private key pair using RSA or ECDSA.
Moreover,
A token automatically stores this value in the iat property. Every time you check the token, you can compare its iat value with the server-side user property. To invalidate the token, just update the server-side value. If iat is older than this, you can reject the token.
Similarly,
JWT technology is so popular and widely used that Google uses it to let you authenticate to its APIs. The idea is simple: you get a secret token from the service when you set up the API: On the client side, you create the token (there are many libraries for this) using the secret token to sign it.