How do I generate a JSON Web Token (JWT) with `jsonwebtoken`?

I've been reading about JWTs and how they can be used for authentication and authorization. I know `jsonwebtoken` is a popular library for generating and verifying JWTs, but I'm not sure how to use it. Can someone provide step by step instructions on how to generate a JWT with `jsonwebtoken` and explanations of each step? Thanks!

To generate a JWT with `jsonwebtoken`, follow these steps: 1. Create a payload object containing the necessary information (e.g. user ID). 2. Provide a secret key for signing the JWT. 3. Use the `sign()` method to generate a signed JWT from the payload and secret key. 4. Return the JWT as a string.

I recommend using a library such as `dotenv` to securely store your secret key as an environment variable, rather than hardcoding it in your code. This will prevent your secret key from being exposed in your code repository.

To verify a JWT, use the `verify()` method and provide the JWT and secret key. This will return the decoded payload if the signature is valid. You can then extract the necessary information from the payload for authentication and authorization purposes.