Question 1

How to use custom claims with cristalhq/jwt in Go?

Accepted Answer

Define a struct that embeds jwt.RegisteredClaims or implements the Claims interface, then use the Builder to create tokens and json.Unmarshal to parse them. The library's example_test.go shows this with user-defined claims.

Question 2

cristalhq/jwt vs jwt-go which is better?

Accepted Answer

cristalhq/jwt offers a cleaner API and better performance with no dependencies, ideal for minimalistic projects. jwt-go has a larger community and more third-party integrations, making it better for teams needing ecosystem support.

Question 3

Is cristalhq/jwt thread-safe for concurrent Go applications?

Accepted Answer

Yes, the library is explicitly designed to be concurrent-safe, as stated in the Features, allowing safe use in high-traffic servers without additional synchronization.

Question 4

How to verify a JWT with an RSA public key using this library?

Accepted Answer

Use jwt.NewVerifierRS with the appropriate algorithm (e.g., RS256) and your RSA public key, then call Parse or Verify. The GUIDE.md provides details on algorithm-specific verifiers.

Question 5

What's the best way to handle token expiration with cristalhq/jwt?

Accepted Answer

Leverage the RegisteredClaims' IsValidAt method to check expiration, or implement custom validation logic in your claims struct. The library doesn't automate expiration handling, giving you control.

Question 6

Does cristalhq/jwt support JWT refresh tokens automatically?

Accepted Answer

No, it focuses on core JWT signing and verification; refresh tokens must be managed separately, often by issuing new tokens with updated claims in your application logic.

Question 7

How to integrate cristalhq/jwt with the Gin web framework?

Accepted Answer

Since it's dependency-free, create custom middleware: parse the token header using jwt.Parse with a verifier, then attach claims to Gin's context. You'll need to handle errors and validation manually.

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