How do I handle errors in JWT with Go?

How do I handle errors when using JWT in my Go application?

In Go, you can handle JWT errors by checking the error returned from functions like Parse or Verify. Always log the error for debugging.

What specific errors should I be looking for?

Common errors include token expiration, invalid signature, and malformed tokens. You can use jwt.ErrTokenExpired, jwt.ErrSignatureInvalid, and check for jwt.ErrMalformedToken.

Can you show me a code example?

Sure! Here's a simple example:

if claims, err := jwt.Parse(token, keyFunc); err != nil {
    if err == jwt.ErrTokenExpired {
        // Handle token expiration
    } else if err == jwt.ErrSignatureInvalid {
        // Handle invalid signature
    }
} else {
    // Use claims
}

What libraries do you recommend for JWT in Go?

I recommend using the github.com/dgrijalva/jwt-go library, which is widely used and well-documented.