Hands-On RESTful Web Services with Go - Second Edition

Creating a JWT in Go

The jwt-go package has a function called NewWithClaims that takes two arguments:

• A signing method such as HMAC256, RSA, and so on
• A claims map

For example, it looks like the following code snippet:

token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
    "username": "admin",
    "iat":time.Now().Unix(),
})

jwt.SigningMethodHS256 is an encryption algorithm that is available within the package. The second argument is a map with claims such as private (here, username) and reserved (issued iat). Now, we can generate a tokenString using the SignedString function on a token, as follows:

tokenString, err := token.SignedString("my_secret_key")

This tokenString should then be sent back to the client as part of a successful ...