How do I generate and verify JWTs in Go?

JSON Web Tokens (JWTs) are a compact, URL-safe means of representing claims to be transferred between two parties. In Go, you can easily generate and verify JWTs using the "github.com/dgrijalva/jwt-go" package. Below is an example demonstrating how to create and validate JWTs in Go.

The following code example shows how to generate and verify a JWT:


        package main

        import (
            "fmt"
            "time"
            "github.com/dgrijalva/jwt-go"
        )

        func main() {
            // Generate JWT
            token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
                "foo": "bar",
                "exp": time.Now().Add(time.Hour * 72).Unix(),
            })

            // Sign the token with a secret
            secret := []byte("your-256-bit-secret")
            tokenString, err := token.SignedString(secret)
            if err != nil {
                fmt.Println("Error signing token:", err)
                return
            }
            fmt.Println("Generated Token:", tokenString)

            // Verify JWT
            parsedToken, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
                // Ensure token method is valid
                if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
                    return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
                }
                return secret, nil
            })

            if err != nil {
                fmt.Println("Token is invalid:", err)
                return
            }

            if claims, ok := parsedToken.Claims.(jwt.MapClaims); ok && parsedToken.Valid {
                fmt.Println("Token is valid. Claims:")
                fmt.Println(claims)
            } else {
                fmt.Println("Token is invalid.")
            }
        }

Go JWT JSON Web Tokens Authentication Token Generation Token Verification

How do I generate and verify JWTs in Go?

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How do I generate and verify JWTs in Go?

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