Try JWT with golang

token-jwt.go

package main

import (
	"fmt"
	"time"

	"github.com/dgrijalva/jwt-go"
)

const secret = "big-secret"

func main() {
	type DefaultClaims struct {
		jwt.StandardClaims
		UserID   uint   `json:"user_id"`
		RoleType string `json:"role_type"`
	}

	attrs := map[string]interface{}{
		"user_id":   31,
		"role_type": "BOSS",
		"exp":       time.Now().Unix(),
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims(attrs))
	sToken, err := token.SignedString([]byte(secret))
	check(err)

	fmt.Println("String Token:", sToken)

	t, err := jwt.ParseWithClaims(sToken, &DefaultClaims{}, func(token *jwt.Token) (interface{}, error) {
		return []byte(secret), nil
	})
	check(err)

	if claims, ok := t.Claims.(*DefaultClaims); ok {
		fmt.Printf("User ID: %v is %s, token valid until %v\n", claims.UserID, claims.RoleType, claims.StandardClaims.ExpiresAt)
	}
}

func check(e error) {
	if e != nil {
		fmt.Println("err >", e)
	}
}