Encoding and Decoding JWT using JWT library(https://www.nuget.org/packages/JWT/)

JWTUtility.cs

using System;
using System.Collections.Generic;
using System.Linq;
using JWT;

namespace MyJWTUtility
{
    public static class JWTUtility
    {
        /// <summary>
        /// Generate Token(Or encode payload) Using HS256 Algorithm
        /// </summary>
        /// <param name="payload"></param>
        /// <returns></returns>
        public static string Encode(object payload)
        {
            string secretKey = "somethingvERYdifficultSecretKey1234";
            return JWT.JsonWebToken.Encode(payload, secretKey, JWT.JwtHashAlgorithm.HS256);
        }

        /// <summary>
        /// Decode token(which was encoded with HS256 algorithm)
        /// </summary>
        /// <param name="token"></param>
        /// <returns></returns>
        public static string DecodeToken(string token)
        {
            string secretKey = "somethingvERYdifficultSecretKey1234";
            return JWT.JsonWebToken.Decode(token, secretKey);
        }
    }
    
    public class MyJWT()
    {
        public string Field1 { get; set; }
        public string Field2 { get; set; }
        public double exp { get; set; }
    }
    
    public class TestClass()
    {
        public static string GenerateJWT()
        {
            MyJWT myJWTObject=new MyJWT();
            var unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            var expiryTime = Math.Round((DateTime.UtcNow.AddMinutes(5) - unixEpoch).TotalSeconds);//Set Expiry time accordingly
            myJWTObject.Field1 = "SomeRandomValue";
            myJWTObject.Field2 = "AgainSomeRandomValue";
            myJWTObject.exp = expiryTime;
            //Generated JWT with 5 minutes expiry time
            return JWTUtility.GetToken(myJWTObject);
        }
    }
}