Create Jwt Bearer Token (sample)

program.cs

using System;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using System.Text;
using Microsoft.IdentityModel.Tokens;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var tokenHandler = new JwtSecurityTokenHandler();
            var key = Encoding.ASCII.GetBytes("mysecret12345abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMN");
            var tokenDescriptor = new SecurityTokenDescriptor
            {
                Subject = new ClaimsIdentity(new Claim[]
                {
                                new Claim(ClaimTypes.Name, "myuserid")
                }),
                Expires = DateTime.UtcNow.AddDays(7),
                SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
            };
            var token = tokenHandler.CreateToken(tokenDescriptor);
            string tk = tokenHandler.WriteToken(token);
            Console.WriteLine(string.Format("Token: {0}", tk));
        }
    }
}