jwt

• Jwt.Net, a JWT (JSON Web Token) implementation for .NET
• Sponsor
• Avaliable NuGet packages
• Supported .NET versions:
• Jwt.NET
  • Creating (encoding) token
    • Or using the fluent builder API
  • Parsing (decoding) and verifying token
    • Or using the fluent builder API
    • Or using the fluent builder API
  • Validate token expiration
  • Parsing (decoding) token header
    • Or using the fluent builder API
  • Turning off parts of token validation
    • Or using the fluent builder API
  • Custom JSON serializer
  • Custom JSON serialization settings with the default JsonNetSerializer
• Jwt.Net ASP.NET Core
  • Register authentication handler to validate JWT
  • Custom factories to produce Identity or AuthenticationTicket
• License

Jwt.Net, a JWT (JSON Web Token) implementation for .NET

This library supports generating and decoding JSON Web Tokens.

Sponsor

	If you want to quickly implement a secure authentication to your JWT project, create an Auth0 account; it's Free!

Avaliable NuGet packages

1. Jwt.Net

2. Jwt.Net for Microsoft Dependency Injection container

3. Jwt.Net for ASP.NET Core

Supported .NET versions:

• .NET Framework 3.5
• .NET Framework 4.0 - 4.8
• .NET Standard 1.3, 2.0
• .NET 6.0

Jwt.NET

Creating (encoding) token

var payload = new Dictionary<string, object>
{
    { "claim1", 0 },
    { "claim2", "claim2-value" }
};

IJwtAlgorithm algorithm = new RS256Algorithm(certificate);
IJsonSerializer serializer = new JsonNetSerializer();
IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);
const string key = null; // not needed if algorithm is asymmetric

var token = encoder.Encode(payload, key);
Console.WriteLine(token);

Or using the fluent builder API

var token = JwtBuilder.Create()
                      .WithAlgorithm(new RS256Algorithm(certificate))
                      .AddClaim("exp", DateTimeOffset.UtcNow.AddHours(1).ToUnixTimeSeconds())
                      .AddClaim("claim1", 0)
                      .AddClaim("claim2", "claim2-value")
                      .Encode();
Console.WriteLine(token);

Parsing (decoding) and verifying token

try
{
    IJsonSerializer serializer = new JsonNetSerializer();
    IDateTimeProvider provider = new UtcDateTimeProvider();
    IJwtValidator validator = new JwtValidator(serializer, provider);
    IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
    IJwtAlgorithm algorithm = new RS256Algorithm(certificate);
    IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder, algorithm);
    
    var json = decoder.Decode(token);
    Console.WriteLine(json);
}
catch (TokenNotYetValidException)
{
    Console.WriteLine("Token is not valid yet");
}
catch (TokenExpiredException)
{
    Console.WriteLine("Token has expired");
}
catch (SignatureVerificationException)
{
    Console.WriteLine("Token has invalid signature");
}

Or using the fluent builder API

var json = JwtBuilder.Create()
                     .WithAlgorithm(new RS256Algorithm(certificate))
                     .MustVerifySignature()
                     .Decode(token);                    
Console.WriteLine(json);

The output would be:

{ "claim1": 0, "claim2": "claim2-value" }

You can also deserialize the JSON payload directly to a .NET type:

var payload = decoder.DecodeToObject<IDictionary<string, object>>(token, secret);

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