Jwt.NET

JSON Web Tokens implementation for .NET Core.

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Windows	Linux	OS X

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Installation

Jwt.NET is avaiable on NuGet.

Usage

Creating tokens

var payload = new Dictionary<string, object>()
{
    { "key1", 1 },
    { "key2", "the-value" }
};
var secret = "SOME_SECRET_KEY";
var token = Jwt.JsonWebToken.Encode(payload, secretKey, Jwt.JwtHashAlgorithm.HS256);

Output:

eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJrZXkxIjoxLCJrZXkyIjoidGhlLXZhbHVlIn0.z4nWl_itwSsz1SbxEZkxCmm9MMkIKanFvgGz_gsWIJo

Decoding and verifying tokens

var token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJrZXkxIjoxLCJrZXkyIjoidGhlLXZhbHVlIn0.z4nWl_itwSsz1SbxEZkxCmm9MMkIKanFvgGz_gsWIJo"
var secret = "SOME_SECRET_KEY";

try
{
    var data = JsonWebToken.Decode(token, secret);
}
catch (SignatureVerificationException)
{
    // Given token is either expired or hashed with an unsupported algorithm.
}

Output:

{"key1":1,"key2":"the-value"}

Typed objects

You can use the DecodeToObject method to deserialize the decoded payload:

var token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJrZXkxIjoxLCJrZXkyIjoidGhlLXZhbHVlIn0.z4nWl_itwSsz1SbxEZkxCmm9MMkIKanFvgGz_gsWIJo"
var secret = "SOME_SECRET_KEY";

var decoded = JsonWebToken.DecodeToObject<Dictionary<string, object>>(token, secret);

Advanced

If you need advanced settings when encoding data, you can use the JwtBuilder class to build a JwtData object. This allows you to pass in an already serialized payload or append extra headers for example.

var serializedPayload = JsonConvert.SerializeObject(payload);
var secret = "SOME_SECRET_KEY";

var jwtData = new JwtBuilder()
    .WithPayload(serializedPayload)
    .IsSerialized()
    .WithKey(secret)
    .WithAlgorithm(JwtHashAlgorithm.HS512)
    .WithHeader("exp", 60 * 60)
    .Build();

var token = JsonWebToken.Encode(jwtData);