var payload = new Dictionary<string, object>
{
 { "claim1", 0 },
 { "claim2", "claim2-value" }
};
var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";
 
IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
IJsonSerializer serializer = new JsonNetSerializer();
IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);
 
var token = encoder.Encode(payload, secret);
Console.WriteLine(token);

var token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJjbGFpbTEiOjAsImNsYWltMiI6ImNsYWltMi12YWx1ZSJ9.8pwBI_HtXqI3UgQHQ_rDRnSQRxFL1SR8fbQoS-5kM5s";
var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";
try
{
 IJsonSerializer serializer = new JsonNetSerializer();
 IDateTimeProvider provider = new UtcDateTimeProvider();
 IJwtValidator validator = new JwtValidator(serializer, provider);
 IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
 IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder);
 
 var json = decoder.Decode(token, secret, verify: true);
 Console.WriteLine(json);
}
catch (TokenExpiredException)
{
 Console.WriteLine("Token has expired");
}
catch (SignatureVerificationException)
{
 Console.WriteLine("Token has invalid signature");
}

IDateTimeProvider provider = new UtcDateTimeProvider();
var now = provider.GetNow();
 
var unixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc); // or use JwtValidator.UnixEpoch
var secondsSinceEpoch = Math.Round((now - unixEpoch).TotalSeconds);
 
var payload = new Dictionary<string, object>
{
 { "exp", secondsSinceEpoch }
};
var secret = "GQDstcKsx0NHjPOuXOYg5MbeJ1XT0uFiwDVvVBrk";
var token = encoder.Encode(payload, secret);
 
var json = decoder.Decode(token, secret); // TokenExpiredException

public class CustomJsonSerializer : IJsonSerializer
{
 public string Serialize(object obj)
 {
 // Implement using favorite JSON Serializer
 }
 
 public T Deserialize<T>(string json)
 {
 // Implement using favorite JSON Serializer
 }
}

IJwtAlgorithm algorithm = new HMACSHA256Algorithm();
IJsonSerializer serializer = new CustomJsonSerializer();
IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
IJwtEncoder encoder = new JwtEncoder(algorithm, serializer, urlEncoder);