Cooxkie Cooxkie - 3 months ago 297
C# Question

How to decode JWT Token?

I don't understand how this library works. Could you help me please ?

Here is my simple code :

public void TestJwtSecurityTokenHandler()
{
var stream =
"eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJJU1MiLCJzY29wZSI6Imh0dHBzOi8vbGFyaW0uZG5zY2UuZG91YW5lL2NpZWxzZXJ2aWNlL3dzIiwiYXVkIjoiaHR0cHM6Ly9kb3VhbmUuZmluYW5jZXMuZ291di5mci9vYXV0aDIvdjEiLCJpYXQiOiJcL0RhdGUoMTQ2ODM2MjU5Mzc4NClcLyJ9";
var handler = new JwtSecurityTokenHandler();

var jsonToken = handler.ReadToken(stream);
}


This is error :


The string needs to be in compact JSON format, which is of the form: Base64UrlEncodedHeader.Base64UrlEndcodedPayload.OPTIONAL,Base64UrlEncodedSignature'.


If you copy stream in jwt.io website, it works fine :)

Thanks in advance for your help !

Answer

I found solution, I just missed to Cast result as follow :

var tokenS = handler.ReadToken(tokenJwtReponse.access_token) as JwtSecurityToken;

After I can get Claims like :

 var jti = tokenS.Claims.First(claim => claim.Type == "jti").Value;
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