How to decode JWT Token?

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I found the solution, I just forgot to Cast the result:

var stream = "[encoded jwt]";  
var handler = new JwtSecurityTokenHandler();
var jsonToken = handler.ReadToken(stream);
var tokenS = jsonToken as JwtSecurityToken;

Or, without the cast:

var token = "[encoded jwt]";  
var handler = new JwtSecurityTokenHandler();
var jwtSecurityToken = handler.ReadJwtToken(token);

I can get Claims using:

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

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