How to Decode JWT Tokens Using JwtSecurityTokenHandler?

Decoding JWT Tokens with JwtSecurityTokenHandler

Decoding JWT (JSON Web Tokens) enables you to validate and extract information from these tokens. To decode JWT tokens using the JwtSecurityTokenHandler, you can follow these steps:

In your code, you have encountered an error while trying to decode a JWT token. The issue stems from the fact that the provided stream is not in the correct format for JwtSecurityTokenHandler.

To resolve this issue, you need to cast the result of handler.ReadToken as shown below:

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

Alternatively, you can use the JwtSecurityTokenHandler.ReadJwtToken method to decode the token without explicitly casting the result:

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

Once you have decoded the token, you can access the claims. For instance, to get the "jti" claim, you can use the following code:

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

By following these steps, you can successfully decode JWT tokens using the JwtSecurityTokenHandler.

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