How to Properly Decode JWT Tokens Using JwtSecurityTokenHandler?

Decoding JWT Tokens with JwtSecurityTokenHandler

When working with JWTs, it's crucial to be able to decode them for authentication and authorization purposes. However, some developers may encounter errors while using the JwtSecurityTokenHandler class.

Consider the following code:

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

    var jsonToken = handler.ReadToken(stream);
}

This code may throw an error stating that the string does not meet the required compact JSON format. The solution is to cast the result of ReadToken to a JwtSecurityToken object.

var stream ="eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJJU1MiLCJzY29wZSI6Imh0dHBzOi8vbGFyaW0uZG5zY2UuZG91YW5lL2NpZWxzZXJ2aWNlL3dzIiwiYXVkIjoiaHR0cHM6Ly9kb3VhbmUuZmluYW5jZXMuZ291di5mci9vYXV0aDIvdjEiLCJpYXQiOiJcL0RhdGUoMTQ2ODM2MjU5Mzc4NClcLyJ9";
var handler = new JwtSecurityTokenHandler();
var jsonToken = handler.ReadToken(stream);
var tokenS = jsonToken as JwtSecurityToken;

Alternatively, the ReadJwtToken method can be used.

var stream ="eyJhbGciOiJSUzI1NiJ9.eyJpc3MiOiJJU1MiLCJzY29wZSI6Imh0dHBzOi8vbGFyaW0uZG5zY2UuZG91YW5lL2NpZWxzZXJ2aWNlL3dzIiwiYXVkIjoiaHR0cHM6Ly9kb3VhbmUuZmluYW5jZXMuZ291di5mci9vYXV0aDIvdjEiLCJpYXQiOiJcL0RhdGUoMTQ2ODM2MjU5Mzc4NClcLyJ9";
var handler = new JwtSecurityTokenHandler();
var jwtSecurityToken = handler.ReadJwtToken(stream);

These modifications will cast the token to the correct type, allowing you to access their claims and validate them for authorization purposes.

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