why decode jwt code example

Example 1: js jwt decode

import jwt_decode from "jwt-decode";
var token = "eyJ0eXAiO...";
var decoded = jwt_decode(token);
console.log(decoded);

/* prints: * { foo: "bar", *   exp: 1393286893, *   iat: 1393268893  } */

Example 2: decode csrf token online

{
  "alg": "CfDJ8OW5OI0CPGJBgSNlGwO0x4YF7qbYKVv7KOO-N0eFtDUzXOrL7F9Xd9W1otVi4ueJOkAmAhuoHFWNkqRaFD7zvAMHMSKncl6Vo5QXKmpvy6vqxOKxSURdIey8aZPRi3Nnhp2p9la-Al5xrVKz0lignRdcCHf3O7pF9zv_sNx_c_T7pUe3WsxaJEPX3t_9FO2Wjw"
}