JWT token decode without any library.

 

const token = localStorage.getItem("accessToken");

export default function getTokenDetails() {

  const base64Url = token.split(".")[1]; // Get the payload part of the JWT

  const base64 = base64Url.replace(/-/g, "+").replace(/_/g, "/");

  const jsonPayload = decodeURIComponent(

    atob(base64)

      .split("")

      .map((c) => "%" + ("00" + c.charCodeAt(0).toString(16)).slice(-2))

      .join("")

  );

  const decodedData = JSON.parse(jsonPayload);

  return decodedData;

}