在节点中解码 Jwt 令牌 - 没有库

Question

I have a following code to decode the Jwt token in Javascript (ref: How to decode jwt token in javascript )

 const token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'; function parseJwt(token) { var base64Url = token.split('.')[1]; var base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/'); console.log(JSON.parse((atob(base64)))) }; parseJwt(token);

I am getting the payload which I needed from above code But I am implementing it in node where we dont have "atob" function to decode the base64 encoded string

Seems we need to use Buffer in node. Did my research and came up with below solution which didn't work.

 const token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'; function parseJwt(token) { const base64Url = token.split('.')[1]; const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/'); const buff = new Buffer(base64, 'base64'); const payloadinit = buff.toString('ascii'); const payload = JSON.parse(payloadinit); console.log(payload) }; parseJwt(token);

Please let me know if there is any better approach - No libraries(Jwt, or decode-Jwt)

Answer 1

Actually I have tried it in independent environment and above code works like charm for getting Jwt token pay load

 const token = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c' const base64Url = token.split('.')[1]; const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/'); const buff = new Buffer(base64, 'base64'); const payloadinit = buff.toString('ascii'); const payload = JSON.parse(payloadinit); console.log(payload);

https://repl.it/@Punith/RuralSeveralAdaware

Answer 2

const DecodeJWT= (token) => {
  try {
    return JSON.parse(atob(token.split('.')[1]));
  } catch (e) {
    return null;
  }
};

simple & easy way

Answer 3

您可以检查一下以获得atob功能。