pure json react native friendly JWT

react-native-friendly-jwt.js

const base64 = require('base-64')
const base64url = (s) => base64.encode(s).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '')
const CryptoJS = require( 'crypto-js')
const hmacSHA256 = CryptoJS.HmacSHA256

var seed = {
  sub: "1234567890",
  name: "John Doe",
  admin: true
}

const payload = JSON.stringify(seed)

const hs256 = {"alg":"HS256",typ:"JWT"}
const header = JSON.stringify(hs256)

const signature = hmacSHA256([
  base64url(header),
  base64url(payload),
].join('.'), 'secret')

console.log(
  [
    base64url(header),
    base64url(payload),
    signature.toString(CryptoJS.enc.Base64).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '')
  ].join('.')
)