Generate Insecure JWT tokens in JavaScript

generate-insecure-token.js

function base64urlencode(obj) {
  if (obj instanceof Buffer) {
    buf = obj
  } else if (typeof obj === 'string') {
    buf = Buffer.from(obj)
  } else {
    json = JSON.stringify(obj, null, 0)
    buf = Buffer.from(json)
  }
  return buf.toString('base64')
         .replace(/\+/g, '-')  // 62nd char of encoding
         .replace(/\//g, '_')  // 63rd char of encoding
         .replace(/=*$/,'')    // Remove padding
}

header = {
  "typ": "JWT",
  "alg": "none"
}

now = Math.floor(new Date().getTime() / 1000)
payload = {
  "sub": "1234567890",
  "name": "John Doe",
  "exp": now + 86400,
  "iat": now
}

jwt = base64urlencode(header) + '.' + base64urlencode(payload) + '.' + base64urlencode('')
console.log(jwt)