Apple oauth token generator

jwtGenerator.js

const jwt = require('jsonwebtoken')
const fs = require('fs')

const appleId = 'com.your.service.id.here'
const keyId =  'XXXXXXXXXX' // 10 chars, your generated apple key id
const teamId = 'ZZZZZZZZZZ'
const privateKey = fs.readFileSync('YOUR-PATH-HERE.p8')

const secret = jwt.sign(
  {
    iss: teamId,
    iat: Math.floor(Date.now() / 1000),
    exp: Math.floor(Date.now() / 1000) + ( 86400 * 180 ), // 6 months
    aud: 'https://appleid.apple.com',
    sub: appleId
  }, privateKey, {
    algorithm: 'ES256',
    keyid: keyId
  })

console.log(secret)