ServiceNow Authentication

servicenow.js

const fetch = require('node-fetch')
const querystring = require('querystring')

var data = querystring.stringify({
  "grant_type": "password",
  // client_id and client_secret are from the System OAuth -> Application Registrations screen on the ServiceNow portal 
  "client_id": "",
  "client_secret": "",
  // username and password are valid user credentials for a user in the ServiceNow instance
  "username": "",
  "password": ""
})

fetch('https://instance.service-now.com/oauth_token.do', { method: 'POST', body: data, headers: { 'Content-Type': 'application/x-www-form-urlencoded' } })
  .then(response => {
    if(response.ok)
      return response.json()
    throw new Error('Unable to obtain request token')
  })
  .then(auth => fetch('https://instance.service-now.com/api/now/table/alm_asset?sysparm_limit=10', { method: 'GET', headers: { 'Authorization': 'Bearer ' + auth.access_token } }))
  .then(response => {
    if(response.ok)
      return response.json()
    throw new Error('Unable to obtain asset data')
  })
  .then(assets => console.log(JSON.stringify(assets, null, 2)))