nodejs drive api v3 fetch children files from folder

drive-v3-fetch-children.js

const GoogleAuth = require('google-auth-library')
const OAuth2Client = GoogleAuth.OAuth2Client
const google = require('googleapis')

const clientId = '<YOUR_CLIENT_ID>'
const clientSecret = '<YOUR_CLIENT_SECRET>'
const redirectUri = '<Your URI Callback>'

const oauth2Client = new OAuth2Client(clientId, clientSecret, redirectUri)
// your oauth method, see documentation

const drive = google.drive({ version: 'v3', auth: oauth2Client })
/**
From now on, if you want to get the list of children, you must use a query string, in the form of
"'IDofYourFolder in' parents" where "in parents" indicates that Drive should look into IDofYouFolder
**/
drive.files.list({
  q: `'${googleFolderId}' in parents`
}, (err, data) => {
   if (err) throw err
   console.log('your files', data)
})

@Calvin087 it's named Promises, so you can look here and there for some explanations and examples. If you need some links to learn node.js, go to my own list on github you may find some interesting information.