Single javascript file node/express/instagram authentication (oauth) and get user photos

index.js

const express = require('express')
const path = require('path')
const ig = require('instagram-node').instagram()
const cookieParser = require('cookie-parser')

// Set the config values below inline or from environment variables
const PORT = process.env.PORT || 8110
const IG_CLIENT_ID = process.env.IG_CLIENT_ID
const IG_CLIENT_SECRET = process.env.IG_CLIENT_SECRET

ig.use({
  client_id: IG_CLIENT_ID,
  client_secret: IG_CLIENT_SECRET
})

const igRedirecrUri = process.env.IG_REDIRECT_URI

const app = express()
app.use(express.static(path.join(__dirname, 'public')))
app.use(cookieParser())

app.get('/', (req, res) => {
  res.send('<a href="/instagram/authorize">Login with Instagram</a>');
})

app.get('/instagram/authorize', (req, res) => {
  res.redirect(ig.get_authorization_url(igRedirecrUri, {
    scope: ['public_content', 'likes']
  }))
})

app.get('/instagram/callback', (req, res) => {
  ig.authorize_user(req.query.code, igRedirecrUri, (err, result) => {
  if(err) return res.send(err)
    // ideally, store token in db and create a
    // browser session id to use the token from db
    // but for quick demo, we'll use cookie store
    // method below is not secure at all
    res.cookie('igAccessToken', result.access_token)
    res.redirect('/instagram/photos')
  })
})

app.get('/instagram/photos', (req, res) => {
  try {
    // use ig token from db (that is linked to the browser session id)
    // or for our demo version, get it from cookies
    const accessToken = req.cookies.igAccessToken

    ig.use({ access_token: accessToken })

    const userId = accessToken.split('.')[0] // ig user id, like: 1633560409
    ig.user_media_recent(userId, (err, result, pagination, remaining, limit) => {
      if(err) return res.render('error')
      // send photo array to a view or for our demo build html
      // (list of ig photos) and return to the browser
      let html = '';
      result.map((photo) => {
        html += '<a href="' + photo.link + '">' +
          '<img src="' + photo.images.low_resolution.url + '"/></a><br/>'
      })
      res.send(html);
    })
  }
  catch (e) {
    res.render('error')
  }
})

app.listen(PORT, () => console.log(`App listening on port ${PORT}!`))