tweet.js

var Twitter = require('twitter')

//create your application from apps.twitter.com and generate the following keys. They will be something like this:
var client = new Twitter({
  consumer_key: 'ROMG2EYTR3ysrZxMDlzz35riF',
  consumer_secret: 'Blau4wgGQ06hM2oVvnCACMyLbMS73V5F9Bs44YchZvAvFc1ixq',
  access_token_key: '1530705451-jqAavRnuLXQ50vmbFeCe6TZyPTD1gALw7x7QD4N',
  access_token_secret: '8zJFNhoYyq9AfDTiDgh50omx3XzK6L25oJBet2ZrKtGqb'
})


// Load your image
var data = require('fs').readFileSync('./temp-img.jpg')

// Make post request on media endpoint. Pass file data as media parameter
client.post('media/upload', {
  media: data
}, function(error, media, response) {

  if (!error) {

    // If successful, a media object will be returned.
    console.log(media)

    // Lets tweet it
    var status = {
      status: 'I am a tweet',
      media_ids: media.media_id_string // Pass the media id string
    }

    client.post('statuses/update', status, function(error, tweet, response) {
      if (!error) {
        console.log(tweet)
      }
    })

  }
})