Uploading a file to Trello API with Node.js

upload.js

'use strict'

const fs = require('fs')
const path = require('path')
const Trello = require('node-trello')

const trelloAuth = JSON.parse(fs.readFileSync('trello-credentials.json', 'utf8'))
const t = new Trello(trelloAuth.key, trelloAuth.token)

t.post(`/1/cards/${card.id}/attachments`, {
  attachment: fs.createReadStream(path.resolve(__dirname, 'downloads/', file))
}, function (err, attachments) {
  if (err) {
    console.log(err)
  }
})