img-2-ascii.js

var asciify = require('asciify-image')

var options = {
  fit: 'box',
  width: process.stdout.columns,
  height: process.stdout.rows
}

asciify('cabal.png', options)
  .then(function (asciified) {
    // Print asciified image to console
    console.log(asciified)
  })
  .catch(function (err) {
    // Print error to console
    console.error(err)
  })