tesseract.js/examples/node/basic.js

// replace this with require('tesseract.js')
var Tesseract = require('../../'),
    image = require('path').resolve(__dirname, 'cosmic.png');

Tesseract.recognize(image)
    .then(data => {
        console.log('then\n', data.text)
    })
    .catch(err => {
      console.log('catch\n', err);
    })
    .finally(e => {
      console.log('finally\n');
      process.exit();
    });