tesseract.js/examples/node/detect.js

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

Tesseract.detect(image)
	.progress(function(info){
		console.log(info);
	})
	.then(function(data){
		console.log('done', data);
		process.exit();
	})