tesseract example

app.js

var express = require('express');
var fs = require('fs');
var Busboy = require('busboy');
var mime = require('mime');
var tesseract = require('node-tesseract');

var app = express();

app.post('/upload', function(req, res) {
	try {
		var busboy = new Busboy({
			headers: req.headers
		});
	} catch (err) {
		return res.status(400).json({
			message: 'Unable to parse incoming file.',
			error: err
		})
	}

	busboy.on('file', function(fieldname, filestream, filename, encoding, mimetype) {
		console.log('incoming file');

		var filepath = './files/' + _id + '.' + mime.extension(mimetype);

		var ws = fs.createWriteStream(filepath);

		ws.on('finish', function() {
			console.log('file written to disk');
			tesseract.process(filepath, function(err, text) {
				console.log('tesseract process finished');
				if (err) return callback(err);
				callback(null, file, text)
			})
		});

		filestream.pipe(ws);
	});

	busboy.on('error', function(err) {
		res.status(500).json({
			message: 'There was a problem parsing your file.',
			error: err
		})
	});
});

var server = app.listen(3000, function() {
	var host = server.address().address;
	var port = server.address().port;

	console.log('Example app listening at http://%s:%s', host, port);
});

package.json

{ 
  "name": "tesseract",
  "dependencies": {
    "busboy": "*",
    "express": "*",
    "mime": "*",
    "node-tesseract": "*"
  },
  "scripts": {
    "start": "node app"
  }
}