Node.js: Gzip compression?

Am I wrong in finding that Node.js does no gzip compression and there are no modules out there to perform gzip compression? How can anyone use a web server that has no compression? What am I missing here? Should I try to—gasp—port the algorithm to JavaScript for server-side use?

Solution 1:

Node v0.6.x has a stable zlib module in core now - there are some examples on how to use it server-side in the docs too.

An example (taken from the docs):

// server example
// Running a gzip operation on every request is quite expensive.
// It would be much more efficient to cache the compressed buffer.
var zlib = require('zlib');
var http = require('http');
var fs = require('fs');
http.createServer(function(request, response) {
  var raw = fs.createReadStream('index.html');
  var acceptEncoding = request.headers['accept-encoding'];
  if (!acceptEncoding) {
    acceptEncoding = '';
  }

  // Note: this is not a conformant accept-encoding parser.
  // See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3
  if (acceptEncoding.match(/\bdeflate\b/)) {
    response.writeHead(200, { 'content-encoding': 'deflate' });
    raw.pipe(zlib.createDeflate()).pipe(response);
  } else if (acceptEncoding.match(/\bgzip\b/)) {
    response.writeHead(200, { 'content-encoding': 'gzip' });
    raw.pipe(zlib.createGzip()).pipe(response);
  } else {
    response.writeHead(200, {});
    raw.pipe(response);
  }
}).listen(1337);

Solution 2:

If you're using Express, then you can use its compress method as part of the configuration:

var express = require('express');
var app = express.createServer();
app.use(express.compress());

And you can find more on compress here: http://expressjs.com/api.html#compress

And if you're not using Express... Why not, man?! :)

NOTE: (thanks to @ankitjaininfo) This middleware should be one of the first you "use" to ensure all responses are compressed. Ensure that this is above your routes and static handler (eg. how I have it above).

NOTE: (thanks to @ciro-costa) Since express 4.0, the express.compress middleware is deprecated. It was inherited from connect 3.0 and express no longer includes connect 3.0. Check Express Compression for getting the middleware.

Solution 3:

1- Install compression

npm install compression

2- Use it

var express     = require('express')
var compression = require('compression')

var app = express()
app.use(compression())

compression on Github

Solution 4:

Generally speaking, for a production web application, you will want to put your node.js app behind a lightweight reverse proxy such as nginx or lighttpd. Among the many benefits of this setup, you can configure the reverse proxy to do http compression or even tls compression, without having to change your application source code.