Best Javascript framework?

Node.js is build upon Chrome Javascript runtime and is widely used by eBay, LinkedIn, Google etc.
See what other said about the node.js:


Uber
Node has allowed us to build a global, real-time logistics system without having to think twice about locking or concurrency issues.
Cloud9 IDE
Node.js allows us to build our real-time cloud IDE with a single language front to back. It makes life easier for both us and our users to write, run, and debug code, anywhere, anytime.
LinkedIn
On the server side, our entire mobile software stack is completely built in Node. One reason was scale. The second is Node showed us huge performance gains.

Transloadit
Node.js allows us to execute our many independent background processes in a non-blocking way. This is essential to make file uploading and encoding the way we do it a great user experience.

Simple webserver using node.js:

This simple web server written in Node responds with "Hello World" for every request.

var http = require('http');

http.createServer(function (req, res) {

  res.writeHead(200, {'Content-Type': 'text/plain'});

  res.end('Hello World\n');

}).listen(1337, '127.0.0.1');

console.log('Server running at http://127.0.0.1:1337/');

Installing in Linux/Unix without sudo permission:

$ git clone https://github.com/joyent/node.git

$ cd node

$ mkdir ~/opt

$ export PREFIX=~/opt; ./configure

$ make

$ make install

$ echo 'export PATH=~/opt/bin:${PATH}' >> ~/.bashrc