Mastering JavaScript

Server-Side JavaScript
Consider the following example of asynchronous code execution in Node.js:
var fs = require('fs');
console.log('1');
fs.readFile('./response.json', function (error, data) {
if(!error){
console.log(data);
});
console.log('2');
In this program, we read the response.json file from the disk. When the disk I/O is
finished, the callback is executed with parameters containing the argument's error, if
any error occurred, and data, which is the file data. What you will see in the console
is the output of console.log('1') and console.log('2') one immediately after
another:
Node.js does not need any additional server component as it creates its own server
process. A Node application is essentially a server running on a designated port. In
Node, the server and application are the same.
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