Node.js

A callback function is a function which can be passed as an argument into another function. This callback function can then be invoked inside the outer function. Callback functions were introduced in JavaScript. Since Node.js built on V8 engine, it also support callback functions. In the above example, doComplete is a callback function. This program … Read more

Here we write a basic web application in Node.js that serves static text to the client’s HTTP requests. Added an event listener on the server variable that listens to the request events. The event listener takes a callback function with two arguments, request and response. If there is a request, node.js will raise a request … Read more

How Node.js process this program? flag variable declaration will be placed in call stack and it will be initialized to true. setTimeout() function call will be placed in call stack. Node.js start the timer and schedules a timer event for 1 second. The callback function will be placed in MessageQueue after 1 second. Node.js continues … Read more

In this post we will learn to read a text file synchronously with a blocking code and asynchronously by writing non-blocking code. Node.js provides methods to read a file both synchronously and asynchronously in it’s ‘fs’ module. Synchronously reading a file using blocking methods of Node.js: Asynchronously reading a file using non-blocking methods of Node.js:

Here we write a simple web server program in Node.js that serves static text to the client’s HTTP requests. The createServer method returns a http.Server object We are passing requestListener callback function as a parameter to createServer which automatically added to the ‘request’ event http.Server emits ‘request’ event when it receives a request The request … Read more