Node.js is an Event driven based platform. This means that everything that happens in Node is the reaction to an event.Event driven programming is a programming paradigm in which the flow of the program is determined by events such as user actions (mouse clicks, key presses), sensor outputs, or messages from other programs/threads .In any event-driven application, there is generally a main loop that listens for events, and then triggers a callback function when one of those events is detected. Event Loop is a single threaded and semi-infinite loop. The reason why this is called a semi-infinite loop is because...

The web module is the smallest deployable and usable unit of web resources. A web module contains web components and static web content files, such as images, which are called web resources. What is a web server and How it works? Web server is a software program that deals with HTTP (hypertext transfer protocol) requests sent by HTTP clients (web browser like Google, Internet Explorer, Mozilla Firefox) and render web pages in response to the clients. Web server usually returns HTML documents along with images, style sheets, and scripts. Most of the web server support server-side scripts and get data from the database and performs complex logic and then send...

Streams are nothing but the objects that allows you to read and write the data from source to destination. Just like strings and arrays, streams are the collection of data. Node js offers us various stream objects. For example in a node based  HTTP server, a request is a readable stream and response is a writable stream. http.createServer(function(req,res) { }); Topics Covered Type of Streams Streams Events Readable Streams Writable Streams Piping the Streams Chaining Streams Type of Streams in Node.js Readable: Readable stream is used to read a file from source. var fs = require('fs'); //Create a Readable Stream var readfile =...

These objects are global in nature and are available in all modules. There is no need to include these objects in our application, rather we can use them directly. These objects are modules, functions, strings, object etc. Topics Covered : Console Process Scheduling Timers setImmediate(callback[, ...args]) setInterval(callback, delay[, ...args]) setTimeout(callback, delay[, ...args]) Cancelling Timers clearImmediate(immediateObject) clearInterval(intervalObject) clearTimeout(timeoutObject) Dirname : __dirname Filename : __filename Exports Module Require Console The console provides a simple debugging console. Used to print information on stdout and stderr. It uses built-in methods for printing informational, warning and error messages. It exports two specific components : Console...

In node.js, why do we need File System Modules(fs)? the answer is simple whenever you need to deal with file operations like accessing the file from server, saving file to your server or into your local machine and many more operations are there, so to deal with these situations we have file system module known as 'fs' module which is by default package of node.js you do not need to install its package using 'npm'. In this tutorial, we are going to cover all the basic operations related to File system using 'fs' module of node.js. Topics covered File operations...

We use Node.js and Mongodb together when we need to use Node.js in Database Applications. Mongodb is a NoSQL database. Its a document based Database. The benefits of using NoSQL database instead of traditional database are- - A Relational database has a typical schema design that contains tables and the relations between them but in NoSQL database like Monogdb there is no concept of relationship. - It is a document oriented database in which one collection holds different documents. - It's Extremely faster than RDBMS. - In MongoDB data is written in BSON format which is a JSON like format....

// Installing package locally npm install --save package-name // Installing Package Globally npm install -g package-name List Of Important Packages npm install async --save npm install underscore --save npm install -g node-dev // This helps to restart the server automatically. npm install -g jshint // Check for js code and generate erro if any Learn More- Node Js Json Node Js Mongodb Create Collection Node Js Mongodb Delete From Database 

What is Git ? Git is a version control system. In simple terms it is a solution to make code management easier. With GIT we can revert back to any changes in any past time made to code easily and quickly. Using GIT and Amazon Code deploy any changes made to Git master will be automatically deployed to our production or testing server and made live automatically. Key Terms in GIT Repository - Repository means a directory where all the code files are present. In simple terms think of it as a simple directory on your computer where all your...

<!-- Get Complete Source Code from Pabbly.com --> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <form action="/" method="POST"> <label>Name: </label> <input type="text" name="dname" value="" /><br /> <label>Email: </label> <input type="text" name="demail" value="" /><br /> <label>Address: </label> <input type="text" name="daddress" value="" /><br /> <button>submit</button> </form> </body> </html> Node.js File // Node.js: HTTP SERVER Handling GET and POST Request // Show HTML Form at GET request. // At POST Request: Grab form data and display them. // Get Complete Source Code from Pabbly.com var http = require('http'); var fs = require('fs'); var...

// FileName: student.json [ { "name": "Pankaj Agarwal", "office" : "Magnet Brains Software Technology Pvt. Ltd", "project" : "pabbly.com" }, { "name": "Ramesh Chandra", "office" : "Magnet Brains", "project" : "woofresh.com" }, { "name": "Suk Sagar", "office" : "Magnet", "project" : "formget.com" }, { "name": "Rakesh Roy", "office" : "Magnet Brains Software Technology Pvt. Ltd", "project" : "pabbly.com" } ] sdfsdf // Reading JSON Files Using Node.js // Generating Right JSON from Routing Using Node.js // JSON Files: student.json // Get Complete Source Code from Pabbly.com var http = require('http'); var staffdata = require('./public/data/student.json'); var server = http.createServer(function(req, res){ if(req.url...