Best Node Js Course

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Table of

contentsAbout Node js

Environment Setup

First application

REPL Terminal

Callback concept

Event loop and Emitter

Buffers and Streams

Global objects and File system

Web module

Express Framework

About Node js

Node.js said to be the real JavaScript based

platform and framework which is mainly built on

Google chrome’s JavaScript engine.

It utilized to expand the input and output

exhaustive web applications like web applications,

single page applications, and video streaming

sites. 

It is said to be an open source and it also

completely free which is used by the millions of

developer across the globe. 

Environment

Setup

The users don’t need to go over their set up to start

learning the node.js.

It is a simple user interface where the node.js has the

environment to learn online. 

Here you can quickly execute with many examples over

the online at the same time during your theory work. 

It gives you the confidence to check out the result with the

different number of options. 

First application

First of all, before creating the actual application using

the Node.js, we have to check out the components of

the node.js application. 

Three types of components

Import required modules

Read request and return response

Create server

REPL Terminal

REPL stands for the Read Eval Print Loop.

It mainly represents the computer environment setup like

UNIX or Linux and Windows console in an interactive mode.

Node or Node.js comes together with the REPL

Environment. It also mainly performs the tasks such as Read,

Print, Eval and Loop.

Main features of REPL of a node are very helpful in

experimenting to debug JavaScript codes and node.js. 

Callback Concept

The callback is said to a synchronous equivalent for the

function. 

The function of the callback is mainly called as the

completion of the task. 

the node makes great usage of the callback. 

Here all the APIs of the node are primarily written in a way

which supports the callbacks.

Therefore once the input and output file is complete, then

it will call the call back function during the period of

passing callback function with the content of the file as a

parameter. For the information, that is there is no blocking

or wait for the input and output file.   

Event  Loop 

Node.js uses events heavily and it is also one of the

reasons why Node.js is pretty fast compared to other

similar technologies. 

As soon as Node starts its server, it simply initiates its

variables, declares functions and then simply waits for

the event to occur.

In an 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  Emitter

Many objects in a Node emit events.

for example, a net.Server emits an event each time a

peer connects to it, an fs.readStream emits an event

when the file is opened.

All objects which emit events are the instances of

events.EventEmitter.

Buffers

Buffer is said to be the pure JavaScript which is a Unicode-

friendly, and it is not for binary data. 

Buffer class is a global class that can be accessed in an

application without importing the buffer module.

Node provides Buffer class which provides instances to

store raw data similar to an array of integers but

corresponds to a raw memory allocation outside the V8

heap.

Streams

Streams are objects that let you read data from a source or

write data to a destination in continuous fashion. 

there are four types of streams

Readable − Stream which is used for read operation.

Writable − Stream which is used for write operation.

Duplex − Stream which can be used for both read and

write operation.

Transform − A type of duplex stream where the output is

computed based on input.

Global

objects 

 It is said to be global in nature, and that is

mainly available in all the modules.

Thus the user does not need the objects to

include in any application instead of using

them directly.  

The objects are functions, modules, strings. 

File system

File system is said to be the node which mainly

implements the file input and output using the

wrappers around POSIX functions. 

Thus the node file system module is imported

by using the syntax var fs = require (“fs”).

The objects are functions, modules, strings. 

Web module

The web server is the software application which is mainly

handling the HTTP requests that are sent by the HTTP client

web pages and web browsers to the clients. 

The servers are usually delivering the HTML documents with

scripts, sheets, style, and images. 

Therefore most of the support the server side scripts and

using the scripting languages or by redirecting the process

to the application server which mainly helps to receive the

data from the database.

Express

Framework

The express is said to be the flexible and minimal Node.js

web application framework. It provides the robust

number of features to improve the mobile applications

and to develop the web.

It also mainly facilitates the continuous development of

web applications. 

Features of Express

Framework

It allows rendering the HTML pages which is mostly

based on the passing arguments to templates.

It also defines the routing table that is used to carry out

the different movements which are based on URL and

HTTP method.

It is mainly allowed to set up the middleware’s which

helps to respond to HTTP requests.

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