Node js is said to be an open source. It is the cross-platform JavaScript runtime to developing different types of applications and tools. Thus the best node js course js is not a JavaScript framework with its many of the core modules which are mainly written in the JavaScript and even the developers to writing a new module. It is also primarily used to develop the input and output web applications like single page applications, video streaming sites with other web applications.

1. Best Node Js Course
B E S T O N L I N E C O U R S E S C O U P O N . C O

2. Table of
contents
About 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

3. 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.

4. 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.

5. 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

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.

16. 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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