Express JS Full Tutorial In Tamil

• Express JS is a open source web framework for Node.js.

• Express JS is a fast, robust and asynchronous in nature.

• We can design single-page or multi-page web applications

• Express JS support middleware to respond to HTTP Requests.

• Express JS allows routing concepts to perform different actions based on user action such as HTTP method and URL

• Express JS allows to use templates for dynamically render HTML Pages.

• We will learn all the following topics such as HTTP methods, routing, cookie management, scaffolding, file upload, template, session, url building, authentication, middleware, RESTful API etc.

Express JS Installation

• Install the express framework globally to create web application using Node JS terminal.

                                        npm install -g express

• This command install express in node module directory and create a directory named express inside the node module.

                                        npm install express --save

• This command install node.js middleware for handling JSON, Raw, Text and URL encoded form data

                                        npm install body-parser --save

• This command used to Parse Cookie header and populate req.cookies with an object keyed by the cookie names

                                        npm install cookie-parser --save

• This command install node.js middleware for handling multipart/form-data.

                                        npm install multer --save

GET

• The GET method should retrieve the data. It should send limited amount of data only and that data are visible in the url address.

POST

• The POST method send large amount of data and that data are not visible in the url address.

• The data enclosed in the request is accept by the server as a new object/entity of the resource

PUT

• The data enclosed in the request is accept by the server as a modification to existing object

DELETE

• This method requests the server to delete the specified resource.

Types of Request

req.app

req.body

req.params

req.path

req.query

req.route

req.cookie

req.secure

req.subdomains

req.baseurl

Types of Response

res.app

res.send

res.redirect

res.location

res.append

res.attachment

res.cookie

res.download

res.render

res.end