Express

Express

    💥Express is a minimal and flexible Node.js web application framework that provides a robust set of features to develop web and mobile applications. It facilitates the rapid development of Node based Web applications.

     💥Following are some of the core features of Express framework −

• Allows to set up middle wares to respond to HTTP Requests.
• Defines a routing table which is used to perform different actions based on HTTP Method and URL.
• Allows to dynamically render HTML Pages based on passing arguments to templates.
  
  💥Install the Express framework globally using NPM so that it can be used to create a web application using node terminal.
         npm install express --save 
  
  💥we should install the following important modules along with express 
  
  
• body-parser − This is a node.js middleware for handling JSON, Raw, Text and URL encoded form data.
          npm install body-parser --save
  
  
• cookie-parser − Parse Cookie header and populate req.cookies with an object keyed by the cookie names.
         npm install cookie-parser --save
  
  
• multer − This is a node.js middleware for handling multipart/form-data.
         npm install multer --save

     💥Request & Response

              Express application uses a callback function whose parameters are request and response objects.

          app.get('/',function()
                 {

                  })

•  Request Object − The request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers.
  
• Response Object − The response object represents the HTTP response that an Express app sends when it gets an HTTP request.