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Install Express.js


Firstly, you have to install the express framework globally to create web application using Node terminal. Use the following command to install express framework globally.

  1. npm install -g express

Installing Express

Use the following command to install express:

  1. npm install express –save

The above command install express in node_module directory and create a directory named express inside the node_module. You should install some other important modules along with express. Following is the list:

  • body-parser: This is a node.js middleware for handling JSON, Raw, Text and URL encoded form data.
  • cookie-parser: It is used to parse Cookie header and populate req.cookies with an object keyed by the cookie names.
  • multer: This is a node.js middleware for handling multipart/form-data.
  1. npm install body-parser –save

npm install cookie-parser –save

npm install multer –save

Express.js App Example

Let’s take a simple Express app example which starts a server and listen on a local port. It only responds to homepage. For every other path, it will respond with a 404 Not Found error.

  1. File: express_example.js
  1. var express = require(‘express’);
  2. var app = express();
  3. app.get(‘/’, function (req, res) {
  4.    res.send(‘Welcome to Kreationnext‘);
  5. })
  6. var server = app.listen(8000, function () {
  7. var host = server.address().address
  8.   var port = server.address().port
  9.  console.log(“Example app listening at http://%s:%s”, host, port)
  10. })

install-expressjs6

Open http://127.0.0.1:8000/ in your browser to see the result.

install-expressjs7

 

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