Node.js
Node.js is an open-source, cross-platform, JavaScript runtime built on Chrome's V8 Javascript engine that allows developers to create all kinds of server-side tools and applications in JavaScript. Node.js was developed by Ryan Dahl in 2009.https://nodejs.org/en/
- Javascript everywhere
- Great performance
- Asynchronous and event driven
- Single threaded
- Node package manager (npm) provides access to thousands of reusable packages.
- Portable
Express
Express is an un-opinionated, minimalist web framework for Node.jshttps://expressjs.com/
Setting up the Node environment
- Install Node $ curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
$ sudo apt-get install -y nodejs
$ node -v
- Install express generator The express application generator tool generates an Express application skeleton.
$ npm install express-generator -g
(-g flag installs the tool globally)
- Create skeleton project $ express --ejs --git hellonode
$ cd hellonode
$ npm install
$ DEBUG=hellonode:* npm start
then go to browser and enter http://localhost:3000/
- Enable server restart on file changes $ npm install --save-dev nodemon
then update the scripts section as below,
"scripts": {
"start": "node ./bin/www",
"devstart": "nodemon ./bin/www"
},
$ npm run devstart
- Directory structure Let's have a look at the generated files.
>> package.json
defines the application dependencies and other information
express: express framework
body-parser: parses the body portion of an incoming HTTP request and makes it easier to extract different parts of the contained information.
cookie-parser: uses to parse the cookie header.
morgan: HTTP request logger
ejs: view template engine
nodemon: enable server restart
>> www file
application entry point
>> app.js
sets up the application with various settings and middlewares.
>> routes
routers
>> views
view templates
Congratulations!!! you just created your first website which runs using Node!!!
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