{"id":73304,"date":"2020-01-15T16:32:39","date_gmt":"2020-01-15T11:02:39","guid":{"rendered":"https:\/\/www.vskills.in\/certification\/tutorial\/?p=73304"},"modified":"2024-04-12T14:27:14","modified_gmt":"2024-04-12T08:57:14","slug":"hello-world-example-2","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/hello-world-example-2\/","title":{"rendered":"Hello world example"},"content":{"rendered":"\n

Go back to Tutorial<\/a><\/p>\n\n\n

Embedded below is essentially the simplest Express app you can create. It is a single file app \u2014 not what you\u2019d get if you use the Express generator, which creates the scaffolding for a full app with numerous JavaScript files, Jade templates, and sub-directories for various purposes.<\/p>\n

const express = require(‘express’)<\/p>\n

const app = express()<\/p>\n

const port = 3000<\/p>\n

app.get(‘\/’, (req, res) => res.send(‘Hello World!’))<\/p>\n

app.listen(port, () => console.log(`Example app listening on port ${port}!`))<\/p>\n

This app starts a server and listens on port 3000 for connections. The app responds with \u201cHello World!\u201d for requests to the root URL (\/) or route. For every other path, it will respond with a 404 Not Found.<\/p>\n

The example above is actually a working server: Go ahead and click on the URL shown. You\u2019ll get a response, with real-time logs on the page, and any changes you make will be reflected in real time.<\/p>\n

Running Locally<\/span><\/strong><\/p>\n

First create a directory named myapp, change to it and run npm init. Then install express as a dependency, as per the installation guide.<\/p>\n

In the myapp directory, create a file named app.js and copy in the code from the example above.<\/p>\n

The req (request) and res (response) are the exact same objects that Node provides, so you can invoke req.pipe(), req.on(‘data’, callback), and anything else you would do without Express involved.<\/p>\n

Run the app with the following command:<\/p>\n

$ node app.js<\/p>\n

Then, load http:\/\/localhost:3000\/ in a browser to see the output.<\/p>\n\n\n

Go back to Tutorial<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Go back to Tutorial Embedded below is essentially the simplest Express app you can create. It is a single file app \u2014 not what you\u2019d get if you use the Express generator, which creates the scaffolding for a full app with numerous JavaScript files, Jade templates, and sub-directories for various purposes. const express = require(‘express’)…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[8514],"tags":[8490],"class_list":["post-73304","page","type-page","status-publish","hentry","category-mean-stack","tag-hello-world-example"],"acf":[],"yoast_head":"\nHello world example - Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/tutorial\/hello-world-example-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hello world example - Tutorial\" \/>\n<meta property=\"og:description\" content=\"Go back to Tutorial Embedded below is essentially the simplest Express app you can create. 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