You can create a redirect using the Response.redirect()method: res.redirect('/go-there')Ī 301 redirect is made in this way: res.redirect(301, '/go-there')

There is a shortcut for the Content-Type header however: res.type('.html') // => 'text/html' res.type('html') // => 'text/html' res.type('json') // => 'application/json' res.type('application/json') // => 'application/json' res.type('png') // => image/png: Redirects You can change any HTTP header value using t(): res.set('Content-Type', 'text/html') There is a method for every HTTP verb: get(), post(), put(), delete(), patch(): app.get('/', (req, res) => ) Change any HTTP header value of a response Once we have the application object, we tell it to listen for GET requests on the / path, using the get() method. We instantiate an application by calling its app() method. Those 4 lines of code do a lot behind the scenes.įirst, we import the express package to the express value. Learn the basics of Express by understanding the Hello World code You can open the browser to port 3000 on localhost and you should see the Hello World! message. Save this to an index.js file in your project root folder, and start the server using node index.js Here is some code: const express = require('express') const app = express() app.get('/', (req, res) => res.send('Hello World!')) app.listen(3000, () => console.log('Server ready')) We’re ready to create our first Express Web Server. Just run npm init or yarn init if you're starting a new project from scratch. You can install Express into any project with npm: npm install express -saveīoth commands will also work in an empty directory, to start up your project from scratch, although npm does not create a package.json file at all, and Yarn creates a basic one. It’s Open Source, free, easy to extend, very performant, and has lots and lots of pre-built packages you can just drop in and use, to perform all kind of things. Node.js is an amazing tool for building networking services and applications.Įxpress builds on top of its features to provide easy to use functionality that satisfy the needs of the Web Server use case. How to create a self-signed HTTPS certificate for Node.js to test apps locally.How to retrieve the POST query string parameters.How to retrieve the GET query string parameters.

Learn the basics of Express by understanding the Hello World code.You can get a PDF, ePub and Mobi version of this page for an easier reference, or to read it on your Kindle or tablet.

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