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Build your First Web Server in ExpressJS

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by Abdul Rawoof A R dot icon Updated: Jan 25, 2024

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A node js web application framework that provides broad features for building web and mobile applications is Express. It is mainly used to build a single page.


It is a layer built on the top of the Node js that helps manage servers and routes in it.


Express is a back-end web application framework for building RESTful APIs with Node. js and released as free and open-source software under the MIT License. All HTTP request methods such as get, post, and so on are supported by Express and there is a special routing method app. all() which is used to load middleware functions at a path for all HTTP request methods.

Some popular companies reportedly use ExpressJS:

  • Twitter.
  • Stack.
  • kevin.
  • Client Platform.


Here is an example of how to build your first web server in ExpressJS:

Fig: Preview of the output that you will get on running this code from your IDE.

Code

Node (Express) doesn't start

JavaScriptdotLines of Code : 13dotLicense : Strong Copyleft (CC BY-SA 4.0)

const express = require('express')
const app = express()
const port = 8080

app.get('/', (req, res) => {
    let ip = req.ip
    console.log(ip);

    res.send('Hello World')
})

app.listen(port, ()=>console.log(`Server started on port ${port}`))

Instructions

Follow the steps carefully to get the output easily.

  1. Install Visual Studio Code on your computer.
  2. Open a new folder.
  3. Install - npm init --yes(to install json package file).
  4. Install - npm install --save express.
  5. Create a new JS file(eg: express.js).
  6. Copy the snippet using the 'copy' and paste it into that JS file.
  7. Save the file and open a new terminal, use the 'node filename(express.js)' command to get the output.


Note: I have used port address 3000 instead 8080 because port address 8080 is already running on my computer.

I hope you found this helpful.

I found this code snippet by searching for 'node express start' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created and tested in Visual Studio Code 1.74.1.
  2. ExpressJS version - 1.0.0.


Using this solution, we are able to build our first web server in ExpressJS with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to build our first web server in ExpressJS.

FAQ

1. What is Express.js, and why should I use it?

Express.js is a web application framework for Node.js. It's designed to make it easier to build web applications and APIs. It provides a set of features for routing, middleware requests, and responses.


2. How do I install Express.js?

It can install Express.js using npm (Node Package Manager) with the following command.

Example: npm install express


3. How do I use middleware in Express.js?

Middleware are functions that have access to the request, and response. The next middleware function in the application's request-response cycle.

Example: app.use((req, res, next) =>

{console.log ('Middleware executed!').

next);

});


4. Can I use template engines with Express.js?

Yes, it can use template engines like EJS, Handlebars, or Pug with Express.js to generate HTML.


5. What is the basic structure of an Express.js application?

Express applications typically have a set of routes, middleware functions, and configuration settings. A basic structure involves creating an instance of Express and defining a route server.


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