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What is Express.js? How Does it Streamline Web Application Development?

Last updated on: 
February 9, 2024
Ashwin Ramachandran
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About The Author!
Ashwin Ramachandran
Ashwin Ramachandran
Head of engineering at Interview Kickstart. Playing in the field of technology with the tools of Java for more than a decade. A mind full of innovative ideas and curiosity for exploring data.

Express.js stands out as the go-to framework for Node.js. Launched by its first contributor, TJ Holowaychuk, on January 3, 2010, it holds the title of the oldest and most mature framework. Beginners often find comfort in Express.js due to its unopinionated nature, offering a development experience closer to native Node applications.

Here’s what we’ll cover in this article: 

  • What is Express.js?
  • What are the Core Features of ExpressJS?
  • What are the Major Benefits of Using ExpressJS?
  • What are the Various Use Cases for Express?
  • How to Get Started with Express?
  • How Does Express.js Streamline Web Application Development?
  • Get Ready to Nail Your Tech Interview
  • FAQs about Express.js

What is Express.js?


Express.js is a minimal framework that simplifies and enhances Node web servers. It adds utilities to Node HTTP objects, making dynamic HTTP object rendering easier. It's a lightweight yet powerful tool, improving efficiency in web development. 

What are the Core Features of ExpressJS?

ExpressJS has several core features that make it a versatile and efficient framework:

Routing: ExpressJS excels in its fast routing system, facilitating easy management of diverse HTTP request endpoints within the application.

Middleware: Emphasizing a middleware-centric architecture, ExpressJS enables developers with functions that handle tasks like logging, authentication, and error management, promoting code modularity.

Templating Engines: Integration with such templating engines as Pug, EJS, and Handlebars allows you to generate HTML pages dynamically.

Error Handling: Gracious error management is enabled by the presence of built-in mechanisms for erroneous handling and a customized error middleware that adjusts users' experiences as well as increases application stability.

Static File Serving: One of the features provided by ExpressJS is simplifying serving static files such as images and CSS in order to make it easier for one-page application development.

RESTful API Development: Versatility shows as ExpressJS proves an excellent choice for building RESTful APIs. Supporting HTTP methods and data formats like JSON and XML, it facilitates efficient API design.

What are the Major Benefits of Using ExpressJS?

ExpressJS offers compelling advantages, making it a preferred choice for developers:

Speed and Performance: Built on Node.js, ExpressJS inherits exclusive performance capabilities, ensuring swift and efficient request handling. Its lightweight design makes it ideal for high-traffic applications, ensuring responsiveness.

Large Community and Ecosystem: With a vibrant and active developer community, ExpressJS benefits from continuous growth. A large ecosystem implies the availability of a variety of third-party modules, plugins, and middleware, providing more possibilities and additional support for the framework.

Flexibility and Scalability: Due to its minimalistic and unopinionated nature, ExpressJS allows developers to develop applications as per their desires. This flexibility allows scalability to work with different types of projects having unique demands.

Easy to Learn: ExpressJS's simplicity makes it accessible, particularly for developers familiar with JavaScript and Node.js. Its simple design accelerates the learning curve, allowing quick adoption and proficiency.

What are the Various Use Cases for Express?

Express proves versatile in various web development scenarios:

Building RESTful APIs: Express's routing and middleware capabilities make it an excellent choice for developing RESTful APIs and serving data to web and mobile applications efficiently.

Single-Page Applications (SPAs): Express is able to act as a backend for SPAs, where it handles data issues such as authentication and authorization in compliance with the structure of modern web applications.

Real-time Applications: Express, along with technologies such as WebSockets or SSE, is an excellent platform to introduce real-time applications like chat apps, live boards, and online gaming platforms.

Microservices: Due to its lightweight nature, Express helps develop microservices while offering independent and deployable orchestration within any broader architectural model.

Content Management Systems (CMS): Developers can use Express to design custom content management systems or enhance existing ones with custom features, providing flexibility in managing content.

Proxy Servers: Express serves as an efficient proxy server, routing requests to different backend services based on custom logic or configuration, enhancing flexibility in managing requests.

How to Get Started with Express?

Getting started with Express is quite simple. Follow these steps:

Node.js Installation: Make sure Node.js is installed on your computer. You can also get it from the official Node.js site.

Express Installation: Create a new Node.js project folder, navigate to it in your terminal, and run these commands to initialize your project and install Express:

npm init -y
npm install express --save

Creating an Express Application: In your project folder, create an app.js or server.js file. Set up your Express application with a basic example:

const express = require('express');
const app = express();
const port = 3000;

app.get('/', (req, res) => {
  res.send('Hello, Express!');

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

Running Your Express Application: Start your Express application with the command:

  node app.js

Your application will be accessible at http: //localhost:3000.

Explore Express: With your Express application running, check into the official Express documentation to discover more about features, middleware, and advanced capabilities.

How Does Express.js Streamline Web Application Development?

Rapid Prototyping:

Express.js is known for its minimalistic and unopinionated nature, allowing developers to set up and prototype applications quickly. The framework's simplicity accelerates the development process, making it an excellent choice for building prototypes and MVPs (Minimum Viable Products).


Express.js is a lightweight and modular framework that enables developers to pick out just the elements needed that they would include in their application. This scalability makes it suitable for both small projects and large, enterprise-level applications. Developers can easily scale their applications by adding necessary middleware, routers, and components as their project grows.


The extensibility of Express.js is high due to the rich middleware and plugin ecosystem it has created for itself. Developers can either use available modules or build custom middleware for functionality on their applications. This extensibility promotes code reuse and collaboration within the developer community.

Community and Documentation:

Express.js has a large and active community, which means ample resources, tutorials, and third-party modules are available. The comprehensive documentation further aids developers in understanding and effectively using the framework. This wide range of resources makes it easier for developers to work through these challenges and maintain awareness about the current best practices.


Express.js is a platform that was developed based on Node, which uses its high-powered performance framework to run it successfully. Node.js asynchronous, event-driven architecture along with Express. js's light design produces applications that are capable of handling more connections concurrently than the ones produced by other technologies (for instance. NET). 

Get Ready to Nail Your Next Tech Interview

As developers explore the fast-expanding virtual world, Express.js serves as an exclusive framework to eliminate complications and promote infinite innovations in web development.

If you're aiming for roles like a software developer, engineer, tech lead or eyeing management positions in top companies, Interview Kickstart (IK) has customized Technical Interview Preparation Courses to prepare you for technical interviews! 

For guidance and a head start, join our FREE webinar. As pioneers in technical interview preparation, we've successfully trained thousands of software engineers, helping them excel in challenging coding interviews and secure positions at renowned companies like Google, Facebook, Apple, Netflix, Amazon, and beyond!

FAQs about Express.js

1. Why is Express used in the MERN stack?

Express acts as the backend in MERN (MongoDB, Express, React, Node.js). It manages server-side tasks, connecting with MongoDB and creating a complete development stack.

2. Is ExpressJS a REST API?

Express.js is a web app framework but is often used to build RESTful APIs. It's versatile and not limited to just APIs.

3. Why should you separate the Express app and server?

Separating them improves organization and scalability, making it easier to manage and extend your app as it grows.

4. Do we need ExpressJS with Next.js?

If using Next.js for server-side rendering, Express might not be necessary. But for extra server-side features, Express can complement Next.js.

5. What language is ExpressJS written in?

Express.js is written in JavaScript, the language used for Node.js.

6. Which is better, Django or Express?

Depends on language preference (Python for Django, JavaScript for Express) and project requirements.

7. Is ExpressJS easier than Django?

Ease depends on language familiarity. Both have good documentation, and the choice depends on the project's needs.

8. Why is Node.js better than Python?

It depends on the project's needs. Node.js is event-driven for scalability, while Python's simplicity suits various tasks.

Posted on 
February 7, 2024

Ashwin Ramachandran

Head of Engineering @ Interview Kickstart. Enjoys cutting through the noise and finding patterns.

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