What is Express.js? What is the Purpose of Using it with Node.js?

If you are familiar with the name Node.js, the runtime environment for JavaScript, then eight out of ten times you might have heard of Express.js as well. Express.js is essentially a free, open-source framework for Node.js. It is this framework that makes developing web applications easy, effortless, and quick. What’s more? All that the developers need to know is JavaScript to build powerful websites or web applications.


What is Express.js?

Express.js is a lightweight framework for Node.js that helps in building server-side web applications in an organized form using MVC architecture.

Why is Express.js needed?

Without the Express.js framework, the developers will have to write complex code to build web applications, which is tedious and hectic. This is where Express.js can help web developers in building complex websites within a short duration.

Express.js offers efficiency, simplicity, scalability, and flexibility to programmers. The framework helps the developers in reusing the code already written. However, it is Node.js that is designed to be quick in executing the code with the help of the asynchronous or non-blocking Event loop to avoid all inefficiencies.

Express.js is the most popular, star-rated framework for Node.js, that helps the developers simply enjoy working with this duo for building web applications, websites, or mobile applications, quickly and efficiently.

Features of Express.js

In the worst-case scenario, Express.js will help you write 5x fewer lines of code as compared to any other API. The following are the features of Express.js:

Quicker backend programming:

Express.js is a framework, and hence dismisses the need for coding for the same functionality over and over again. The functions can be readily used and thus saving the coding effort, time, and increases productivity.

Organized Middleware:

Middleware is the part of the program that deals with establishing a connection with the database, client requests, etc. Express.js handles these responsibilities with the help of functions in a systematic, and organized manner.

Advanced Routing:

Routing corresponds to how the application responds to the client request (URL) to an endpoint. Express.js is responsible for maintaining an advanced routing method like an app.all() that helps in loading all middleware functions like GET, POST, PUT, DELETE, or any other HTTP request method supported in the HTTP module.

Dynamic Templates:

The template engine Pug in Express.js helps the users to fill in details in their applications. At runtime, the template is then sent to the client as a dynamic HTML file.

Easy Debugging:

As debugging is crucial for any application, Express.js follows a debug module that internally logs information about route matches, middleware functions, applications mode, etc. It can, therefore, pinpoint the exact error efficiently.

Advantages of Express.js Framework

Express.js is a popular Node.js framework for many reasons as given under:

  • It has an easy learning curve as it is a JavaSCript-based framework relieving the need to learn a new programming language to work on Express.js.
  • Backend development is quicker and efficient with the use of the Express.js framework.
  • Express.js is a simple framework that is easy to customize based on the client's needs.
  • Express.js offers flexible middleware modules which is a crucial part of any web application development.
  • Node.js is a Google V8 engine, hence running the JavaSCript code is quicker, and so is developing the application as compared to PHP-based web application development.
Why should we use the Express.js framework with Node.js?

It is quite evident from the Express.js features and advantages that why/how Express.js expedites the entire process of server-level programming with its modules. Furthermore, Express.js is a thin layer of fundamental web application framework that doesn’t obscure the Node.js efficiency and features.














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