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Node JS is a fast JavaScript runtime environment that we use to build server-side applications, but it does not know how to perform serving files, handling requests, and handling HTTP methods, so this is where express js comes in.

Express JS is a Node.js framework designed to build API's web applications cross-platform mobile apps quickly and make node js easy.

What Is Express JS?     

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

It's a layer built on the top of the Node js that helps manage servers and routes.

Why Express JS?

• Express was created to make APIs and web applications with ease,
• It saves a lot of coding time almost by half and still makes web and 
• mobile applications are efficient.
• Another reason for using express is that it is written in javascript as javascript is an easy language even if you don't have a previous
• knowledge of any language. Express lets so many new developers enter the field of web development.

The reason behind creating an express framework for node js is:

• Time-efficient
• Fast 
• Economical
• Easy to learn
• Asynchronous

Advantages of Using Express With Node.js

• Express is Unopinionated, and we can customize it.
• For request handling, we can use Middleware.
• A single language is used for frontend and backend development.
• Express is fast to link it with databases like MySQL, MongoDB, etc.
• ​​Express allows dynamic rendering of HTML Pages based on passing arguments to templates.

Limitations of Express JS

• Sometimes, there is no structural way to organize things, and the code becomes non-understandable.
• There are so many issues with callbacks.
• The error messages that will come are challenging to understand.

Companies That Are Using Express JS

•  Netflix 
•  IBM 
•  ebay
•  Uber

Folder Structure

Dependencies Used