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Express JS

According to Wikipedia​

Express.js, or simply Express, released in 2010 by TJ Holowaychuk, is a back-end web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building simple APIs to build websites, and web apps using JavaScript (and TypeScript). It has been called the de facto standard server framework for Node.js.

Plenty of other modern node.js backend frameworks like Nest.js, and Loopback built on top of express.js, and use it as a base framework.

Purpose​

Developers use it for building Rest APIs, Web Apps, and Web Services.

Features​

  • Fast
  • Minimal
  • Flexible
  • Robust
  • Secure
  • Scalable

Why Express?​

Unlike its competitors like Rails and Django, which have an opinionated way of building applications, Express has no "best way" to do something. It is very flexible and pluggable.

Companies Use Express​

1783 big companies reportedly use ExpressJS in their tech stacks, including Twitter, Accenture, and Stack.

  • Twitter.
  • Accenture.
  • Stack.
  • Client Platform.
  • Intuit.
  • Trust pilot.
  • Be-pro Company.
  • BlaBlaCar.
  • Uber.
  • Airbnb.

Express vs. Node.js​

Express is a framework that uses Node.js as a runtime environment. It is a web application framework that provides a robust set of features to develop back-end web applications.

Conclusion​

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications.