Koa js

Koa was created by the team that created the Express. It is a smaller, more expressive, and more robust foundation for web applications and APIs. A Koa application is an object containing an array of middleware functions that are composed and executed in a stack-like manner upon request.

Difference between Koa and Express

There is no internal routing package in Koa. Koa does not support internally routing. but it provides an external third-party router package. You have to include the external third-party package in routing. But Express has a built-in routing package.

There is no built-in templating engine in Koa but Express provides built-in templates like JSON handlebars.

Koa does not have a built-in feature to search static files but it provides an external third-party party package. Express has a built-in method which is express.static to search static content

Express also has a JSONP module and Koa does not have a JSONP module.

Why did they not include these features in Koa?

Because they want to make koa fast. The main purpose of koa is to make a fasters Node JS framework.

Koa is a very lightweight framework. It makes the code management process very easier.

Why Koa?

Koa does not bundle any middleware within its core, and it provides an elegant suite of methods that make writing servers fast and enjoyable.

Koa is very lightweight, with just 550 lines of code and better error handling through try/catch

Very clean and more readable async code

Koa allows you to avoid using callbacks by using async functions.

Koa has significantly increase error handling.

Koa is more modular. And it provides a better stream handling rather than Express

It is very fast and can handle more requests than express js

Koa can give a better user experience.

Installation

Koa requires node v7.6.0 or higher for ES2015 and async function support. You must install Node.js before installing Koa.

npm i koa