KoaJS in NodeJS

What is KOA?

Widely used server-side framework for Node.js. Koa was created by the same creators of express, another popular backend Jawa Script framework

Koa provides a minimal interface for developing apps and APIs

Accordingly, the creators sought to take into account all the shortcomings of the predecessor and make it more  modern and convenient  to use

Extremely Lightweight

• Smaller footprint than any other Node.js framework including Express.
• Better and Thinner middleware.
• You have the option to extend the framework with an added module

Modern Framework

• Koa is Built ES6+ and promotes modern JavaScript syntax
• Uses generators and async /await.
• Helps devs create apps that remain relevant over a long period of time

Request and Response

• Koa uses a req and res object on top of the standard vanilla JS request and the response
• It accelerates HTTP server development by providing additional functionality
• Encapsulates req/res into a single object using context. This helps devs build APIs more efficiently by using a number of helpful methods

Advantages of Koa

• Fast and efficient 
• Modernized syntax
• Very small footprint but easily extended
• Simple to learn if you know Express
• Enhanced HTTP req, res

Disadvantages of Koa

•   insufficient community support

How is koa.js different from Express 

1. promise based flow 
2. No callback hell
3. Better error handling through try-catch block
4. Koa is more modular
5. Proper stram handling
6. Better user experience

How to install koa.js 

You can quickly install a supported version of the node with your favorite version manager

      $ nvm install 7

     $ npm install koa -save-dev

     $ node my-koa-app.js

Example of  a sample koa.js server

const Koa=require('koa');

const app = new Koa();

app.use(ctx => {

    ctx.body = 'Hello World';

});

app.listen(3000);

console.log('Application is running on port 3000');