Node.Js: Learning Koa.Js By Building REST APIs

About Node.Js: Learning Koa.Js By Building REST APIs

What is Koa.js?

Koa

is a new web framework designed by the team behind

Express

, which aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. Through leveraging generators

Koa

allows you to ditch

callbacks

and greatly increase error-handling.

Koa

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

Does Koa replace Express?

Koa

is more like

Connect

, but a lot of the

Express

goodies were moved to the middleware level in

Ko

a

to help form a stronger foundation.

Koa

makes middleware more enjoyable and less error-prone to write, for the entire stack, not just the end application code. Typically many middleware would re-implement similar features, or even worse incorrectly implement them, when features like signed cookie secrets among others are typically application-specific, not middleware specific.

Why is not Koa Express4.0?

Koa

is a pretty large departure from what people know about Express, the design is fundamentally much different, so the migration from Express 3.0 to this Express 4.0 would effectively mean rewriting the entire application, so we thought it would be more appropriate to create a new library.

Why you should learn Koa?

Promise based flow in Koa

No Callbacke hell in Koa

Better error handling through try/catch in Koa

Koa is more modular

Better user experience in Koa

Proper stream handling in Koa

What you will learn in this course

Fundamentals of Koa

Building API from scratch in Koa

Integrating Koa with Sequelize

How to use Mysql with Koa

Adding relationship between models in Sequelize

Adding authentication in Koa and Sequelize

Adding documentation for REST APIS in Koa