ExpressJS vs Koa: What are the differences?
Developers describe ExpressJS as "Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple". Express is a minimal and flexible node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications. On the other hand, Koa is detailed as "Next generation web framework for node.js". Koa 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.
ExpressJS and Koa can be categorized as "Microframeworks (Backend)" tools.
Some of the features offered by ExpressJS are:
- Robust routing
- HTTP helpers (redirection, caching, etc)
- View system supporting 14+ template engines
On the other hand, Koa provides the following key features:
- Provides 3 different kinds of functions as middleware
- common function
- async function
ExpressJS and Koa are both open source tools. It seems that ExpressJS with 44.6K GitHub stars and 7.48K forks on GitHub has more adoption than Koa with 26.6K GitHub stars and 2.42K GitHub forks.
According to the StackShare community, ExpressJS has a broader approval, being mentioned in 854 company stacks & 788 developers stacks; compared to Koa, which is listed in 44 company stacks and 31 developer stacks.
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Express.js is the workhorse of the Cloudcraft.co backend. It's not the most exciting part of a stack, but it works, is very well documented, and you can find a plugin for almost everything you could possibly want. We also carefully evaluated Koa.js, but decided not to go down this route: fewer plugins, less documentation & answers online. I'm also not personally convinced by the generators yield syntax at all. ES7 async functions looks like a much better bet, and with Promises and Babel I can have that already today.
I use express.js for nightly.zerotoherojs.com and dojo.zerotoherojs.com web apps.
Express is well-known, lightweight, works out-of-the-box, has great middleware support and has minimal learning curve.
It is the best framework to start developing a general Node.js web app.
I'm fluent in ExpressJS, but over the past two years I have moved to HapiJS. Similar results, but I find Hapi to be more full-featured towards my app, api and service needs. I can operate confidently in both.
PrometheanTV utilizes the ExpressJS web application framework to deploy various web applications and services including the Broadcast Center Tool, our video embed service, and our REST API.
We rely on ExpressJS to serve our content simply, easily, and effectively, without the bloat-ware. Big thanks to StrongLoop for supporting this package.