Fastify vs Koa: What are the differences?
What is Fastify? Fast and low overhead web framework, for Node.js. Fastify is a web framework highly focused on speed and low overhead. It is inspired from Hapi and Express and as far as we know, it is one of the fastest web frameworks in town. Use Fastify can increase your throughput up to 100%.
What is Koa? 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.
Fastify and Koa can be categorized as "Microframeworks (Backend)" tools.
Some of the features offered by Fastify are:
- 100% asynchronous: all the core is implemented with asynchronous code, in this way not even a millisecond is wasted.
- Highly performant: as far as we know, Fastify is one of the fastest web frameworks in town, depending on the code complexity we can serve up to 20000 request per second.
- Extendible: Fastify is fully extensible via its hooks, plugins and decorators.
On the other hand, Koa provides the following key features:
- Provides 3 different kinds of functions as middleware
- common function
- async function
Fastify and Koa are both open source tools. Koa with 26.4K GitHub stars and 2.4K forks on GitHub appears to be more popular than Fastify with 11K GitHub stars and 674 GitHub forks.
Hostr, Dial Once, and Pubu are some of the popular companies that use Koa, whereas Fastify is used by OTOBANK, Distopik, and Detroit Technical English. Koa has a broader approval, being mentioned in 43 company stacks & 30 developers stacks; compared to Fastify, which is listed in 5 company stacks and 7 developer stacks.