Koa

Koa is a web framework for NodeJS, designed by the team behind ExpressJS. Koa is a smaller, more expressive and more robust foundation for web applications and APIs. By leveraging async functions, Koa means developers do not have to use callbacks and it greatly increases the ability for error-handling. 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 used in Blaze to implement modular, high-performance middleware services for handling core API requests and GraphQL orchestration, allowing the platform to evolve quickly and securely as new services are introduced.

License: Open Source (MIT)