Firebase is described as 'Provided by Google, is a backend service and application development platform. It uses AI, cloud infrastructure, and cross-platform SDKs for efficient app development. Firebase offers tools and infrastructure for app creation and business growth' and is a popular backend as a service in the development category. There are more than 100 alternatives to Firebase, not only websites but also apps for a variety of platforms, including Self-Hosted, SaaS, Linux and Mac apps. The best Firebase alternative is Supabase, which is both free and Open Source. Other great sites and apps similar to Firebase are PocketBase, TrailBase, Appwrite and Directus.
Expressive middleware for node.js using generators via co to make web applications and APIs more enjoyable to write. Koa's middleware flow in a stack-like manner allowing you to perform actions downstream, then filter and manipulate the response upstream.
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Koa could be used to make a firebase alternative but not without a lot of work.