FastDom – Lightweight replacement of React and MobX

In plain words

FastDom is a lightweight JavaScript library that serves as an alternative to React and MobX for building user interfaces. It provides developers with a simpler approach to DOM manipulation and state management without the overhead of heavier frameworks. The library is designed for developers who need reactive UI updates with minimal dependencies, making it suitable for projects where bundle size and performance are priorities over feature richness.

written from the facts on this page · September 2026

• IM
  I made React with a faster Virtual DOM2022 · ▲109

  Hi! I made a React compatibility library for a Virtual DOM library (https://github.com/aidenybai/million). The idea is to have much faster rendering (a compiler optimizes virtual DOM beforehand) while ensuring the same developer experience React provides. This is very, VERY early stage, so be prepared for weird bugs / plugin incompatibility / etc. If you have any suggestions, I'd be more than happy if you replied in a comment with it! You can spin up the demo here >> https://stackblitz.com/github/aidenybai/million-react-compat

• 
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  Swap.js – a JavaScript micro-framework (HTML fragments over the wire)2023 · github.com · ▲127

  Hi HN! I created this lib in the need of a simple and tiny framework to easily do AJAX-style navigation / replacement of fragments in the page, in a web application. For people who don't want to use client-side-rendering and complex frameworks à la React, there are nowadays a few "HTML-over-the-wire" libraries, like HTMX, Unpoly or this super-tiny one Swap.js :) One other key thing is that no external tool is needed: no bundler, no webpack, no TypeScript compiler, no minification needed. Just write HTML, JS (+ your preferred server-side language: PHP, Python, etc.) and it works. The…

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  Million.js v2.0.02023 · millionjs.org · ▲98

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• AJ
  A JavaScript UI library for imperative JSX2024 · npmjs.com · ▲41

  I've been building a web UI library for a side project of mine. I thought it might be useful to others, so I'm releasing it as open source. To put it simply, I realized that most of my pain points with React come from its declarative model ui=f(state). So I'm trying something that I'm calling "imperative JSX." Instead of treating JSX as the source of truth for your UI, it essentially becomes a query interface for DOM manipulation. I first had the idea for it a few months ago, and only began writing it in earnest last week, so it's extremely early and nowhere near production-ready. Still, I'd…

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