Mizu.js – Lightweight HTML templating library for any-side rendering
Hey HN, I'd like to share a fun project I've been working on: mizu.js. It's a js library that add functional attributes support into your html, designed to be a simple and flexible alternative to fully-fledged web frameworks (such as Vue, React, and Angular), while offering more capabilities than other lightweight options (like Alpine.js and htmx). As it's written using modern ES features and due to its isomorphic nature, it can be run in both browsers and runtimes (Node, Deno, Bun) without any changes. This makes it ideal for client-side and server-side rendering, as well as static site…
In plain words
Mizu.js is a JavaScript templating library that adds functional attributes to HTML, positioned between lightweight tools like Alpine.js and full frameworks like React. Written with modern ES features, it runs isomorphically in browsers and server runtimes like Node, Deno, and Bun without modification, supporting client-side rendering, server-side rendering, and static site generation. It requires no configuration or transpilation and provides templating, attribute binding, interactivity, HTTP handling, and custom components out of the box.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN, I'd like to share a fun project I've been working on: mizu.js. It's a js library that add functional attributes support into your html, designed to be a simple and flexible alternative to fully-fledged web frameworks (such as Vue, React, and Angular), while offering more capabilities than other lightweight options (like Alpine.js and htmx). As it's written using modern ES features and due to its isomorphic nature, it can be run in both browsers and runtimes (Node, Deno, Bun) without any changes. This makes it ideal for client-side and server-side rendering, as well as static site generation, whichever environment you prefer. Just include the script in any web page (or backend) to get started. You can template content, bind attributes, add interactivity, handle HTTP interactions, create custom components, and much more — all out of the box, without any configuration, transpilation steps, or builds. I hope you'll find mizu.js as exciting and useful as I do and I'd love to get your feedback! You can learn more about it at https://mizu.sh! Online playground: https://mizu.sh/playground Custom builder: https://mizu.sh/build Code coverage: https://mizu.sh/coverage GitHub: https://github.com/lowlighter/mizu ## Motivation ## Nowadays, setting up a complete environment and installing thousands of packages is often required just to create a simple "Hello World" page. Yet, with the current ECMAScript standard, vanilla JS has never been more powerful. It offers built-in custom HTML components, proxies for changes tracking, weak references for better memory management, and many new data structures and methods. So why is web development still insanely complex? mizu.js aims to avoid adding bloat on top of native features, and instead focus on providing convenience helpers. It's basically "glue" around all these native features with added sugar, a recipe for a lightweight yet powerful utility. All evaluated expressions are interpreted as vanilla JavaScript, and you add your instructions directly into your HTML. So if you know already know about JS/HTML, then you're already 80% know of how to use mizu.js (add an extra 10% if you've used Vue, Alpine.js or htmx in the past as some syntax and concepts are inspired by it), the rest is basically just remembering the directive names. The learning curve is that small. Also, you may have heard of https://matcha.mizu.sh, a CSS stylesheet to instantly make your web page stylized. Well, it's a great companion to mizu.js. With both of them, you can create MVPs for your projects super fast!
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