Swap.js – a JavaScript micro-framework (HTML fragments over the wire)
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…
In plain words
Swap.js is a lightweight JavaScript micro-framework that enables AJAX-style page updates by fetching and swapping HTML fragments from the server. It targets developers seeking an alternative to heavy client-side frameworks like React, allowing them to build dynamic web applications using HTML, plain JavaScript, and any server-side language without requiring bundlers, compilers, or build tools. The framework uses the Fetch API and MutationObserver to detect and handle DOM changes automatically.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
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 framework makes use of fetch (of course) but also MutationObserver API to be able to launch actions when parts of the DOM change. Let me know what you think!
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