Swap.js – a JavaScript micro-framework (HTML fragments over the wire)

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

Swap.js is a "HTML-over-the-wire" AJAX-navigation micro-library - josephernest/Swap.js

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…

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