I made a HTMX Playground 100% in the browser
I recently dug up an old project in an attempt to improve on it. It's a code sandbox for playing around with HTMX in the browser, that runs a mock server within the sandbox iframe. The server "framework" is loosely based on Django, so if you're familiar with Django, you'll immediately understand what's going on. I recommend clicking through the examples. Github repo: https://github.com/lassebomh/htmx-playground Probably my favorite part is the lack of HTMX specific code. It's designed to mimic the client and server, but really nothing else. In principle, this means that…
I made a HTMX Playground 100% in the browser launched on January 8, 2024 with 482 votes, #45 of 4,437 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
HTMX Playground is a browser-based code sandbox for experimenting with HTMX interactions without leaving the browser. It includes a mock server framework inspired by Django that runs within an iframe, letting developers write and test both client and server code. The tool works without HTMX-specific code, making it framework-agnostic and useful for learning how HTMX handles client-server communication through practical examples.
written from the facts on this page · September 2026
From the sources
Learn HTMX with examples, and use the playground to write code in a backend-like environment, running entirely inside the browser. You can define endpoints within server.js and render your own templates. It will run a mock server that intercepts outgoing requests from HTMX.
HTMX Playground is a simple code sandbox for playing around with HTMX. No setup needed! Check out the examples! I've adapted them from the original htmx.org examples . It allows you to write code in a backend-like environment, running entirely inside the browser. You can define endpoints within server.js and render your own templates. It will run a mock server that intercepts outgoing requests from HTMX. The request handling and templating engine should be very familiar to people who use Django. In principle, this project isn't specific to HTMX, so you are free to try out other libraries as well. Additionally, server.js can be stateful (such as in the Click to Edit example), but any update…from lassebomh.github.io
In the maker’s words, at launch
I recently dug up an old project in an attempt to improve on it. It's a code sandbox for playing around with HTMX in the browser, that runs a mock server within the sandbox iframe. The server "framework" is loosely based on Django, so if you're familiar with Django, you'll immediately understand what's going on. I…
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