I built a free JSON formatter in a single HTML file (no libraries, no backend)

Title: I built a free JSON formatter in a single HTML file (no libraries, no backend) Tags: javascript webdev beginners opensource Content: I've used a lot of JSON formatters online. Most of them require an account, show aggressive ads, or send your data to a server. So I built one that does none of that — a single HTML file, no dependencies, runs entirely in the browser. Here's what's inside it and how I built it. The constraints I set for myself One file only. No npm, no bundler, no framework.