About JSONNeat
JSONNeat is a small set of JSON tools — a formatter, validator, minifier, JSON-to-CSV converter and an escape utility — that run entirely in your browser. I built and maintain it on my own; the data you paste never leaves your device.
Why I built this
I format JSON dozens of times a week. Most online formatters I'd tried did at least one of three things I didn't want: showed intrusive ads inside the editor, uploaded the JSON to a remote server, or took several seconds to load on mobile. So I built the version I wanted to use.
JSONNeat opens in under a second, runs every operation locally in your browser, and stays out of the way. I use it every day, and I keep adding small tools to it when I run into a JSON task that doesn't have a good home on the web.
How JSONNeat is built
The site is a static React app served from a CDN. Each tool is plain JavaScript that executes inside your browser tab — the formatter and validator both call the native JSON.parse, the same engine your backend would use, so the output is byte-identical. I never see what you paste; the data only leaves your tab if you copy it somewhere else.
The whole site is a few hundred kilobytes of compressed assets, and after the first load it works offline. There's no backend, no database, no user account, and no tracking of what you paste. The architecture is deliberately boring.
What I publish
Alongside the tools, I write guides about JSON in real-world software engineering — common errors and how to debug them, JSON Schema, the precision trap with large integers, REST API design conventions. The articles are the explanations I wish I'd had when I was learning these patterns. The full list lives on the blog.
Our principles
- Privacy first. Your JSON never leaves your device. The tools work offline once loaded.
- Performance. Sub-second loads, instant formatting, no spinner-fatigue on multi-megabyte files.
- Free forever. No paywalls, no signup, no upsell flows. Modest, clearly-labelled ads keep the lights on; the tools themselves stay unrestricted.
- Useful by default. Every page is meant to answer your immediate question and link out to deeper material if you want it. We don't bury the tool under a marketing page.
Who maintains JSONNeat
JSONNeat is built and maintained by an independent developer working on the site in their spare time. There is no team, no investors and no roadmap meeting — features get added when I run into a JSON task that doesn't have a good home on the web, and I keep the lights on with modest display ads outside the editor. If you spot a bug, an outdated explanation, or a feature you'd find useful, write to [email protected] and it gets read by a person.
Contact
Bug reports, feature requests, or general feedback are welcome at [email protected]. If you've found a tool you wish JSONNeat had, tell me — most of what's on the site exists because someone asked for it.