Fast by default
Static site built with Astro. No sluggish ad-heavy layouts. 1 MB JSON parses in under 200 ms on modern devices.
Format code. Keep it private. Learn the format.
Beautify, minify, and validate JSON — with XML and HTML coming soon. All parsing runs on your device. No uploads. No tracking of your inputs.
Private by design
JSON parsing happens in a Web Worker on your device. Your code is never sent to our servers in the MVP.
More than a tool
Each format page ships with a short guide and a glossary of related terms so you can learn while you work.
Accessible & mobile-friendly
Keyboard shortcuts, a proper dark mode, and a layout that works on your phone during a late-night debug session.
Featured guides
What Is JSON? A Plain-English Guide to JavaScript Object Notation
JSON is the lingua franca of web APIs. This guide walks through its syntax, its data types, the trade-offs that shaped it, and the small gotchas that trip up newcomers.
Read →The 10 Most Common JSON Syntax Errors (and How to Fix Them)
Most JSON parse errors come from a handful of mistakes. This reference covers the ten offenders we see most, what their error messages look like, and how to fix each one quickly.
Read →JSON vs YAML: When to Use Which Format
JSON and YAML solve overlapping problems but optimise for different users. This guide compares their syntax, strengths, and failure modes so you can pick the right one without regret.
Read →JSON Schema Basics: Validating Data with Confidence
JSON Schema is how you describe, document, and enforce the shape of a JSON document. This primer walks through the core keywords and the workflow that makes them pay off.
Read →Available tools
- JSON Beautifier, Minifier & Validator — available now
- XML Beautifier — planned
- HTML Beautifier — planned