News & Guides
Articles, tutorials, and updates from the JSON Formatter App team.
New: JSON to Java, C#, Python & Rust generators
Four new code generators just landed: paste a JSON sample, get typed classes for Java, C#, Python, or Rust — generated in your browser by quicktype, never uploaded to any server.
Read more →7 best JSONFormatter.org alternatives in 2026
After the November 2025 leak, many developers are looking for a safer JSON formatter. An honest, hands-on comparison of seven alternatives — JSON Hero, JSON Crack, transform.tools and more — with pros, cons, and when to pick each.
Read more →Is JSONFormatter.org safe to use in 2026?
Short answer: for non-sensitive data, yes. For anything containing credentials, configs or customer data, no — and you should pick a client-side tool instead. The full reasoning, plus a 30-second test for any tool.
Read more →The CodeBeautify data leak, explained
A technical deep dive into the November 2025 CodeBeautify.org leak disclosed by watchTowr Labs — the root cause, the 80,000+ files exposed, what was in them, and the standard post-incident checklist.
Read more →How to pick a secure JSON formatter online
A vendor-neutral guide to evaluating online JSON tools for real security — red flags, green flags, the DevTools Network-panel test, and a checklist you can apply to any tool before pasting sensitive data.
Read more →The JSONFormatter.org breach: what was leaked — and how to format JSON safely
In November 2025, JSONFormatter.org and CodeBeautify.org were disclosed to have publicly exposed years of user-pasted data, including API keys and cloud credentials. Here is what happened and what to do about it.
Read more →What is JSON? A beginner-friendly guide
A clear, jargon-light introduction to the data format that powers the modern web — what it is, why it won, syntax basics, and the six data types.
Read more →JSON vs YAML vs TOML: which config format should you use?
A practical, opinionated comparison of the three dominant config formats — strengths, weaknesses, when to use each, and how to convert between them.
Read more →How to validate JSON against a JSON Schema
A hands-on guide to JSON Schema — what it is, how to write one, draft 2020-12 basics, common keywords, and how to validate documents locally in your browser.
Read more →What's new in this version
Every feature runs 100% in your browser.
🛠 Tools panel
One drawer with Schema validation, jq, format conversion, and JSONPath — all client-side.
🧪 JSON Schema validator
Validate against draft 2020-12 schemas with detailed error paths and keywords (Ajv-powered).
⚡ jq playground
Real jq compiled to WebAssembly. Full syntax: select, map, sort_by, recursive descent, and more.
🔄 Format converters
JSON ↔ YAML/XML/TOML/CSV, plus TypeScript and Go struct generation via quicktype.
🌳 Tree & table views
Visualize JSON as an expandable tree or sortable table with inline editing.
🔒 Privacy-first
No backend, no tracking cookies, no share-link feature. Your JSON stays on your device.