Prettify JSON
Format, indent, validate, and optionally alphabetize keys in nested JSON payloads.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. No data is ever transmitted across the network.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
How to Use Prettify JSON
Enter raw or compact JSON payload.
Select 2, 4, or 8 spaces and optional key sorting.
Copy clean formatted JSON.
Frequently Asked Questions
Does it validate JSON syntax?
Yes, syntax errors and line issues are caught and displayed immediately.
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