JSON Formatter & Validator
Format, validate, and minify your JSON data securely in your browser.
100% offline, privacy-first, and ultra-fast.
Input JSON
Formatted Output
Frequently Asked Questions
Is this JSON formatter secure?
Yes. It processes all data 100% on the client-side within your browser. No data is ever sent to any server.
Can it handle large JSON files?
Absolutely. We use Web Workers to process huge JSON payloads without freezing your browser.
How do I format JSON?
Just paste your JSON into the left panel and it will be automatically formatted and validated in the right panel.
Does it highlight syntax errors?
Yes, it provides precise line-number error highlighting if your JSON is invalid.