JSON Formatter & Beautifier
Paste messy JSON and beautify it instantly with clean, configurable indentation. Everything runs locally in your browser — your data never leaves your device.
Runs entirely in your browser — your data never leaves your device.
Frequently asked questions
- Is this JSON formatter free?
- Yes. Formatting, validating, and comparing JSON are free and run entirely in your browser.
- Does my JSON get uploaded to a server?
- No. All formatting happens client-side. Your JSON never leaves your browser.
- Can it handle large JSON files?
- Yes. Heavy parsing and formatting run in a background worker so the page stays responsive on large documents.