JSON Editor, Formatter & Validator
Format, validate, minify, repair, and explore JSON — a fast, private editor that runs entirely in your browser. Pick a focused tool below or start editing here.
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.
- Does it support JSON Schema validation?
- Yes. Provide a JSON Schema (draft-07 through 2020-12) and we report every violation.