JSON Formatter & Validator
Format, validate and beautify JSON with clear error reporting.
Free to use · No sign-up · Runs in your browser · Your data is never uploaded.
What the JSON Formatter & Validator does
The JSON formatter beautifies messy JSON into readable, indented output and validates it, reporting exactly where any syntax error occurs.
How it works
The tool parses your JSON and re-serialises it with consistent indentation. If the JSON is invalid, it reports the error and the position so you can fix it quickly.
It is useful for checking API responses, configuration files and structured data before you deploy them.
How to use the JSON Formatter & Validator
- 1Paste your JSON.
- 2Choose to format or minify it.
- 3Run the tool.
- 4Fix any reported errors.
- 5Copy the clean, valid JSON.
JSON Formatter & Validator questions
It adds indentation and line breaks so the structure is easy to read, without changing the data.
The tool reports any syntax error and its location, so you can correct it.
Yes. Minifying removes whitespace to produce the smallest valid representation.
Common causes are trailing commas, single quotes instead of double quotes, and unescaped characters.
Related SEO tools
Ready to build links that move rankings?
Use our vetted marketplace of 2,000 sites or let us run a done-for-you campaign with white-label reporting.