JSON Formatter & Validator
Format, beautify and validate JSON with proper indentation and instant error messages. Paste minified JSON and get clean, readable output.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
Is this json formatter & validator safe to use with sensitive data?+
Yes. Everything is processed locally in your browser using JavaScript β your input is never uploaded or stored on a server.
Is my data private?+
Yes. The tool runs entirely in your browser β nothing you paste or type is uploaded to a server.
Guides & deep dives
Common JSON Errors and How to Fix Them
Trailing commas, single quotes, unquoted keys, BOM, NaN β learn what breaks JSON and how to fix each error fast with a free online formatter.
Schema Markup for Beginners: Types That Win Rich Results
Learn how to add schema markup to your site with real JSON-LD examples for FAQ, Article, Product, and LocalBusiness β and avoid the errors that kill rich results.
Base64 Explained: What It Is and When to Use It
Learn what Base64 encoding is, why it adds 33% overhead, how data URIs work, the base64url variant, and exactly when to encode or decode β with worked examples.
CSV to JSON: Handling Headers, Quotes and Nested Data
Master CSV to JSON conversion: RFC 4180 quoting rules, delimiter problems, type inference, and flattening nested JSON back to CSV β with worked examples.