Text Tools
JSON Formatter & Validator
Format, validate, and minify JSON instantly.
Paste raw JSON and instantly format it with proper indentation, validate it against the JSON spec, or minify it for transport. A core utility for any developer working with APIs or config files.
Use the tool
What this tool does
A JSON formatter parses your input, validates it, and re-emits it with consistent indentation. A validator highlights syntax errors with line numbers. A minifier strips all whitespace to produce the smallest possible output for network transport.
Why people use it
- API responses are usually minified — formatting them makes debugging much easier.
- Hand-written JSON config files are easy to break with a stray comma; validation catches it instantly.
- Minified JSON is slightly smaller over the wire, useful for high-traffic APIs.
- Reviewing webhook payloads in formatted form is far easier than reading a single line.
Step-by-step guide
- Open the JSON Formatter & Validator tool.
- Paste your raw JSON into the input area.
- Click ‘Format’ to indent it, ‘Validate’ to check syntax, or ‘Minify’ to compact it.
- Copy the result to your clipboard.
Real examples
Debugging a Stripe webhook
A developer pastes a raw webhook payload, formats it, and quickly sees the nested object structure they’re mapping into their database.
Cleaning up a package.json
A maintainer formats a package.json that’s grown messy from manual edits and merges.
Common use cases
- API debugging
- Webhook inspection
- Config file editing
- Sharing JSON in documentation
- Minifying for production
Frequently asked questions
Is my JSON sent anywhere?
No. All parsing, formatting and validation happens in your browser.
Will it preserve key order?
Yes. Formatting uses JSON.stringify with a replacer that walks the parsed structure in order.