How to use JSON Formatter
- Add or paste your input above.
- Click the action button to run JSON Formatter.
- Copy or download your result.
About the JSON formatter
A JSON formatter takes minified or messy JSON and pretty-prints it with clean indentation so it is easy to read and debug. It also validates the JSON and reports the location of syntax errors such as missing commas or brackets.
Tips
- Invalid JSON is flagged so you can find and fix syntax errors.
- Use 2-space indentation for compact, readable output.
- Pair with the JSON Minifier when you need to shrink it again.
JSON Formatter — frequently asked questions
- Does the formatter validate my JSON?
- Yes. If your JSON has a syntax error, the tool reports it so you can correct it before formatting.
- Why won't my JSON format?
- Usually a trailing comma, single quotes, or an unclosed bracket. Standard JSON requires double quotes and no trailing commas.
- Is JSON Formatter free to use?
- Yes. JSON Formatter is completely free with no sign-up, no watermarks and no usage limits.
- Is my data uploaded to a server?
- No. JSON Formatter runs entirely in your browser, so your data never leaves your device.
- Is there a size limit?
- Only your device's available memory — there are no server-side limits because nothing is uploaded.