Format and minify
Add readable indentation or turn valid JSON into a compact one-line value.
DEVELOPER & DATA TOOLS
JSON Formatter & Validator
Format complex JSON and identify syntax errors quickly.
FreeNo sign-upProcessed in your browser
Format JSON
Your JSON is not sent to a server.
When should you format JSON?
Use this tool to make API responses, config files, and logs easier to read, or to validate their syntax before sharing them.
Private by design
Your data stays in the current browser.
DEVELOPER & DATA TOOL
JSON formatter and validator for readable, valid JSON
Paste JSON to add readable indentation, validate its syntax, or minify a valid value for a compact payload.
When to use it
Use it to inspect an API response, clean up a configuration file, or catch a JSON syntax error before sharing.
How to use it
- Open the tool and add the file, text, or value you want to work with.
- Use the available controls to review, edit, convert, or test the result.
- Check the result, then save, copy, or export it when needed.
Frequently asked questions
Does formatting repair invalid JSON?
No. The validator identifies syntax problems, but it does not guess or silently rewrite invalid values.
Is minified JSON different data?
No. Minifying removes unnecessary whitespace from valid JSON without changing its data structure.