About this JSON formatter
A fast, private JSON formatter for developers, testers and API users
The FreeConvertors JSON formatter is a free online tool that takes raw or minified JSON and re-prints it with clean indentation so the data structure becomes readable at a glance. It also validates your input, so invalid JSON is caught immediately instead of silently breaking your workflow.
Developers use it to inspect API responses, configuration files, webhook payloads and database exports. Testers use it to verify output structure, and students use it to understand how nested objects and arrays are organised. Because the tool runs entirely in the browser, sensitive data is never uploaded to a server.
How to format JSON
Paste your JSON into the input area. The output panel instantly shows a formatted version with your chosen indentation, or a minified single-line version. Copy the result or download it as a .json file. If the input contains a syntax error, the tool highlights the exact error message.
Why use this tool with other FreeConvertors tools
JSON and XML conversions are common in development. If you also need to convert JSON into XML, open the FreeConvertors JSON to XML converter. Together they cover formatting, validation, minification and format conversion in one place.