JSON Formatter
Format, minify, and validate JSON. No signup required.
About this tool
The JSON formatter helps you format, minify, and validate JSON. Paste or type JSON and click Format to pretty-print it with indentation, or Minify to remove whitespace. Use Validate to check if your JSON is valid without changing it. All processing happens in your browser. Nothing is sent to a server or stored.
How it works
Format uses JSON.stringify with indentation to produce readable output. You can choose 2 spaces, 4 spaces, or tabs. Minify removes all unnecessary whitespace to reduce file size. Validate parses the input and reports any syntax errors, including the position and type of the problem.
Practical examples
- API responses: paste raw JSON to format it for debugging or documentation.
- Config files: minify JSON before embedding in HTML or sending over the network.
- Before committing: validate JSON configs or data files to catch errors early.
- Logs and exports: format minified logs to inspect structure and values.
Limitations
The formatter does not preserve comments or trailing commas, as these are not part of standard JSON. Very large files (millions of characters) may cause the browser to slow. For JSON with comments (JSONC) or other extensions, use a specialized tool.