Compress valid JSON
Remove indentation, line breaks and extra spacing from API responses, config snippets and structured data.
JSON Minifier
Validate and compress JSON into compact output.
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Minify API responses, config snippets, test fixtures and structured data by removing formatting whitespace from valid JSON.
- JSON validation
- Whitespace removal
- Compact one-line output
- Copy and download output
Catch syntax problems first
The minifier parses the pasted JSON before creating output, so invalid syntax is reported before you copy the compact version.
Compare input and output size
Character counts make it easier to see how much formatting was removed from the original JSON.
Private browser-based minifying
The minifier runs locally in your browser, so pasted JSON does not need to be uploaded to a server.
Frequently asked questions
It parses pasted JSON, validates it and returns a compact version without formatting whitespace.
No. It keeps the same parsed JSON values and only changes the formatting of valid JSON output.
Yes. Use Format Input to make the pasted JSON easier to review before generating the minified output.
No. The tool runs in your browser, so pasted JSON is processed locally on your device.