Developer Tools
JSON Minifier
Shrink JSON by removing all whitespace, line breaks and indentation. The minified output is still valid JSON, just smaller — perfect for HTTP responses, embedded payloads and storage. See the before/after byte size at a glance.
Your input is processed locally in your browser. It is not uploaded to Dueneo.
Loading JSON Minifier…
How to use
- 1
Paste your JSON
Drop pretty-printed or minified JSON into the left-hand editor — both work because the input is parsed first.
- 2
Click Minify JSON
The parser runs first to ensure validity, then the value is re-serialised with no spaces between tokens.
- 3
Check the byte savings
Below the action button you will see the before and after byte size and the percentage saved.
- 4
Copy or download
Use Copy for the clipboard or Save to download minified.json to your device.
Common use cases
- Shrink an API response payload before shipping to production.
- Embed JSON inside an HTML attribute without breaking the layout.
- Reduce the size of cached configuration files.
- Prepare a JSON payload for a binary transfer or storage layer.
Limitations
- Minification does not rename keys or shorten values — only whitespace is removed.
- Inputs larger than 1 MB are rejected to keep the tab responsive.
- Escaped Unicode characters (e.g.
\u00e9) are preserved as-is, not converted.