JSON Minifier
Free online tool · runs in your browser
Compact JSON for production payloads.
Quick tutorial
- 1Paste valid JSON.
- 2Click Minify.
- 3Copy or download the compact result.
Free online json minifier
Minify JSON online to strip whitespace and shrink payloads for APIs, localStorage, or static files. This JSON minifier compacting valid JSON with JSON.stringify, then shows input vs output size so you can see the savings. Invalid JSON is rejected instead of silently corrupting data. All minification stays on your device.
How to use JSON Minifier
- Paste valid JSON.
- Click Minify.
- Copy or download the compact result.
Limitations
- Invalid JSON cannot be minified.
Example
Input
{
"a": 1
}Output
{"a":1}FAQ
Frequently Asked Questions
Does minifying JSON change values?
No. It only removes insignificant whitespace. Key order is preserved.
Can I undo JSON minify?
Use the JSON Formatter to pretty-print the compact output again.
Will key order change?
No. JSON.stringify preserves key order.
Is JSON Minifier free to use?
Yes. JSON Minifier on ShadowReference is free, with no account, no watermarks, and no server-side processing.
Does this tool send my data to a server?
No. All processing happens locally in your browser. Your input never leaves your device.