JSON Tools
JSON Minifier
Remove whitespace from valid JSON to create compact payloads and fixtures.
JSON text
Processed locally — your data never leaves this browser.
Minified JSON
Example input and output
Pretty object
{
"name": "Lumarc"
}{"name":"Lumarc"}How to use JSON Minifier
Paste or enter your json text, adjust any options, then run the tool. The result appears in the output panel where you can copy or download it.
Related guides
What this tool does
The JSON Minifier validates JSON and outputs the smallest standards-compliant representation produced by JSON.stringify. It is free to use and designed for technical workflows where pasted data should stay private.
Common use cases
- Reduce fixture size
- Compact API examples
- Normalize JSON before comparing payloads
Privacy and security
Processed locally — your data never leaves this browser. Lumarc DevTools does not include a backend, account system or hidden analytics in this initial release.
Limitations
- Invalid JSON cannot be minified.
Frequently asked questions
Does minifying JSON change values?
No. It preserves parsed JSON values while removing formatting whitespace.