Online Tool Store
JSON Minifier
Validate and minify JSON by stripping all whitespace, with a live byte-savings summary. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How it works
- Paste your JSON.
- It's parsed and re-serialized without whitespace, live as you type.
- Copy the result, and see how many bytes you saved.
FAQ
Does this validate my JSON too?
Yes — it parses your JSON first, so invalid JSON shows a specific error message instead of a broken result.
Does minifying change the data?
No — only whitespace and formatting are removed. Keys, values, and structure are identical, just re-serialized without indentation.
Is my JSON uploaded anywhere?
No — parsing and minifying both happen locally in your browser.
How we compare
| Feature | Online Tool Store | Build tool minification | Manual whitespace removal |
|---|---|---|---|
| Validates JSON along the way | ✓ | ✓ | ✗ |
| No build setup needed | ✓ | ✗ | ✓ |
Setting up a build tool just to minify one JSON payload is overkill. JSON Minifier gives you a smaller, validated payload instantly.