JSON Minifier Developer
Strip every unnecessary space from JSON and see how much you saved.
JSON Minifier is a free online tool that strip every unnecessary space from JSON and see how much you saved. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Developer
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- None — it just works
- Works offline
- Yes, after the first visit
About JSON Minifier
Every byte of insignificant whitespace is removed. In JSON, all whitespace between tokens is insignificant — the format has no significant indentation and no comments to preserve — so minification is completely lossless and the parsed result is identical. A typically formatted API payload shrinks by 15–25%, and rather more if it is deeply nested.
How to use it
- Paste the text you want to run through json minifier.
- There is nothing to configure — the result updates as you type.
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
Questions
Does minifying change the data?
Not at all. Key order is preserved and values are untouched. Parsing the minified output yields exactly the same object.
Is it worth minifying if the server uses gzip?
Less than you would think — compression handles repeated whitespace very efficiently, so the additional saving is often only a few percent. It still helps when the JSON is stored, logged or embedded in a page.