JSON Minifier
Compress JSON by removing whitespace. Free, no signup.
How It Works
Paste formatted JSON and click Minify. All whitespace, line breaks, and indentation are removed to produce the most compact valid JSON string. The size reduction is shown below.
Why Minify JSON?
Minified JSON takes less bandwidth to transmit and less storage space. It is the standard format for API responses, configuration payloads, and data stored in databases. Removing formatting can reduce file size by 30-60%.
Minified vs. Formatted JSON
The two layouts hold identical data — they differ only in whitespace. Minified JSON is best for machines and transport; formatted JSON is best for reading and debugging. This tool produces the compact form; the JSON Formatter reverses it.
| Aspect | Minified | Formatted |
|---|---|---|
| Whitespace | None | Indentation & line breaks |
| File size | Smallest | Larger |
| Human readable | Hard | Easy |
| Best for | APIs, storage, transfer | Editing, review, diffs |
| Data content | Identical | Identical |
Frequently Asked Questions
How do I minify JSON online?
Paste your formatted JSON into the input box and click Minify. The tool parses your JSON and re-serializes it with no spaces, line breaks, or indentation, producing the most compact valid JSON string. The original and minified character counts and the percentage saved are shown below the output.
Does minifying JSON change the data?
No. Minifying only removes whitespace between tokens. Every key, value, array, and nested object is preserved exactly, so the minified JSON is semantically identical to the original and parses to the same data. Only the formatting is stripped.
How much smaller does minifying make my JSON?
It depends on how much indentation and whitespace the original had, but pretty-printed JSON typically shrinks by 30-60% once formatting is removed. This tool shows the exact before and after character counts and the percentage reduction for your specific input.
What is the difference between minifying and formatting JSON?
Minifying removes all whitespace to make JSON as compact as possible for transmission and storage. Formatting (or beautifying) does the opposite, adding indentation and line breaks so JSON is easy for humans to read. Use the JSON Formatter to expand minified JSON back into a readable layout.
Is my JSON uploaded to a server?
No. Minification runs entirely in your browser using JavaScript. Your JSON is never sent to a server, so it is safe to compact sensitive or private data with this tool.