JSON Minifier
Minify JSON online: strip all whitespace to shrink payloads for faster API responses and smaller storage — see the exact bytes saved, privately in your browser.
Line 1, column 1: Unexpected end of input
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Paste your formatted JSON into the input box.
- 2The minified one-line output appears instantly, with the size saved shown below.
- 3Copy the compact result or clear the input to start over.
JSON Minifier
Paste pretty-printed JSON and get the most compact valid equivalent back in real time: every space, newline and indentation is removed without touching your data. A live size readout shows the original size, the minified size and the percentage saved.
Use it to slim down API responses, fixture files, translations and JSON config before shipping or storing them. If the input is not valid JSON, the tool tells you the exact line and column of the problem instead of failing silently.
Frequently asked questions
Does minifying JSON change the data?
No. Whitespace outside strings carries no meaning in JSON, so removing it produces an equivalent document with identical values when parsed.
How much smaller will my JSON get?
It depends on the indentation you are removing — heavily indented files often shrink by 30–60%. The tool shows the exact percentage for your input.
Is my data sent anywhere?
No. Minification runs entirely in your browser — nothing is uploaded, logged or stored.
Related tools
JSON Formatter
Format and beautify messy JSON online — 2 spaces, 4 spaces or tabs, with instant validation and precise error locations. 100% in your browser.
All tools →
JSON Validator
Validate JSON instantly with precise error line and column. Catch missing commas, unquoted keys, trailing commas and bad escapes before they break your app.
All tools →
CSS Minifier
Minify CSS online: remove comments and needless spaces to cut stylesheet size for faster loads. Instant, private, and safe for your rules.
All tools →
HTML Minifier
Minify HTML in your browser: strip comments and collapse whitespace to cut page weight — a conservative cleaner that keeps your markup and rendering intact.
All tools →
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/json-minifier?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — json-minifier" loading="lazy"></iframe>