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JSON Minifier

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Strip every unnecessary space and line break from JSON to get the smallest valid representation — with the size saving shown.

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How to use this tool

  1. Paste formatted or messy JSON.
  2. Click Minify.
  3. Check the size reduction shown.
  4. Copy the single-line output.

About this tool

Minified JSON is what you want in config payloads, HTTP requests and storage: identical data, fewer bytes. The tool validates first (so you never ship broken JSON), then re-serializes without whitespace and reports the before/after sizes. Minification is fully reversible — run the output through the JSON Formatter to make it readable again.

Frequently asked questions

Does minifying lose any information?
No. Only insignificant whitespace is removed; every key and value survives byte-for-byte. Formatting it again restores readability.
How much smaller does JSON get?
Typically 10–40% depending on indentation depth and structure — deeply nested, heavily indented documents shrink the most. The exact figure is displayed after minifying.
Will it fix invalid JSON while minifying?
No — invalid input is rejected with a specific error. Minifying broken JSON would just move the problem downstream.

Related tools

JSON FormatterPaste minified or messy JSON and get a cleanly indented, readable version. Invalid JSON produces an error with the line and position of the problem.JSON ValidatorCheck whether a JSON document is valid. Errors are reported with line and column, plus a plain-English explanation of the likely cause.JSON to CSVConvert a JSON array of objects into CSV that opens cleanly in Excel or Google Sheets, with correct quoting and a stable column order.