JSON Minifier
Minify JSON in your browser. Strip whitespace and validate — files stay on your device.
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Removes whitespace and validates JSON locally.
Paste or drop .json
Nothing leaves this device. No account required.
Compress JSON without uploading
Minifying strips insignificant whitespace and produces a single-line string. Invalid JSON is rejected with a clear error and line/column when available. Copy the result or download a .json file — processing stays on your device.
Prefer readable output? Open the JSON Formatter. Need to rename keys as well as strip whitespace? Use JSON Uglify — minify keeps original property names; uglify does not.