JSON Minifier

Remove every optional space and line break from your JSON, and see exactly how many bytes that saved.

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Minifying removes whitespace that JSON does not need: the spaces after colons and commas, the indentation, and the line breaks. Nothing else changes. The values, their order and their exact text are identical, so minifying and formatting are safe to do as often as you like. Because this works on the token stream rather than parsing your document into a JavaScript value, long integers keep every digit and keys that look like numbers keep the order you gave them.

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Paste your JSON into the input pane, or load the sample.
Press Minify. The result appears on the right.
Check the saving, then copy the result or download it as a file.

Domande frequenti

Does minifying change my data?

No. Only whitespace between values is removed. Every key, every value, their order and their exact text stay the same, which is why you can minify and format the same document back and forth without ever losing anything. If you minify and then format again, you get your original document back with standard indentation.

How much smaller will my JSON get?

It depends entirely on how the document was written. A file that was already compact saves almost nothing, while a deeply nested document indented with four spaces can lose a large share of its size, because indentation grows with depth. The saving is shown for your actual document as soon as you press Minify, so you do not have to guess.

Should I minify JSON before sending it over a network?

It helps, but usually far less than enabling compression. Gzip and Brotli already collapse repeated whitespace very effectively, so on a compressed connection the difference between minified and formatted JSON is much smaller than the raw byte counts suggest. Minifying is most worth it where responses are not compressed, or where the JSON is stored rather than transferred.

JSON Minifier

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