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JSON Minifier
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Minify and compress JSON online
This JSON minifier strips every unnecessary space, tab and line break from your JSON while keeping it perfectly valid. The result is the smallest possible representation of the same data - ideal for API payloads, config embedded in query strings, localStorage values and anywhere bytes matter. The tool also shows you the before/after size and the percentage saved.
Why minify JSON?
- Smaller payloads - pretty-printed JSON can be 20–40% larger than minified JSON. Less data means faster API responses and lower bandwidth bills.
- Faster parsing - smaller strings download and parse quicker, especially on mobile networks.
- Cleaner embedding - one-line JSON fits neatly into environment variables, HTML data attributes and shell commands.
How it works
The minifier parses your input with the browser's native JSON.parse and re-serializes it withJSON.stringify without an indentation argument. That guarantees the output is valid JSON - it is not a naive whitespace stripper that could corrupt strings containing spaces. Because parsing happens locally in JavaScript, your data never leaves the browser.
Need to go the other way? The JSON formatter pretty-prints minified JSON, and the JSON validator pinpoints syntax errors before you compress.