Developer Tools
JSON Minifier
Validate and compress JSON into a single line, with exact before/after byte counts and an optional key-sorting step.
Input is validated before minifying, so invalid JSON never passes silently. Runs locally.
Minify for the Wire, Never for the Working Copy
Whitespace removal typically saves 20–40% on pretty-printed JSON, which matters for API payloads, config shipped to browsers, and anything metered by transfer. But minified JSON ends the file editability: the working copy with indentation stays the source of truth, and minification is a build/deploy step — hand-editing minified JSON is how stray commas and lost brackets happen. Validating before minifying catches the trailing comma that minifiers will happily preserve and parsers will reject.
What Minification Removes
- Paste your formatted JSON — the tool validates it before minifying so invalid input never passes silently.
- Enable key sorting if you want deterministic output for version control or caching.
- The minifier strips all insignificant whitespace between tokens.
- Exact original and minified byte sizes are shown so you can quantify the saving.
Example Input & Output
Common Questions
Does minifying change the data?
No. Whitespace between tokens is not part of the data. With key sorting off, even the key order is preserved.
What happens with invalid JSON?
The tool reports the syntax error instead of producing a broken output, so you fix the source first.
Related Developer Tools
JSON Formatter & Validator
Professional developer utility to format, validate, and minify JSON with precise line/column syntax error detection and payload size statistics.
JSON Diff Checker
Compare two JSON objects or arrays and get a clear, path-addressed report of added, removed, and changed values.
CSS Formatter & Minifier
Format or minify CSS stylesheets in your browser with payload reduction statistics and zero server processing.