JSON Minifier
Runs in your browser — your data is never uploaded.
Compress formatted JSON down to a single line with every unnecessary byte of whitespace removed — ideal for API payloads, config embedding, and squeezing data into query strings or environment variables. The input is fully parsed first, so you also get validation for free: invalid JSON is reported with its line and column. Everything runs in your browser.
0 characters · runs entirely in your browser
How to use JSON Minifier
- 1
Paste your formatted or hand-written JSON into the box.
- 2
Click “Minify” — the parser validates it and strips all inter-token whitespace.
- 3
Copy the single-line result, or download it as a .json file.
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Frequently asked questions
How much smaller does JSON get?+
Typically 20–40% for indented documents — every newline and indent byte is removed. Deeply nested, heavily indented JSON shrinks the most. (Whitespace inside string values is always preserved.)
Is minified JSON still valid JSON?+
Yes, completely. Whitespace between tokens has no meaning in JSON — parsers treat minified and pretty-printed versions identically.
Does it validate my JSON?+
Yes. Minifying requires parsing, so syntax errors are caught and reported with line and column before anything is output.
Is my data uploaded?+
No. The whole process runs in your browser — safe for payloads containing keys, tokens, or customer data.