JSON圧縮ツール
JSONデータを圧縮・最小化してファイルサイズを削減します。
Reduce JSON Size
JSON圧縮は不要な空白を削除してファイルサイズを削減します。
プライバシー優先
JSONデータはブラウザ外に送信されません。すべての処理はローカルで行われます。
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Minifying JSON to Shrink File Size
概要
Minifying JSON removes all unnecessary whitespace — spaces, tabs, and line breaks — leaving the smallest valid representation. Smaller JSON transfers faster and uses less bandwidth, which matters for APIs and config files. This tool minifies your JSON instantly in the browser.
使い方（ステップ）
- 1
Paste your JSON
Enter formatted or messy JSON.
- 2
Minify
The tool validates and removes all unnecessary whitespace.
- 3
Copy the compact output
Use the minified JSON wherever size matters.
仕組み
The tool parses your JSON to confirm it is valid, then re-serializes it with no indentation or extra spacing. Because whitespace between tokens is meaningless in JSON, removing it does not change the data — only the size. Parsing first also catches syntax errors, so invalid JSON is flagged rather than silently mangled.
こんなときに使う
Reducing the size of an API response or config payload. Preparing JSON for embedding in code or a query string. Stripping formatting before storing or transmitting data.
よくある質問
No. It only removes whitespace between tokens. The values, keys, and structure are identical — just smaller.