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Tom Utilities

JSON フォーマッター

JSON ツール

設定可能なインデント、エラー強調、ワンクリックコピーで JSON を整形・検証します。

入力

結果

使い方

How to format JSON

Paste or type JSON on the left, then press Format. Everything is processed locally in your browser.

  1. Paste your JSON into the input editor.
  2. Choose the indentation you prefer.
  3. Press Format and copy the result.

よくある質問

Is my JSON uploaded to a server?

No. Formatting runs entirely in your browser with JavaScript, so your data never leaves your device.

Can it detect syntax errors?

Yes. If the JSON is invalid the tool shows the error and the position where parsing failed.