CSVからJSONへの変換
無料のCSVからJSONへの変換ツールです。ヘッダー行を含むCSVを貼り付けると、クリーンなオブジェクトのJSON配列が生成されます。数値や型を自動検出します。ブラウザで実行されます。
Runs in your browserUpdated Apr 26, 2026
CSV Input
JSON Output
⌘⇧C
よくある質問
›Does my header row need quotes?
Optional. We handle both quoted and unquoted headers, with comma or tab delimiters.
›Are numbers auto-detected?
Yes. If a value parses as a number, it becomes a JSON number; otherwise it stays a string. Booleans (true/false) are also detected.
›What delimiter is used?
Comma is default. Tab and semicolon are auto-detected from the first line.
›Is my CSV uploaded?
No — conversion runs entirely in your browser.
›Is the converter free?
Yes — fully free, no signup.