CSV → JSON オンラインコンバーター

Free 無料 · ログイン不要 · データ保存なし
Delimiter
Types
Output
Error
CSV
JSON
// JSON output

その他の開発ツール

CSV フォーマッター
整形・検証
JSON→CSV
CSV に変換
YAML→JSON
JSON に変換
XML→JSON
JSON に変換
TOML→JSON
JSON に変換
JSON フォーマッター
整形・検証・圧縮
正規表現
リアルタイムテスト
URL エンコード
パーセント変換

なぜこれが最高のCSV→JSONコンバーターなのか

ヘッダー自動検出

The first row is automatically used as JSON keys. Each subsequent row becomes a JSON object in the output array.

スマートな型推論

Numbers, booleans (true/false), and null values are automatically inferred. Disable type inference to keep all values as strings.

カスタム区切り文字

Supports comma, semicolon, tab, and pipe delimiters. Perfect for European-style CSVs that use semicolons, or TSV files.

JSONダウンロード

Export the converted result as a .json file ready for use in any API, database import, or application.

よくある質問

How do I convert CSV to JSON?

Paste your CSV text into the input field and click Convert. The first row is treated as the header and becomes the JSON keys. Each subsequent row becomes an object in the JSON array.

Does it handle quoted fields with commas inside?

Yes. The parser fully supports RFC 4180 CSV, including fields wrapped in double quotes that contain the delimiter character, commas, or newlines.

What if my CSV has no header row?

The tool assumes the first row contains headers. If your data has no headers, add a header row with column names (e.g. col1,col2,col3) before pasting.

詳細ガイド
データ形式変換ガイド
CSV・XML・JSON・HTML・Markdown
ガイドを読む