CSV / JSON Converter
Convert between CSV and JSON in your browser. Supports header row auto-detection.
Input (CSV)
Output (JSON)
How to Use
変換方向（CSV→JSON / JSON→CSV）を選び、入力エリアにデータを貼り付けて「変換」ボタンを押すと変換結果が表示されます。CSVにヘッダー行がある場合は「ヘッダー行あり」にチェックを入れてください。
How It Works
カンマ区切りの値をパースし、クォートされたフィールド内のカンマも正しく処理します。すべての変換はブラウザ内で完結し、データはサーバーに送信されません。
Related Tools
Character Counter
Count characters, words, lines, and bytes in real-time. Supports full-width characters.
JSON Formatter & Minifier
Format, minify, and validate JSON data in your browser.
Base64 Encode/Decode
Instantly encode and decode Base64 text in your browser. Supports multi-byte characters.
Hash Generator (SHA-256, etc.)
Generate SHA-1/SHA-256/SHA-384/SHA-512 hash values in your browser. Data is never sent to a server.
URL Encode/Decode
Encode and decode URLs in real-time. Supports Japanese URL conversion.
Unix Timestamp Converter
Convert between Unix timestamps and dates. Auto-detects seconds vs. milliseconds.
Text Diff
Compare two texts and highlight added and removed lines. Useful for code review and document comparison.
Regex Tester
Test regex matching and replacement in real-time. Supports group capture inspection.
Cron Expression Generator
Easily generate and edit cron expressions with a GUI. Includes natural language descriptions and execution previews.
QR Code Reader
Read QR codes from image files. Supports JPEG, PNG, GIF, and WebP.