● Presend All tools API

オンラインで JSON を CSV に変換 (およびその逆) - アップロードは必要ありません

Developers, analysts and no-code builders switch between JSON and CSV dozens of times a week. Do it instantly in your browser without uploading anything.

Try the JSON ↔ CSV Converter →
Nothing is uploaded — runs entirely in your browser

JSON を CSV に変換する理由

JSON is the native language of APIs and modern databases. CSV is the universal format for spreadsheets, email imports and legacy systems. Moving between the two is a daily need for anyone who works with data.

私のデータは安全ですか?

Yes. The conversion runs entirely in your browser using JavaScript. Your JSON or CSV never touches a server, never gets logged, and disappears the moment you close the tab. Perfect for sensitive customer or business data.

何を変換できますか?

Paste an array of objects to get a clean CSV with headers. Paste a CSV to get a formatted JSON array. The tool handles quoted fields, commas inside values, and nested structures gracefully.

Ready to convert your data?

Free, instant, and 100% private. No account needed.

Open JSON ↔ CSV Converter →

ブラウザベースのユーティリティ ツールを使用する理由は何ですか?

Online utilities like password generators, text formatters, and URL cleaners are convenient, but most send your data to remote servers. Our browser-based tools process everything locally — your passwords, text, and URLs never leave your device.

This is especially important for sensitive operations like generating passwords, checking password strength, or cleaning URLs that contain tracking parameters. With Presend, you get the convenience of online tools with the security of offline software.

当社のユーティリティツールがあなたのプライバシーをどのように保護するか

  1. All processing happens in your browser using JavaScript
  2. No data is transmitted to external servers
  3. No cookies or tracking scripts monitor your usage
  4. Your input data is cleared when you close the tab

当社のユーティリティ ツールを使用すると何ができるでしょうか?

Generate cryptographically secure passwords, check password strength against entropy analysis, convert between JSON and CSV formats, compare text differences, split long text into social media threads, clean tracking parameters from URLs, validate email lists, check color contrast for accessibility, and convert images to Base64 for embedding.

これらのツールは本当に無料ですか?

Yes — all our utility tools are completely free to use, with no registration required, no usage limits, and no watermarks. We believe privacy tools should be accessible to everyone, not locked behind paywalls or subscription models.