JSON→CSV変換ツール
JSON配列をCSV形式に変換してダウンロード
次に進む
関連する次のアクションでワークフローを続けます。
Privacy & Trust
Browser-side conversion
The source JSON stays in the browser during conversion, which is safer for sample records, fixtures, and internal datasets.
Flat objects work best
Each array element should be a plain object. Nested objects are stringified into a single CSV cell instead of being flattened automatically.
Headers come from keys
The converter merges keys across the full array so missing properties become empty cells instead of dropping columns.
Export CSV
Convert valid JSON first to enable export.
使い方
テキストを貼り付けまたは入力
テキスト、コード、またはデータを入力エリアに入力します。
オプションを選択
適用する変換やフォーマットを選択します。
結果をコピー
ワンクリックで出力をクリップボードにコピーします。
このツールを使う理由
完全無料
隠れたコストもプレミアムプランもありません — すべての機能が無料です。
インストール不要
すべてブラウザで実行されます。ソフトウェアのダウンロードやインストールは不要です。
プライベート＆安全
データはデバイスの外に出ることはありません。サーバーにアップロードされることはありません。
モバイル対応
完全レスポンシブ対応 — スマートフォン、タブレット、デスクトップで利用できます。
JSON to CSV Conversion for Data Analysis and Reporting
Key Takeaways
- CSV is the universal format for importing data into spreadsheets, databases, and data analysis tools like Excel and Google Sheets.
- Converting JSON to CSV requires flattening nested objects and arrays into a two-dimensional tabular structure.
- All conversion is performed in your browser — your data never leaves your device.
JSON is the standard format for API responses and web data, but business users, analysts, and reporting tools typically work with tabular CSV data. Converting JSON arrays of objects into CSV enables data to flow seamlessly from APIs into spreadsheets, BI tools, and database import workflows. The challenge lies in properly flattening nested JSON structures into flat rows and columns.
CSV remains the most widely supported data import format across all major spreadsheet and database applications.
Universal Compatibility
Common Use Cases
API Data Export
Convert JSON responses from REST APIs into CSV files for analysis in Excel, Google Sheets, or Tableau.
Database Migration
Transform JSON documents from NoSQL databases (MongoDB, Firestore) into CSV for import into relational databases.
Report Generation
Convert structured JSON data into CSV format for business reports, client deliverables, and stakeholder presentations.
Data Pipeline Integration
Prepare JSON data in CSV format for ETL (Extract, Transform, Load) pipelines that expect tabular input.
Pro Tips
Flatten nested JSON objects using dot notation (address.city, address.zip) before conversion to preserve data relationships.
Handle arrays within JSON objects by either joining values with a delimiter or creating separate rows for each array element.
Always quote CSV fields that contain commas, newlines, or double quotes to prevent parsing errors in spreadsheet applications.
Include a BOM (Byte Order Mark) character at the start of CSV files to ensure Excel correctly recognizes UTF-8 encoding.
All JSON to CSV conversion is performed entirely in your browser. Your data, which may contain sensitive business information, is never transmitted to any external server.