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JSON to CSV Converter

Convert JSON arrays to CSV with nested flattening, delimiter options, and header toggle

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📄 JSON 入力
📋 CSV 出力

About JSON to CSV Converter

The JSON to CSV Converter is an online tool for quickly converting JSON array data into CSV (Comma-Separated Values) format. It is ideal when you need to transform JSON data from API responses or databases into a CSV format that can be opened in Excel or spreadsheet applications.

Nested objects are automatically flattened using dot notation (e.g., user.name, address.city), allowing you to handle complex JSON structures with ease. Arrays can be handled flexibly: converted to JSON strings, joined with a separator, or skipped entirely. Column order is preserved from the first object, ensuring data consistency and predictability.

The number parsing feature automatically converts numeric strings to numbers, ensuring accurate calculations in Excel. You can choose between comma, tab (TSV), and semicolon delimiters, toggle header row output, and optionally quote all values. All conversion happens in your browser — no data is ever sent to a server.

How to use JSON to CSV Converter

  1. Paste your JSON array data into the left textarea, or click the 'Sample' button to load sample data. Format: [{ key: value, ... }, { key: value, ... }]
  2. Configure options as needed: delimiter (comma/tab/semicolon), header toggle, nested flattening, array handling (stringify/join/skip), number parsing, and quote-all mode
  3. The CSV result appears in real time on the right. Click 'Copy' to copy to clipboard or 'Download' to save as CSV/TSV file

Benefits of JSON to CSV Converter

  • Automatically flattens nested JSON objects using dot notation, handling complex data structures effortlessly. Column order is preserved from the first object
  • Three array handling modes available (stringify, join with separator, or skip) for flexible data processing
  • Automatic number parsing converts numeric strings from APIs to true numbers, ensuring accurate Excel calculations
  • All processing runs in your browser, so you can safely convert sensitive data and API responses without worry
  • Real-time preview lets you see results instantly and test different option combinations on the fly

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