About This Tool

This converter was built for developers, data analysts, and anyone who regularly moves data between JSON and CSV formats. It handles the edge cases that trip up simpler tools — nested objects, quoted fields, mixed types, and large datasets.

100% Client-Side

All conversion happens in your browser. No data is uploaded to any server. There is no backend, no database, and no logging. Your data stays on your device.

JSON → CSV Features

• Accepts arrays of objects or single objects
• Flattens nested objects with dot notation (e.g., address.city)
• Handles arrays within objects (joined as comma-separated values)
• Properly escapes fields containing delimiters, quotes, or newlines
• Configurable delimiter: comma, tab, semicolon, or pipe
• Optional header row

CSV → JSON Features

• RFC 4180 compliant CSV parsing
• Handles quoted fields with escaped quotes
• Handles newlines within quoted fields
• Auto-detects types: numbers, booleans, nulls (empty fields), and strings
• Supports multiple delimiters
• Outputs pretty-printed JSON

The "Use as Input" Button

After converting, click "Use as input ↺" to feed the output back as input in the opposite direction. This lets you chain conversions or round-trip your data to verify accuracy.

Contact

Questions or feedback? Reach us at the feedback link in the navigation.