CSV ⇄ JSON Converter
Convert between CSV and JSON with preview, header detection and delimiter support.
About this tool
Data often needs to move between CSV spreadsheets and JSON APIs. This converter handles both directions: paste CSV and get indented JSON, or paste JSON arrays and get clean CSV with configurable delimiters. A live preview shows the result before you copy it.
How to use the CSV ⇄ JSON Converter
- Paste CSV data or a JSON array into the input area
- Choose the conversion direction (CSV → JSON or JSON → CSV)
- Adjust delimiter and header options if needed
- Copy the converted output or download it as a file
Features
- CSV to JSON conversion with object or array output
- JSON array to CSV with custom delimiters
- Header auto-detection for CSV
- Live preview of results
- 100% client-side, no upload
Frequently asked questions
Is this CSV to JSON converter free?
Yes. Convert between CSV and JSON online for free with no signup required.
Can I convert JSON back to CSV?
Yes. The tool supports bidirectional conversion: paste JSON to get CSV, or paste CSV to get JSON.
Does it detect CSV headers automatically?
Yes. The tool auto-detects headers and maps them to JSON keys. You can also configure delimiter options.
Is my data uploaded to a server?
No. All conversion is performed locally in your browser. Your data never leaves your machine.