CSV ↔ JSON Converter
Convert CSV to JSON and back. Auto-detects delimiters, handles quoted fields and multi-line cells. Numbers and booleans are auto-typed (toggleable).
Convert CSV to JSON or JSON to CSV in either direction, with automatic delimiter detection. Perfect for moving data between spreadsheets, APIs and code — all converted locally, nothing uploaded.
Delimiters (, ; tab) auto-detected; conversion runs entirely in your browser.
How to use the CSV to JSON Converter
- Paste your CSV or JSON data.
- Pick the conversion direction.
- Copy the result, ready for your spreadsheet, API or codebase.
Frequently asked questions
How do I convert CSV to JSON?
Paste CSV text and click Convert to JSON. The tool auto-detects commas, semicolons and tabs.
How do I convert JSON to CSV?
Paste a JSON array of objects and click Convert to CSV to get a header row plus data rows.
What if my CSV uses semicolons?
Delimiters are detected automatically, so semicolon-separated and tab-separated files convert cleanly.
Can it handle nested JSON?
Flat arrays of objects convert perfectly. Deeply nested structures are flattened to dot notation where possible.