Convert between CSV and JSON formats easily

CSV/JSON Converter

Convert between CSV and JSON formats with support for nested data

CSV Input

Delimiter:

Convert between CSV and JSON formats instantly. Upload CSV files or paste data to get JSON arrays, or convert JSON arrays to CSV for spreadsheet use. Our converter handles headers, custom delimiters, and large datasets—all processing in your browser.

How to Use

1Select conversion direction: CSV to JSON or JSON to CSV
2Paste your data or upload a file
3Configure delimiter (comma, semicolon, tab) for CSV
4Click Convert to transform your data
5Copy the result or download as a file

Frequently Asked Questions

What CSV format is supported?

We support standard RFC 4180 CSV: comma-separated, with optional quotes around fields containing special characters. You can also select semicolon or tab delimiters for regional variants.

Can I convert nested JSON to CSV?

Flat JSON arrays convert directly. For nested objects, our tool flattens them using dot notation (e.g., 'address.city'). Very deeply nested structures may need pre-processing for clean CSV output.

Is there a size limit?

Browser-based processing handles files up to ~50MB comfortably. Larger files may cause slow performance or memory issues. For very large datasets, consider command-line tools.

CSV/JSON Converter