CSV ↔ JSON Converter

Free CSV to JSON Converter — Convert Spreadsheet Data Instantly

CSV files are the universal export format for spreadsheet data — Excel, Google Sheets, database exports, and analytics platforms all produce CSV. But modern web applications, APIs, and JavaScript apps work with JSON. This free CSV to JSON Converter instantly converts CSV data to structured JSON, and converts JSON arrays back to CSV — all in your browser with no uploads or server processing.

Paste CSV data or upload a CSV file to convert to JSON. Configure whether your CSV has a header row (column names), choose your delimiter, and select whether to output a JSON array of objects or a raw array of arrays. The output is pretty-printed for readability.

Common use cases: exporting Google Sheets data to a JSON file for a web app, converting database CSV exports to JSON for API import, transforming analytics data for chart libraries, and converting email list CSVs to JSON for programmatic processing.

CSV Format Details

Header row. The first row typically contains column names. When enabled, each JSON object uses the header values as keys: { name: 'John', age: '30' }.

Custom delimiters. Standard CSV uses commas, but many exports use semicolons (European locale), tabs (TSV), or pipes. Specify your delimiter to handle any format.

Quoted fields. CSV fields containing commas, quotes, or newlines are wrapped in double quotes. The converter handles all standard CSV quoting rules correctly.

Large files. The browser-based converter handles typical CSV files up to tens of thousands of rows. For very large files (millions of rows), command-line tools like jq or csvkit are recommended.

Related Tools

• XML to JSON – Convert XML data to JSON format.
• Diff Checker – Compare two JSON files for differences.
• Comma Separator – Convert lists to comma-separated values.

Frequently Asked Questions