CSV ↔ JSON Converter

How do I convert CSV to JSON online?

Paste your CSV with the first row as column headers, select CSV → JSON mode, and click Convert. The tool maps each column to a key in the JSON objects and automatically converts numbers, booleans, and empty cells to the correct JSON types.

Does CSV to JSON auto-detect data types?

Yes. Numbers like 42 or 3.14 are converted to JSON numbers instead of strings, 'true' and 'false' become JSON booleans, and empty cells become null. This saves you from manually casting types after loading the JSON in your code.

What JSON format does JSON to CSV require?

The input must be a JSON array of objects, e.g. [{"name": "Alice"}, {"name": "Bob"}]. Each object's keys become column headers. If different objects have different keys, all keys across all objects are used as headers and missing values produce empty cells.

How are commas inside CSV field values handled?

Fields containing commas, double-quotes, or newlines must be wrapped in double-quote characters in the CSV (RFC 4180 standard). This tool correctly parses such quoted fields. When exporting JSON to CSV, values containing commas are automatically quoted in the output.

Is there a row or file size limit?

There is no enforced row limit. Processing happens in memory in your browser, so performance depends on your device. The tool handles thousands of rows comfortably for typical use cases like API responses, database exports, or spreadsheet data.

Is my CSV or JSON data uploaded to a server?

No. All conversion logic runs locally in your browser using JavaScript. Your data never leaves your device — making this safe for sensitive records like customer lists, financial exports, or internal database dumps.