CSV ⇄ JSON Converter

Convert CSV data to a JSON array of objects, or flatten JSON back into CSV. Quoted fields and embedded commas are handled correctly, and your data never leaves the browser.

Runs locally — nothing you enter is sent Developer Free · no signup

How to use

Paste CSV (or JSON) into the input panel, or start from the loaded sample.
Choose the conversion direction: CSV → JSON or JSON → CSV.
Adjust options such as the delimiter and whether the first row is a header.
Copy or download the converted output from the right-hand panel.

Examples

CSV in

name,role
Ada,Engineer
Grace,Admiral

JSON out

[{"name":"Ada","role":"Engineer"},{"name":"Grace","role":"Admiral"}]

Supported formats

CSV input: comma, semicolon or tab delimited; quoted fields with embedded delimiters and newlines are supported.
JSON input for the reverse direction: an array of flat objects.

Privacy

This tool runs entirely in your browser. Nothing you enter or open is sent anywhere. Privacy policy.

Limitations

Deeply nested JSON is not flattened into dotted column names — only flat objects convert cleanly to CSV.
Very large files (tens of MB) are limited by browser memory since the whole text is processed at once.

FAQ

Is my data uploaded to a server?

No. The conversion runs entirely in your browser, so the tool is safe for sensitive exports.

How are commas inside values handled?

Fields wrapped in double quotes are parsed per RFC 4180, so embedded commas, quotes and newlines survive the round trip.

Can I convert JSON back to CSV?

Yes — paste a JSON array of objects and switch the direction. Object keys become the header row.