CSV to JSON Converter Online

Free online CSV to JSON converter: turn comma-separated data into a pretty-printed JSON array. Rust + WebAssembly, 100% in your browser.

Loading WebAssembly engine…

Use it in your terminal (or let an AI agent run it)

This tool also ships as a command-line version in the wasm-tools-cli npm package — the exact same engine as this page, running locally on your machine.

cat data.csv | npx wasm-tools-cli csv2json convert

About CSV to JSON Converter

CSV to JSON Converter is a free online data tool that runs entirely in your browser. There is nothing to install and no account to create: open the page, use the tool, and download the result. Because all processing happens locally on your device (via WebAssembly), your files and text are never uploaded to any server.

How to use CSV to JSON Converter

Paste or type your content into the input box.
Choose the operation (and any options) and click the corresponding button.
Copy the result or download it as a file.

Frequently asked questions

Is CSV to JSON Converter really free?

Yes — CSV to JSON Converter is completely free, with no account, no watermark, and no usage limits. It runs entirely in your browser.

Are my files uploaded to a server?

No. All processing happens locally on your device using WebAssembly. Your files never leave your computer — close the tab and nothing remains.

Which browsers are supported?

Any modern browser on desktop or mobile: Chrome, Firefox, Safari, and Edge.

CSV to JSON Converter Online

Use it in your terminal (or let an AI agent run it)

About CSV to JSON Converter

How to use CSV to JSON Converter

Frequently asked questions

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