Is CSV to JSON Converter free to use?

Yes. CSV to JSON Converter is free, has no usage cap and does not require an account. There is no paid tier that unlocks extra output.

Does my data get uploaded to a server?

No. The tool is a JavaScript function that runs inside your browser tab. Nothing you paste or drop in is transmitted, logged or stored by us.

Do I need to create an account?

No account, no email address and no sign-in. Open the page and start working.

Does it work on a phone or tablet?

Yes. The interface is responsive and works in mobile Chrome, Safari, Edge, Firefox and Samsung Internet. You can also install Toolspea as an app from the browser menu.

Can I use the output commercially?

Yes. You keep every right you already had over the input, and we claim nothing over the output.

What happens to commas inside a field?

Fields wrapped in double quotes are parsed as a single value, so "Smith, Ava" stays intact. Escaped quotes inside a quoted field are also supported.

Why did my ZIP code lose its leading zero?

Because numeric coercion turned 02134 into 2134. Turn off 'convert numeric strings to numbers' to keep identifiers, phone numbers and postal codes as strings.

Can it handle a large export?

Files of a few megabytes convert without trouble. Very large exports are limited by browser memory; split them first with a spreadsheet or a shell command.

Developer tools

CSV to JSON Converter

Convert delimited spreadsheet data into an array of JSON objects.

CSV data (first row is treated as headers)

Result

Options

Delimiter

Convert numeric strings to numbers

Pretty-print output

Everything above is processed in this browser tab. Your input is never sent to a server.

What is CSV to JSON Converter?

CSV to JSON Converter parses comma or tab separated data and returns an array of JSON objects keyed by the header row. It is used to move exported spreadsheet data into an API request, a seed file or a front-end fixture without writing a parsing script.

How to use it

1Paste the CSV, including its header row.
2Select the delimiter your export uses — European exports often use semicolons.
3Choose whether numeric-looking values become JSON numbers.
4Copy the resulting array of objects.

Features

Quoted fields containing the delimiter are parsed correctly
Optional type coercion for numbers and booleans
Handles both LF and CRLF line endings

When people use it

Seeding a database

Turn a client-supplied spreadsheet into the JSON payload your import script expects.

Prototyping with real data

Drop a converted export into a front-end fixture so components are tested against realistic values rather than invented ones.

Known limits

Deeply nested structures cannot be expressed in flat CSV; the output is always a flat array of objects.