CSV to JSON Converter

CSV input

Load .csv file Delimiter First row is header Convert numbers & true/false Pretty-print

JSON output

How to Convert CSV to JSON

Three steps, all in your browser.

Paste or load your CSV

Paste CSV text into the box, or click “Load .csv file” to open a spreadsheet export. The tool converts as you type — no button to press.

Pick your options

Keep “First row is header” on for an array of objects, or turn it off for arrays. Leave the delimiter on Auto-detect for commas, semicolons or tabs. Need the reverse or a different format? Try the XML to JSON Converter or the JSON Formatter.

Copy or download

The JSON appears in the output box. Hit Copy JSON to send it to your clipboard, or Download .json to save a file. Nothing is uploaded — it all happens on your device.

Frequently Asked Questions

How do I convert CSV to JSON?

Paste your CSV into the input box, or load a .csv file. The tool converts it to JSON instantly as you type. By default the first row is treated as the header, so each following row becomes a JSON object whose keys are the column names — giving you an array of objects, the shape most APIs and scripts expect. Turn off the header option to get a plain array of arrays instead. Then click Copy JSON or Download .json.

Is my data uploaded anywhere?

No. The conversion runs entirely in your browser with JavaScript. The CSV you paste or the file you load is parsed on your own device and is never sent to a server, logged, or stored. That means you can safely convert private exports, customer lists, or internal data, and the tool keeps working offline once the page has loaded. Closing or refreshing the tab clears everything.

Does it handle commas and line breaks inside quoted fields?

Yes. The parser follows the RFC 4180 CSV rules, so a value wrapped in double quotes can contain commas, line breaks and escaped quotes (written as two double quotes, "") without breaking the columns. This matches how Excel, Google Sheets and most database exports quote their data, so pasted spreadsheet output converts cleanly.

Can I choose the delimiter?

Yes. Leave the delimiter on Auto-detect and the tool inspects the first row to decide between comma, semicolon and tab — semicolons are common in European exports and tabs in TSV files. You can also set the delimiter explicitly if auto-detection guesses wrong for an unusual file.

Are numbers kept as numbers?

By default yes. With “Convert numbers & true/false” enabled, a cell like 42 or 3.14 becomes a JSON number and true/false become JSON booleans, so the output is ready to use in code. Turn the option off to keep every value as a string — useful when leading zeros, phone numbers or ID codes must be preserved exactly as written.

How to Convert CSV to JSON

Paste or load your CSV

Pick your options

Copy or download

Frequently Asked Questions

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