Does the first row need to be headers?

Yes. The first row is treated as property names for the JSON objects. Make sure your CSV has a header row.

Are numbers automatically parsed?

Yes. Values that look like numbers are converted to JSON numbers. Everything else stays as a string.

What delimiter does it support?

Commas by default. If your file uses semicolons or tabs, paste the data and it will be detected automatically.

Is this processed in the browser?

Yes — entirely. No data is uploaded to any server. The conversion is instant and private.

CSV to JSON

Convert CSV files to JSON format online for free.

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Frequently asked questions

Convert CSV to JSON Online Free — Spreadsheet Data to JSON Array

Working with data exported from Excel, Google Sheets, or a database? Our CSV to JSON converter turns your comma-separated data into a structured JSON array of objects, using the first row as property names. Paste the CSV text or upload a file and get properly formatted JSON output you can use directly in your code or API.

Header row as keys

The first row of your CSV becomes the property names in each JSON object. Numbers are automatically parsed.

Handles quoted fields

Fields containing commas, quotes, or line breaks are parsed correctly following the RFC 4180 CSV standard.

Private & instant

Processing is done in your browser. Your data is never sent to a server — completely private.

Import spreadsheet data into your application, prepare data for an API, or convert an export from any business tool into developer-friendly JSON. Handles files of any size instantly.