CSV to JSON Converter
Drag a CSV file here or choose one
Files are not uploaded to a server.
CSV input
JSON result
0 rows
No fields
No conversion result yet.
Q. Are CSV files uploaded to a server?
No. File reading and JSON conversion run inside your browser. CSV content and converted JSON are not sent to Yioo servers.
Q. What does the first-row-as-field-names option do?
When enabled, the first CSV row becomes object keys and the result is an array of JSON objects. When disabled, each CSV row stays as an array.
Q. Can it convert large CSV files?
There is no server-side limit, but the browser uses local memory. Very large CSV files or files with many rows may become slow depending on your device.
Q. When should I use this tool?
Use it when you need to turn spreadsheet exports or CSV data into JSON for API tests, configuration files, or development sample data. Review readable output with pretty printing, then use Compact before copying when you need whitespace-free JSON.