CSV to JSON Converter
Convert CSV to a JSON list of objects, with numbers detected.
Runs on your device · no upload
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About CSV to JSON Converter
CSV to JSON turns spreadsheet data into a JSON list of objects for APIs and code. The first row becomes the keys, numbers and true or false become real JSON values, and leading zeros stay as text. Nothing is sent anywhere.
Paste your input
Everything runs in your browser. Nothing is sent anywhere.
Get the result
Copy it with one tap.
Download
Save the result. No watermark, no sign-up.
Frequently asked questions
How are the keys chosen?
From the first row. Empty or repeated headers are given unique names.
Are numbers converted?
Yes, if the option is ticked. Values like 007 and very long numbers stay as text so that codes are not changed.
Can I paste instead of adding a file?
Yes. Paste CSV into the box or add a file.
Is the JSON pretty printed?
By default. Untick Pretty print for a compact result.
Are my files uploaded anywhere?
No. This tool runs in your browser, so your file stays on your device and is never sent to a server.