CSV to JSON

Paste your CSV data or upload a file, adjust parsing options if needed, and instantly get JSON output.

Yes, you can upload a .csv file and it will be automatically parsed into JSON.

When enabled, the first row is used as JSON keys. When disabled, rows are returned as arrays.

It automatically converts values like numbers and booleans from strings into proper data types.

Yes, you can specify a custom separator such as comma, tab, or semicolon.

Yes, performance depends on your browser and device, but most modern systems handle large files smoothly.

Yes, it is completely free with no limits or sign-up required.

No, all parsing happens locally in your browser for maximum privacy.

Yes, you can download the formatted JSON file with a custom filename.

It includes additional parsing details like errors, delimiter info, and row counts along with the data.

Yes, the CSV to JSON is fully functional offline. Because this tool runs entirely in your browser, no data is ever uploaded to external servers. Once the page is loaded, you can seamlessly continue using it without an active internet connection. You can also install Knicknaks as a Progressive Web App (PWA) for native-like offline access.