Convert CSV to JSON
Convert CSV files to clean, structured JSON
CSV Input
Try a sample:
Drop a CSV file here or
Only the first file is used if multiple are dropped.
The request is made directly from your browser. No proxy is used.
JSON
JSON output will appear here...
Options
CSV Format
Conversion
JSON Output
How to Use This Tool
This tool converts CSV data into clean, structured JSON directly in your browser. No data is uploaded or sent to any server.
You can provide CSV input in three ways: paste it directly, upload a file, or fetch it from a URL. The JSON output updates in real time as you change parsing or formatting options.
- Provide your CSV — Paste CSV text into the input area, drop a CSV file onto the File tab, or enter a URL on the URL tab to fetch remote data.
- Configure options — Open the Options panel to adjust CSV parsing settings (delimiter, quote character, headers, dynamic types) and choose your JSON indentation style (2-space, tab, or minified).
- Get your JSON — Copy the JSON output to your clipboard or save it as a .json file using the buttons above the output preview.
FAQ
4 questionsDoes this CSV to JSON converter upload my data?
No. The converter runs entirely in your browser using JavaScript. Your CSV data is never sent to a server — there are no uploads, no network requests, and no tracking. Open your browser's network tab to verify.
Why does JSON output change when I toggle dynamic types?
With dynamic types off, every value is treated as a string. With dynamic types on, the parser automatically converts values that look like numbers or booleans into their native JSON types. For example, the string "42" becomes the number 42, and "true" becomes the boolean true.
What happens if my CSV has inconsistent rows?
The tool will still produce JSON output and display parse warnings for any rows that don't match the expected column count. Short rows get empty values for the missing columns, so you can inspect the output and decide how to handle them.
Can I fetch CSV from any URL?
Browser CORS rules apply, so some URLs cannot be fetched directly. If a server doesn't allow cross-origin requests, you'll see an error message. In those cases, download the file first and use the File tab instead.