Data tool / CSV
CSV to JSON
Turn spreadsheet-style CSV rows into clean JSON objects without uploading the data.
100% processed in your browser
CSV input
JSON result
Convert CSV rows
The first row becomes JSON field names.
How to use it
- 1 Paste CSV data or open a local CSV file.
- 2 Detect the delimiter automatically or choose one.
- 3 Preview the rows, then copy or download JSON.
Useful for
- Turning spreadsheet exports into API-friendly JSON
- Inspecting CSV records as structured objects
- Preparing local data for development workflows
Good to know
- The first row is always used as field names.
- Blank and duplicate field names are renamed safely.
- Files larger than 10 MB are rejected to protect browser performance.
Questions
CSV to JSON FAQ
Can the tool detect CSV delimiters automatically?
Yes. It detects comma or semicolon delimiters from the header row, and you can override the selection.
How are blank or duplicate CSV headers handled?
Blank headers receive safe column names, and duplicate headers receive numbered suffixes so no field is overwritten.
Is the selected CSV file uploaded?
No. The file is read and converted entirely inside your browser.
Continue locally
Related tools
Keep working with another browser-only tool. Your files and tool inputs stay on your device.