CSV ⇄ JSON converter
Turn CSV into JSON objects using the header row, or flatten JSON into CSV columns. Your data stays in this tab.
Runs in your browser. Your files are never uploaded or stored.
Something not working, or missing an option?
How to use CSV ⇄ JSON converter
- Paste CSV or JSON, or open a file.
- Choose the direction and options.
- Copy or download the result.
Questions
How is nested JSON turned into columns?
Nested objects become columns like address.city; lists are written as JSON inside the cell.
Are my files uploaded?
No. The tool runs inside your browser, and the page is blocked from sending data anywhere. You can check by turning off your internet connection: it keeps working.
Open-source parts
This tool uses only features built into your browser: no third-party code.