JSON ↔ CSV
Convert JSON arrays to CSV and CSV back to JSON, with flattened nested keys.
JSON
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CSV
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How it works
- Drop a file into the upload area, or paste your content into the input box.
- Choose the output format and options, then start the conversion.
- Download the result — everything runs in your browser and nothing is uploaded.
Frequently asked questions
How do nested objects and arrays become columns?
Nested objects are flattened into dot paths (like user.name); arrays become a JSON string in one cell. The CSV is UTF-8 with comma separators.
Do my files get uploaded to a server?
No. All 12 tools run inside your browser, so files never leave your device. Closing the tab ends the session.