How to use
Paste data on top, pick a direction, then copy the output. JSON side expects an array of objects (a single object is wrapped automatically). CSV side treats the first row as headers.
Note
Nested objects are serialized as JSON strings inside cells. Everything runs locally — no upload.
Frequently asked questions
Nested JSON to CSV?
Nested objects become JSON strings inside their cell, keeping data intact.
CSV with commas inside values?
Fully supported, quoted fields parse correctly both directions.
Numbers become strings?
Numeric-looking CSV values convert to JSON numbers automatically.