What does JSON ↔ CSV actually do?

JSON ↔ CSV turns an array of flat objects into a table, or a headered CSV back into objects. Nested objects do not become extra columns by themselves. Cells are text; numbers and booleans are not retyped with guarantees on the way back.

Does conversion upload my dataset?

No. JSON/CSV conversion runs in your browser.

What JSON shape works best?

An array of flat objects maps cleanly to CSV columns. Deeply nested structures may need flattening first.

JSON ↔ CSV

Convert JSON arrays to CSV and back, with header detection. Free online — runs locally, no upload.

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JSON ↔ CSV