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JSON Flatten Pro — Flatten to Dot-Notation, or Unflatten Back

Flatten a deeply nested JSON object into a single level of dot-notation keys (address.city, address.zip) — useful for spreadsheet export or systems that only handle flat key-value data — or reverse the operation, reconstructing nested structure from a flattened object.

How to use JSON Flatten Pro

1. Paste your JSON.
2. Choose flatten or unflatten.
3. Copy the transformed result.

Frequently asked questions

Why would I need to flatten JSON?

Some systems (spreadsheet exports, certain analytics tools, flat key-value stores) cannot represent nested structure directly, so flattening into dot-notation keys is the standard workaround.

Does unflatten perfectly reconstruct the original?

Yes, provided the dot-notation keys are unambiguous — unflatten reconstructs the same nested structure the flatten operation would have produced from it.

How are arrays handled when flattening?

Array items are typically flattened using indexed keys (items.0.name, items.1.name), preserving order and position.

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