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How to use JSON Flattener

Paste nested JSON and it is collapsed into one flat object where each key is the full dot-notation path to its value.

Frequently asked questions

What does flattening produce?

A single-level object whose keys are paths like user.address.city, each mapping to the original leaf value.

How are arrays flattened?

Array items use bracket or dotted index notation, such as items.0.name, so every element remains addressable.

Can I reverse it?

Yes — use the JSON Unflattener to expand dot-notation keys back into nested objects.

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