JSON Unflattener
Rebuild nested JSON from flat dot-notation keys.
Runs locally · Nothing uploaded
Flat JSON
Nested JSON
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About JSON Unflattener
Takes a flat object with keys like "user.address.city" or "items[0].id" and reconstructs the original nested structure of objects and arrays. It is the exact inverse of the JSON Flattener. Useful for turning spreadsheet columns or env-style keys back into structured config.
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