JSON Unflattener
Rebuild nested JSON from dot-notation keys.
Dot keys back to nested JSON
The inverse of flattening: this reads keys like "a.b.c" and rebuilds the nested object they describe, so a flattened export or spreadsheet row becomes structured JSON again.
It rebuilds structure after a spreadsheet round-trip: edit flattened dot-notation keys in a sheet, then unflatten them back into the nested JSON your application expects.
Pairs with the flattener
Use the same dot convention both directions. The rebuild runs entirely in your browser with nothing uploaded. Your data is rebuilt on your device and never uploaded.
Frequently Asked Questions
What does this json unflattener do?
Rebuild nested JSON objects from flat dot-notation keys.
Can I use this with private work data?
Yes. The tool runs entirely in your browser, so pasted data is not uploaded, logged, or stored by Bushe.co.
What should I check before using the output?
Review the preview or output for delimiter issues, unexpected blank rows, and field names that may need cleanup before importing elsewhere.
Is this tool free?
Yes. It is free to use and does not require an account.
More free browser utilities for data cleanup, formatting, and developer workflows.