JSON Unflattener

Convert flattened $["key"][0] paths back into nested objects and arrays locally.

Flat path object

Nested JSON

ReadyInput keys must use the reversible bracket paths produced by the WebToolArc JSON Flattener.

How to use this JSON Unflattener

Rebuild nested JSON from WebToolArc bracket-path keys. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.