Skip to content
littlekit.app
All tools

Unflatten JSON

Restore nested JSON from explicit path records and explore the reconstructed structure.

Source
222 / 1,000,000 charactersLocal only
Restored structure
5Values
2Depth
objectRoot type
Explore the document
Restored value preview
{
  "user": {
    "name": "Ada"
  },
  "tags": [],
  "empty": {}
}

Select branches to inspect the restored data. Export always saves the complete restored document.

Processed on your device

How it works & useful details

How it works

Restore records produced by JSON flatten. Include an empty-path root record and explicit parent containers. Value records need a primitive value; container records have only path and kind. Duplicate paths, missing parents, sparse arrays and invalid escapes are rejected. Record order may vary. Up to 10,000 records.

Limits & privacy

Up to 1,000,000 characters, 50,000 values and 64 levels. Live previews pause above 40,000 characters; run the tool to process the full supported input. Imported files must be UTF-8 and under 1 MB. Your data stays on this device.

Numbers use JavaScript decimal precision. Unsupported large integers are rejected; quote identifiers to keep all digits. Duplicate object names keep their last value. Transforms preserve data, not source whitespace or number spelling.

Paths use JSON Pointer: an empty path selects the root, ~0 escapes a tilde, and ~1 escapes a slash.