1. Load json

Click on "load" button and load a json-string to opened form

2. Expand/collapse single nodes

By click on properties names (recursively - by CTRL/META + click)

3. Expand/collapse all tree nodes

By click on "expand all" and "collapse all" buttons

4. Mark/unmark node labels

By click on label with pressed ALT key

5. Show JSONPath of node

By click on label with pressed SHIFT key