Drag & drop to install
Drag & drop this extension right into the Workflow Editor of KNIME Analytics Platform (4.x or higher).
Learn moreExtension 
KNIME JSON-Processing
This feature contains several node for reading, manipulating,
and writing XML data.
Legal
Copyright by KNIME AG, Zurich, Switzerland
Update site information
KNIME Analytics Platform 4.2 Update Site, Version 4.2.0
http://update.knime.com/analytics-platform/4.2
In case you can’t install the extension via drag & drop, please check that the update site is activated.