bundles/org.eclipse.wst.json.npm.core/plugin.xml

<?json version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin>

	<extension point="org.eclipse.core.contenttype.contentTypes">

		<content-type
		    file-names="package.json"
			priority="high"
			name="%NPM_Content_Type_Extension_Element.name"
			id="org.eclipse.wst.json.npm.core.npmsource"
			base-type="org.eclipse.wst.json.core.jsonsource">
		</content-type>

	</extension>

</plugin>