grafana/public/app/partials/edit_json.html

<div ng-controller="JsonEditorCtrl">
	<div class="tabbed-view-header">
		<h2 class="tabbed-view-title">
			JSON
		</h2>

		<button class="tabbed-view-close-btn" ng-click="dismiss()">
			<i class="fa fa-remove"></i>
		</button>
	</div>

	<div class="tabbed-view-body">
		<div class="gf-form">
			<textarea class="gf-form-input" ng-model="json" rows="20" spellcheck="false"></textarea>
		</div>

		<div class="gf-form-button-row">
			<button type="button" class="btn btn-success" ng-show="canUpdate" ng-click="update(); dismiss();">Update</button>
		</div>
	</div>
</div>