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File formats

When you are creating a visualization extension using Extension editor, the following file types are saved to the project folder:

  • JavaScript
  • QEXT
  • WBL

JavaScript files

All visualization extensions must contain at least one JavaScript file and one QEXT file.

The core of all visualization extensions are made up by the corresponding JavaScript file. The JavaScript file is loaded in the browser when your visualization extension is used. RequireJS is used as a module loader.

For a minimal implementation, refer to the Hello world code example.

Example: com-qliktech-helloworld.js

define( [
function ( ) {

	return {
		paint: function ($element) {
			$element.html( "Hello world!!" );

} );


QEXT files

The extension metadata file (QEXT) is a JSON file, and is used by Qlik Sense to identify the visualization extension. It contains the metadata used for the library or assets panel. When deployed to Qlik Sense, the visualization extension is displayed in the Charts section of the assets panel or library panel.

Information noteThe QEXT file extension must be in lower case letters, as in HelloWorld.qext.
Tip noteMake sure your file meets the requirements of a valid JSON file when creating your QEXT file.

JSON validator: JSONLint

Example: Basic QEXT file

This is what you define in the QEXT file:
	"name" : "Hello World",
	"description" : "Hello World example",
	"icon" : "extension",
	"preview": "helloworld.png",
	"type" : "visualization"
This is how it is displayed in the Preview dialog:

Example QEXT preview, with the name and icon definitions visible in the list, and the name, preview and description definitions visible in the preview popup.


  • A: name definition.
  • B: preview definition.
  • C: description definition.
  • D: icon definition.


The following properties can be defined in the QEXT file.


The name property is mandatory.

This is the name of the visualization extension and is displayed in the library as well as in the preview.

Information noteIt is recommended to use a unique name for the visualization to avoid interference with other visualizations that may have the same name.


The type property is mandatory.

This defines the type of extension. It should always be visualization for visualization extensions.


This defines the description visible in the preview of the visualization extension.


Default is extension.

This defines the icon displayed in the library. It can be:

Library icons
Syntax Icon


Vertical bar chart




Filter pane


Guage chart
"line-chart" Line chart


List box
"map" Map


Pie chart


Scatter chart




"treemap" Treemap


Information noteIf preview is undefined, the icon definition will be used.

This defines which preview image is to be used. The preview image is displayed in a pop-up when you select the visualization extension in the library.

You can define a custom preview image file. For an example of how this is defined, see the HelloWorld code example.

Information noteThe preview image should be saved in PNG format.


"icon": "<CustomImage>.png"


This defines your individual version handling of the visualization extension. This setting is manually defined. Semantic versioning is recommended.


This defines the author of the visualization extension. This setting is manually defined.

WBL files

The Workbench load file (WBL) is used by the Extension editor and lists the name of all files included in the visualization extension project. When you save a visualization extension from the Extension editor, a WBL file is automatically included in the project.

Example: WBL file content

com-qliktech-helloworld.js; com-qliktech-helloworld.qext; helloworld.png;

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