I have created SPFx extension (not a webpart, in case it makes any difference) and trying to add jQuery but its not doing it. I have installed it into package with
npm install --save @types/jquery

"externals": {
      "jquery": "./src/extensions/tracker2/js/JQuery_3.5.1.js"

into config.json ,
import * as jQuery from 'jquery';
into MyPackage.ts
But still getting " jQuery is not defined " when trying to use jQuery in my code.


  • Have you tried with a small 'q' => jquery ? Jan 5, 2021 at 21:54
  • Just a little addition - I am using external js file: extends BaseApplicationCustomizer<ITracker2ApplicationCustomizerProperties> { private _JS: string = "MyTenant.sharepoint.com/sites/DevHubSite/SiteAssets/CustomJS/…"; @override public onInit(): Promise<void> { let articleRedirectScriptTag: HTMLScriptElement = document.createElement("script"); articleRedirectScriptTag.src = this._JS; articleRedirectScriptTag.type = "text/javascript"; document.body.appendChild(articleRedirectScriptTag);" Jan 8, 2021 at 17:27

3 Answers 3


The issue is that you din't isntall jquery.

@types/jquery package does not actually contain jQuery. All packages that start with @types prefix are merely definition files that help your TypeScript to have intellisese.

In install jquery you need jquery package:

npm install jquery --save 

Then, to use the package:

import $ from "jquery";


I have read the Official MS documentation and they are using the following link:

"jquery": "https://code.jquery.com/jquery-3.1.0.min.js"

Perhaps, if you update the link and then run the following commands, the error will go away:

gulp clean
gulp build
  • Tried it - still not defined :( Jan 6, 2021 at 9:33

I tried your method in an extension, here it works fine.

enter image description here enter image description here

Can you have a check if the referenced path/filename is correct? And you can check if jquery file has been loaded or not using F12.

enter image description here


  • I tried same setup you showed and its still not working, JQuery file is not loading (its not there when I check by pressing F12) :( Jan 8, 2021 at 16:43

Started working when I added one line with jQuery into "public onInit()"
As I mentioned I have one js file that I import with
"let articleRedirectScriptTag: HTMLScriptElement = document.createElement("script");"
In which I also have some jquey.
Thanks for all your replies.

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