I keep receiving an Auth0 SDK error

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1

Hi Auth0 Community,

I’m currently integrating the Auth0 SPA SDK into a local project, but I’m consistently running into an issue where the SDK fails to load. Here’s what’s happening:

Issue:

The following error appears in the browser console:

Auth0 SDK failed to load
(index.html:60)

When inspecting the request, I see a 403 Forbidden on:

https://cdn.auth0.com/js/auth0-spa-js/1.26/auth0-spa-js.production.js

I also tried:

  • https://cdn.auth0.com/js/auth0-spa-js/2.0/auth0-spa-js.production.js
  • https://cdn.jsdelivr.net/npm/@auth0/auth0-spa-js/dist/auth0-spa-js.production.js

But either get 403 errors or the SDK still doesn’t load properly.

What I’ve tried:

  • Switched to jsDelivr CDN (same result)
  • Used a local server (python3 -m http.server 8080)
  • Tried different browsers (Chrome, Firefox)
  • Disabled ad blockers, VPNs, privacy extensions
  • Tried loading the SDK directly in the browser (also failed or 403)
  • Attempted offline usage by downloading the script manually (no success)
  • Network seems fine otherwise

My Question:

Is there a new preferred CDN link or a configuration I’m missing?
Are there IP blocks or region issues I should be aware of?

Any advice or a working, current SDK URL would be super helpful. Thanks in advance!

Environment:
Local testing environment HTML + JS (no framework)
Tenant: dev-tnhr6w3ixu052ugm

4

Hi @junoswift13

Welcome to the Auth0 Community!

I am sorry about the delayed response to your inquiry!

Do you still have issues with the SDK installation?
Have you tried installing it using npm? The command would be npm install @auth0/auth0-spa-js.
Could you also try using this link with CDN: https://cdn.auth0.com/js/auth0-spa-js/2.2/auth0-spa-js.production.js

Kind Regards,
Nik