question Can I still use jslog in service portal or client script from catalog, widget? in Community Central forum

Can I still use jslog in service portal or client script from catalog, widget?

JamesZachaB — Thu, 27 Nov 2025 17:41:18 GMT

Hello I notice that when I use jslog in catalog client script it throws an error
"Error while running Client Script Reference error: jslog is not defined"

Re: Can I still use jslog in service portal or client script from catalog, widget?

Vishal_Jaiswal — Thu, 27 Nov 2025 17:45:42 GMT

Hi @JamesZachaB ,

You cannot use jslog() in the Service Portal, Service Portal Widgets, or Mobile interfaces.

The error ReferenceError: jslog is not defined occurs because jslog() is a legacy function built specifically for the Classic (Backend/Native) UI.

It relies on the "JavaScript Log" window found in the main ServiceNow frame, which does not exist in the Service Portal environment.

Regards,

Vishal

Re: Can I still use jslog in service portal or client script from catalog, widget?

Sarthak Kashyap — Thu, 27 Nov 2025 17:48:36 GMT

Hi @JamesZachaB ,

I think you can not use jslog in service widgets, you can use alert in client script and console.log or gs.log in server script

Also check some articles

https://www.servicenow.com/docs/bundle/zurich-api-reference/page/script/debugging/concept/c_WritingToTheDebugLog.html

https://www.servicenow.com/community/developer-forum/jslog-method-is-not-writing-anything-to-javascript-log/m-p/2166313

https://www.servicenow.com/community/developer-blog/servicenow-things-to-know-89-debug-client-side-scripts/ba-p/2792268

https://www.servicenow.com/community/developer-forum/finding-jslog-in-sandiego/m-p/1640287/page/2

Please mark my answer correct and helpful if this works for you

Thanks and Regards,
Sarthak