Debugging

link - learn.microsoft.com/en-us/office/dev/add-ins/testing/debug-add-ins-overview 
link - learn.microsoft.com/en-us/office/dev/add-ins/testing/debug-add-ins-using-f12-developer-tools-on-windows-10 
link - learn.microsoft.com/en-us/office/dev/add-ins/testing/runtime-logging 
link - channel9.msdn.com/Series/Beginners-Series-to-NodeJS/How-to-read-a-stack-strace-in-VS-Code-to-debug-a-Nodejs-app-25-of-26 
link - channel9.msdn.com/Series/Beginners-Series-to-NodeJS/How-to-use-the-VS-Code-debugger-with-Nodejs-apps-24-of-26 

PowerShell
Open Command Prompt
type "PowerShell"
Get-AppxPackage Microsoft.Win32WebViewHost
setx JS-DEBUG <PackageFullName>

Install Office-JS for debugging ??

Install the OfficeJS Webpack module
The '--save' switch will add this module as a Dependency in the package.json file.

npm install --save @microsoft/office-js 

JWT

link - jwt.ms 

This is a dedicated web page for viewing JSON Web Tokens.

Attaching to a Process

Visual Studio
Debug > Attach to process
Attach all the iexplorer instances

Internet Explorer Settings

Settings, Advanced
clear the following two checkboxes
Disable Script Debugging (Internet Explorer) -
Disable Script Debugging (Other) -

Visual Studio - Browser

Once you have removed all references to the Office app and API, you can right-click the project and select the option to View in Browser. This will launch the Visual Studio web server and serve the page as a regular web site, giving you full access to the entire suite of browser tools and extensions to troubleshoot any issues.

Chrome - Developer Tools

But what if you really need a feature from one of the browsers such as the Chrome Developer Tools or browser add-ons such as Web Developer Tools and Kendo UI Chrome Inspector?

Browser - Addon - Web Developer Tools

Browser - Addon - Kendo UI Chrome Inspector

Security / Permissons

Content and taskpane assume the same SSL settings that Internet Explorer uses by default
IE - security tab, internet options, internet, custom level
Scroll to "display mixed content" - select prompt

IE - security tab, internet options, advanced tab
warn if changing between secure and not secure mode

link - secure8.prositehosting.co.uk/officeaddins