In this video, you will learn how to update a Sitemap.xml file using JavaScript.
You can check and download full source code from the Github repo here https://github.com/erpardeepjain/dynamic-sitemap-update-js.

For folks who are using it with Angular -
https://github.com/erpardeepjain/angular-dynamic-sitemap-update-scrip

Also, I wrote a blog on the same https://medium.com/@PardeepJain/how-to-create-dynamic-sitemap-xml-using-javascript-ee4d9ba7402a

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