One of the greatest advantages of the Dynamics 365 suite is its web-based frontend. Users do not need a fat client installed on their machines to access the platform; a web browser is enough to access it. Most end users consider frontend user experience paramount to their day-to-day job. Dynamics 365 Sales offers a wide range of configurable extensions to enhance frontend user experience. In the previous chapter, we covered some no-code extensions; however, sometimes, customer requirements go beyond what Dynamics 365 offers out of the box. This is where JavaScript comes into the picture. JavaScript is currently the most popular web frontend scripting language. It is widely used in the industry and, thus, makes it easy for developers to pick up and start using.

Most online resources and training materials you find typically cover the bare minimum to achieve your extensions. Very few actually give you guidance on how to use modern industry standards to build enterprise-scale client-side extensions. Over the years, I have inherited a great deal of Dynamics CRM implementations with poorly written client-side extensions, making them difficult to maintain and enhance.

Not only does this chapter cover some simple recipes to leverage the power of JavaScript extensions, but it also focuses on code structuring techniques and debugging capabilities to assist you in implementing scalable JavaScript whilst also helping you improve your frontend development efficiency.