Book Image

Mastering ServiceNow Scripting

By : Andrew Kindred
Book Image

Mastering ServiceNow Scripting

By: Andrew Kindred

Overview of this book

Industry giants like RedHat and NetApp have adopted ServiceNow for their operational needs, and it is evolving as the number one platform choice for IT Service management. ServiceNow provides their clients with an add-on when it comes to baseline instances, where scripting can be used to customize and improve the performance of instances. It also provides inbuilt JavaScript API for scripting and improving your JavaScript instance. This book will initially cover the basics of ServiceNow scripting and the appropriate time to script in a ServiceNow environment. Then, we dig deeper into client-side and server-side scripting using JavaScipt API. We will also cover advance concepts like on-demand functions, script actions, and best practices. Mastering ServiceNow Scripting acts as an end-to-end guide for writing, testing, and debugging scripts of ServiceNow. We cover update sets for moving customizations between ServiceNow instances, jelly scripts for making custom pages, and best practices for all types of script in ServiceNow. By the end of this book, you will have hands-on experience in scripting ServiceNow using inbuilt JavaScript API.
Table of Contents (18 chapters)
Title Page
Packt Upsell

The script debugger

The script debugger allows developers to debug server-side script to discover errors or issues with their code. We had a brief look at the script debugger in Chapter 5, Introduction to Server-Side Scripting.

To recap, we can set breakpoints in the server-side script we have written to debug the script when it is run by using the script debugger. This is the only way we can use breakpoints in ServiceNow to step through and into our script.

To use the script debugger, we first need to set a breakpoint in one of our server-side scripts. This can be any script you want to step through, either a system script or one you have built yourself. A good example is the incident_events business rule, as we can also see how different events are triggered from the incident form, too.

To start, we add a breakpoint in the incident_events business rule, as seen in Figure 9.1:

Figure 9.1: Business rule incident_events with break point added

To set this breakpoint, we simply click in the margin...