You might already know about this tool, but if you don't, here's a handy little ServiceNow feature that's worth keeping in your developer toolkit: the JavaScript Executor.
It's one of those utilities that many developers stumble across at some point and immediately think, "Where has this been all my life?"
What is the JavaScript Executor?
The JavaScript Executor is a simple tool that lets you run client-side JavaScript directly from the current page. Instead of creating a Client Script, saving it, and testing it repeatedly, you can quickly execute code and see the results right away.
It's like a quick sandbox for testing ideas before you commit them to your instance.
How to get started?
Open where you want to run this, for example open the form view of incident table
press ctrl+shift+J this open the JavaScript executor.
Why It's Useful
Let's say you're trying to figure out which GlideForm method you need, or you want to test a field value before updating a Client Script. Rather than creating temporary scripts, you can just paste your code into the executor and run it.
A few examples:
g_form.getValue('short_description');
g_form.setMandatory('comments', true);
g_form.setDisplay('work_notes', false);
g_form.setValue('short_description', 'test);
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Verifying field values
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Troubleshooting client-side behavior
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Trying out snippets before adding them to a Client Script
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Learning how a particular API behaves
It's especially useful when you're in the "let me quickly test something" phase of development.
A Few Things to Remember
The JavaScript Executor only runs client-side code. It won't help with:
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Business Rules
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Script Includes
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Flow Designer logic
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Server-side scripts
For those, you'll still want to use tools like Scripts - Background, logs, or the Script Debugger.
The JavaScript Executor isn't the most talked-about ServiceNow tool, but it's incredibly convenient for quick client-side testing. If you've never used it before, give it a try the next time you're working on a Client Script or troubleshooting a form issue.
Sometimes the simplest tools end up saving the most time.
