Whenever I write about troubleshooting tactics in NetSuite, I get a few questions about how to use the SuiteScript Debugger.
The honest, ugly truth is: I don’t use the SuiteScript Debugger.
For whatever reason, I’ve never been a fan of debuggers in any language. In all my programming career, I’ve been the most effective using log/print statements when troubleshooting.
Secondarily, I use WebStorm as my IDE rather than Eclipse, so I can’t access the debugger anyway.
But that doesn’t mean you can’t use it!
NetSuite Help has a full section on using the Debugger that seems fairly comprehensive. I’d recommend starting with the page “SuiteScript Debugger Overview” and reading through the subsequent Debugger pages it leads you to. There’s a lot of information and “How To” in there.