Scriptrunner for JIRA does implement a REST API to allow integration from outside JIRA for performing tasks.
Here is the documentations for the REST API Endpoints:
I am considering using ScriptRunner to change the workflow based on the value field in the an issue. Some solutions were proposed here. We have some performance concerns about letting everyone uses REST API. The functions needed for the moment may not have an impact on performance. How one can tell whether a function called is not using REST API?
Nor do I. The REST API exposes JIRA to calls from other systems, so they can query and update JIRA issues. You can think of it as a (slightly less feature-rich) user interface on to JIRA that is aimed at computers instead of humans.
The Script Runner adds lots of functions to JIRA that give you a lot more flexibility and power inside it.
I'm not sure what the question is now, as they're not really related to each other.
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