How to get active process instance details for a process definition by its key using the rest API call?

I have a process with the name rest_api_demo. The key for the process is also the same i.e. rest_api_demo. There are multiple running instances for that process. How to get those process instance details using rest API?

it depends what you mean by details of the instances, but I’d suggest to look into REST API docs: Get Instances |
You can search for instances by processDefinitionKey.
I hope that helps.

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Thanks, Eileen for the reply.