I would like to get all the issue data (including whole worklog: who,when, how much hours) to export in JSON format. It would be nice to have it for all selected issues.
We are using the cloud version. I have read the article: https://confluence.atlassian.com/jirakb/how-to-export-jira-application-issues-to-json-779160777.html
As the article says, you'll need to contact Atlassian Support
@Laszlo Mitnyik you can use the REST API: https://docs.atlassian.com/jira/REST/cloud/
A request like this will give you all the worklog data for all issues in a project:
https://example.atlassian.net/rest/api/2/search?query=project=DEMO&fields=worklog
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