Hi @corinja,
Try it:
{{erpnext.url}}/api/resource/{doctype}?fields=["creation"]&filters=[["creation","=","2024-02-19"]]
References:
- REST API
- API to retrieve record count? - #2 by NCP
- [Rest API] Fetch data in linked doctype - #8 by NCP
- [REST API] Fetch parent data by filtering child - #2 by NCP
I hope this helps.
Thank You!