how to find custom-fields for JIRA EPIC name

[sudhanshu]

I found many examples using this `customfield_13100: "Epic name"` in rest API but this is installation dependent so need to know how i can find that.

```
{fields:{ project: { key: project_key }, customfield_100016:{value: "Epic"}, summary: epic, description: "test epic", issuetype: { name: issueType } } }
```

[Nic Brough -Adaptavist-]

Log in as an admin, go to Admin -> Issues -> Custom fields, and find Epic Name in the list.  Click the ... menu to the right of it and look at the urls the links in the menu go to, they contain a parameter like CusomtFieldId=10010  

[Hana Kučerová]

Hi @sudhanshu ,

welcome to the Atlassian Community!

Just to be sure - your question is, how to find out, which id the custom field Epic Name has in your instance using REST API?

Or you need to get information about the epic from the issue and then work with it somehow? Would you please provide more information, what you are trying to achieve? Thank you.