GET Values from a custom field via JIRA REST API - rest

Question

I would like to GET all drop down options for a custom field. For system fields, I use the following URI:
http://localhost:8080/rest/api/2/project/XXXX/components
(for components, versons, etc. Basically system fields), so I tried the following for a custom field
http://localhost:8080/rest/api/2/project/XXXX/customfield_10000
and got a 404 error. I'm not sure what I'm doing wrong as I've been googling for the past 19 hours. The best I search result I got was the following documentation: JIRA Developers Documentation
Please assist, I'm not sure What I'm missing

Answer 1

You can get that information either from the createmeta or editmeta REST resources.
Use editmeta if you want to retrieve the available options when editing a specific issue. E.g.
GET /rest/api/2/issue/TEST-123/editmeta
Use createmeta when you want to retrieve the options for a project in combination with an issue type. E.g.
GET /rest/api/2/issue/createmeta?projectKeys=MYPROJ&issuetypeNames=Bug&expand=projects.issuetypes.fields
The customfields with options will be returned like this:
"customfield_12345": {
"schema": {
"type": "string",
"custom": "com.atlassian.jira.plugin.system.customfieldtypes:select",
"customId": 12345
},
"name": "MySelectList",
"allowedValues": [
{
"self": "http://jira.url/rest/api/2/customFieldOption/14387",
"value": "Green",
"id": "14387"
},
{
"self": "http://jira.url/rest/api/2/customFieldOption/14384",
"value": "Blue",
"id": "14384"
}
]
}