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How to query a user name by a display name

In our CI pipeline, when the unit test fails, we need to parse and get the commit's author such as "Alex Yang" (alias is alexya) who is also a Jira system user.

When I call Jira REST API to create an issue and set the assignee, it needs the "name" of the user in the Jira system such as "alexya" instead of a full or display name "Alex Yang". (using the name I can create the issue successfully, but displayName will fail)


POST /rest/api/2/issue



"fields": {
"project": {
"key": "AAAA"
"summary": "3rd task created with rest API",
"description": "creating of an issue using ids for projects and issue types using the REST API",
"issuetype": {
"name": "Bug"
"assignee": {
"displayName": "Alex Yang"
"priority": {
"id": "2"


It will fail with the error: 


{    "errorMessages": [],    "errors": {        "assignee""expected Object containing a 'name' property"    }}



Furthermore, I tried to use REST API to query the user information, but

the REST API GET /rest/api/2/user?username=alexya can only accept the parameter "username" or "key", can't use the displayName to query the details of a user so that I can't use the displayName to get the user name. e.g.



"errorMessages": [        

"Either the 'username' or the 'key' query parameters need to be provided"    

],    "errors": {}}



Any help will be much appreciated. 


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