Jira REST api project question (What is projectKeys for? and how is it different than key?)

[Brian]

I'm currently exploring the use of this API: https://my.jira-url.com/rest/api/latest/project

I use json-csv.com to convert the json to more readable csv format for my eyes.  I noticed the first column of the JSON returned is called expand.  In it there's a parameter called "projectKeys".

How is "projectKeys" different that the normal "key" that is returned.  Why would I want to use this parameter in the expand feature?

Description and lead and url I get because I don't normally receive that information unless I call them in the expand query.  I just don't get what "projectKeys" gives me that I'm normally not getting.

Thank you in advance,

[Alexey Matveev · Accepted solution]

Hello,

You can change the project key to any other project key. The key value returns the current project key. Projectkeys returns all project keys for the project.

[Brian]

Oh I see, that's useful.  Thank you Alexey for the clearly explained answer.  Kudos to you.