Do you mean Java Api or Rest Api?
If java api then you shoud use
List<Project> projectList = ComponentAccessor.getProjectManager().getProjectObjects()
for (Project project : projectList) {
project.getKey()
}
If Rest Api then you can find more info here:
https://developer.atlassian.com/cloud/jira/platform/rest/#api-api-2-project-get
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