GitHub API: Get email addresses of all members of organization

You can use git repository instead! There are plenty of interesting information inside.

Try to run:

git shortlog -s -n -e

You will see the list of committers with email address.

Using GraphQL API v4, you don't have to call a request per user. The following will get members of an organization with their email (if provided in public profile) :

{
  organization(login: "my-org") {
    membersWithRole(first: 100) {
      totalCount
      edges {
        node {
          login
          name
          email
        }
      }
      pageInfo {
        endCursor
        hasNextPage
      }
    }
  }
}

Try it in the explorer

[edit 08/2020] Using membersWithRole instead of deprecated members field

After fetching the list of org members, fetch the info for each member using this API endpoint:

/users/:user

This will return the e-mail address of the user you have specified in your request URL.