How to bulk delete Firebase anonymous users

Question

Due to my probable misuse of anonymous authentication (see How to prevent Firebase anonymous user token from expiring) I have a lot of anonymous users in my app that I don\'

Answer 1

This code sample uses the Firebase Admin SDK for Node.js, and will delete any user that has no providerData, which means the user is anonymous:

function deleteAnonymousUsers(nextPageToken) {
 adminApp
    .auth()
    .listUsers(20, nextPageToken)
    .then(function(listUsersResult) {
      listUsersResult.users.forEach(function(userRecord) {
        if (userRecord.providerData.length === 0) { //this user is anonymous
         console.log(userRecord); // do your delete here
         adminApp.auth().deleteUser(userRecord.uid)
            .then(function() {
                console.log("Successfully deleted user");
            })
            .catch(function(error) {
                console.log("Error deleting user:", error);
            });
        }
      });
      if (listUsersResult.pageToken) {
        // List next batch of users.
        deleteAnonymousUsers(listUsersResult.pageToken);
      }
    })
    .catch(function(error) {
      console.log('Error listing users:', error);
    });
}