here is my problem

I want to loop data from two entities Project and User, my Project entity have a field with User id called creatorId.

I looped it and tried to add my user data _id, displayname and avatarUrl.

For now that work, but when I send it from the backend to the frontend nothing appears, like the array is empty.

const projectList = [];
  Project.find({}, function(err, projects) {
     projects.map(project => {
      User.findById(project.creatorId, function(err, creator){
        projectList.push({
          _id: project._id,
          title: project.title,
          description: project.description,
          avatarUrl: project.avatarUrl,
          creationDate: project.creationDate,
          projectCreator: {
            _id: creator._id,
            displayname: creator.displayname,
            avatarUrl: creator.avatarUrl
          },
          git: project.git
        })
      })
    })
  });
  res.send(projectList);