Also, you do not seem to be following this user story:
You can POST to /api/users/:_id/exercises with form data description , duration , and optionally date . If no date is supplied, the current date will be used.
Thank you for your answers. Testing code with FCC solution checker creates many users in database, but few with exercises in it. Here is an _id with exercises in it : 61f934b69389d39f1b8d434f. The URL https://boilerplate-project-exercisetracker.djstiff50.repl.co/api/users/61f934b69389d39f1b8d434f/logs shows 4 objects in logs, included both “ex2” and “ex3” created with no date supplied (and still successfully used the current date).