Development of applications for PC

Refinement of an existing product, development from scratch. Help is needed in the test task. The form was created (by me). The task is to create a simple Node backend.js and a MongoDB instance. Connect the database to the form using the backend Node.js . Submitting the form should send the values to the backend, and then the backend should insert the values from the form into the database. A full explanation, comments, and, most importantly, high-quality execution are required