Problem Statement: Develop a RESTful API for a simple note-taking application using Node.js and Express.js, with MongoDB as the database. The API should allow users to create, retrieve, update, and delete text notes.
Four functionalities as requested:
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Create Note: Endpoint to add a new note to the database. Insomnia:
MongoDB: 
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Retrieve Notes: Endpoint to get a list of all notes, with an option to retrieve a single note by its ID. Insomnia: Retrieve every note:
Retrieve note by ID: 
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Update Note: Endpoint to update the content of an existing note. Insomnia:
MongoDB: 
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Delete Note: Endpoint to delete a note from the database. Insomnia:
