This was my first experience for create API. Stack: Node.js, Express, JWT, GraphQL, Postman.

Task : Create an API to manage a virtual library.

The main functionalities should include:

• user registration (login, name, password)

• user login (login, password)

• administrator registration (login, name, password)

• administrator login (login, password)

• adding a book (name, ISBN, author) to the pool of books (by the administrator)

• removing a book from the pool of books (by the administrator)

• editing data details of the selected book (by the administrator)

• listing all books (by the user and administrator)

• listing of books available for borrowing (by the user and administrator)

• borrowing a book (by the user)

• return of the book (by the user)

The user should not be able to perform administrator actions and vice versa.

A borrowed book cannot be borrowed again, unless the user who borrowed it returns it.