BooksAPI.js

const api = "https://reactnd-books-api.udacity.com";

// Generate a unique token for storing your bookshelf data on the backend server.
let token = localStorage.token;
if (!token)
  token = localStorage.token = Math.random()
    .toString(36)
    .substr(-8);

const headers = {
  Accept: "application/json",
  Authorization: token,
};

export const get = (bookId) =>
  fetch(`${api}/books/${bookId}`, { headers })
    .then((res) => res.json())
    .then((data) => data.book);

export const getAll = () =>
  fetch(`${api}/books`, { headers })
    .then((res) => res.json())
    .then((data) => data.books);

export const update = (id, shelf) =>
  fetch(`${api}/books/${id}`, {
    method: "PUT",
    headers: {
      ...headers,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ shelf }),
  }).then((res) => res.json());

export const search = (query) =>
  fetch(`${api}/search`, {
    method: "POST",
    headers: {
      ...headers,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ query }),
  })
    .then((res) => res.json())
    .then((data) => data.books);