I dont know why it dont work.... use it like that :

const url = 'https://api.themoviedb.org/3/movie/top_rated?language=en-US&page=1';
const options = {
  method: 'GET',
  headers: {
    accept: 'application/json',
    Authorization: 'Bearer MyAPIKey'
  }
};


fetch(url, options)
  .then(res => res.json())
  .then(json => console.log(json))
  .catch(err => console.error('error:' + err));