Fetch doesn't retrieve data

Question

I am currently building a login form which will be using a restAPI for the registration/Auth but I'm receiving a 401 error when using fetch to test the retrieved data.

console.log(fetch('http://localhost:5000/users/'), {
    method: 'get',
    headers: {
        'Content-Type': 'application/json'
    },
})

    .then(res => res.json())
    .then(json => console.log(json))