Uncaught (in promise) SyntaxError: Unexpected end of input

export function loginUser(creds) {

  let config = {
    mode: 'no-cors',
    method: 'POST',
    headers: { 'Content-Type':'application/x-www-form-urlencoded' },
    body: `email=${creds.email}&password=${creds.password}`
  };


  return dispatch => {
    dispatch(requestLogin(creds));
    return fetch('http://localhost:4000/api/authenticate', config)
    .then(response =>
      response.json()
      .then(user => ({ user, response }))
    ).then(({ user, response }) =>  {
      if (!response.ok) {
        dispatch(loginError(user.message));
        return Promise.reject(user);
      } else {
        localStorage.setItem('id_token', user.token);
        dispatch(receiveLogin(user));
      }
    });
  };
}