react native - fetch response.json() gives responseData = undefined

Question

When using fetch:

  fetch(REQUEST_URL, {
      method: 'get',
      dataType: 'json',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      }
    })
    .then((response) => 
      {
        response.json() // << This is the problem
      })
    .then((responseData) => { // responseData = undefined

        console.log(responseData);
     });
     }).catch(function(err) {
        console.log(err);
      })
     .done();

The following works works, do you know why? :

    JSON.parse(response._bodyText)

Answer 1

The chaining response should look more like this, specifically the response.json part. Then you should get an Object back in console.log.

.then(response => response.json())
.then(response => {

    console.log(response)

}