JavaScript extract both JSON and headers from fetch()

I thought I'd share the way we finally solved this problem: by just adding a step in the .then chain (before parsing the JSON) to parse the auth headers and dispatch the proper action:

fetch('/some/url')
  .then(res => {
    const authHeaders = ['access-token', 'client', 'uid']
      .reduce((result, key) => {
        let val = res.headers.get(key);
        if (val) {
          result[key] = val;
        }
      }, {});
    store.dispatch(doSomethingWith(authHeaders)); // or localStorage
    return res;
  })
  .then(res => res.json())
  .then(jsonResponse => doSomethingElseWith(jsonResponse))

One more approach, inspired by the mighty Dan Abramov (http://stackoverflow.com/a/37099629/1463770)

fetch('/some/url')
  .then(res => res.json().then(json => ({
    headers: res.headers,
    status: res.status,
    json
  }))
.then({ headers, status, json } => goCrazyWith(headers, status, json));

HTH

Answer:1

My solution for the WP json API

fetch(getWPContent(searchTerm, page))
  .then(response => response.json().then(json => ({
    totalPages: response.headers.get("x-wp-totalpages"),
    totalHits: response.headers.get("x-wp-total"),
    json
  })))
  .then(result => {
    console.log(result)
  })
Answer:2

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