let data = {
    req: this.state.results
  }

  const apiAddress = 'http://localhost:4567/results';
  fetch(apiAddress, {
    method: 'post',
    body: data
  }).then( (res) => {
      console.log(res);
      return res
  });

Request ------WebKitFormBoundaryBvud3Cn7ZmzAtAXt
Content-Disposition: form-data; name="data"

[object Object]
------WebKitFormBoundaryBvud3Cn7ZmzAtAXt--