const dataProcessings;
const settings =
{
    method: 'GET',
    headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer test_1234'
    }
};

const apiRequest = new Request(
    'https://api.dastra.eu/v1/ws/53/dataprocessings?' 
    + new URLSearchParams(
    {
        size: 20,
        sortBy: 'Label'
    }))

fetch(apiRequest, settings)
    .then(response => {
        dataProcessings = response.items
    })