<div>
    <div id="res">Download</div>
    <a id="target" class="hidden"></a>
</div>

const download = function() {
        const dElem = document.getElementById('target');
        const jsonStr = {
            'name': 'dqi',
            'description': 'test'
        };

        dElem.setAttribute('href', 'data:text/json;charset-utf-8,' + JSON.stringify(jsonStr));
        dElem.setAttribute('download', 'test.json');
        dElem.click();
    };

    const dlink = document.getElementById('res');
    dlink.addEventListener('click', download);