pass JSON Dictionary into html onclick

I would like to write the following variable in the HTML code through JavaScript.

{
  "content": "Hallo Welt, das ist ein Testn",
  "filelength": 1,
  "filename": "a5c12c102bdaed8ee80168cb41606295eaf5512ba04045fac5dd0dc65c2f54f13566090025c05f14cdfdf9b1e39ce835c6f3262a4aedba31f8b6d07ed299b23b",
  "language": "plain",
  "path": "caadaf7ed1f27ea37cbb9157d9c6cff1683cae85244b772c856b660c3609ad32faa0d6997ecaf727c46650443f1a03f63c0f67219f46d10cf5295556579422b6/c6ee9e33cf5c6715a1d148fd73f7318884b41adcb916021e2bc0e800a5c5dd97f5142178f6ae88c8fdd98e1afb0ce4c8d2c54b5f37b30b7da1997bb33b0b8a31/a5c12c102bdaed8ee80168cb41606295eaf5512ba04045fac5dd0dc65c2f54f13566090025c05f14cdfdf9b1e39ce835c6f3262a4aedba31f8b6d07ed299b23b",
  "type": "text"
}

The problem is, when I look at the HTMl code in the browser, it doesn’t show the corresponding variable, it shows

[object Object]

here the code to extend the HTML code

// create the row
let row = "<tr>";

// set the actions
let actions_append = '';
// file
if (value['type'] === 'file') {
    // preview
    if (value['preview_available']) {
        console.log(value["preview"]);
        actions_append += `<td nowrap width="1%">
                                <span data-toggle="tooltip" title="Vorschau" onclick="setPreviewContent(${value['preview']})">
                                    <button onclick="setNames('${value['name']}')" type="button" class="btn btn-link btn-sm"
                                        data-toggle="modal" data-target="#previewModal"><i class="material-icons text-primary">desktop_windows</i>
                                    </button>
                                </span>
                            </td>`
    }
}
// append row to table
$('#fileTableBody').append(row + actions_append + '</tr>')

here the HTML code resulting output

<td width="1%" nowrap="">
<span data-toggle="tooltip" title="Vorschau" onclick="setPreviewContent('[object Object]')">
    <button onclick="setNames('test.txt')" type="button" class="btn btn-link btn-sm"
            data-toggle="modal" data-target="#previewModal"><i class="material-icons text-primary">desktop_windows</i>
    </button>
</span>
</td>

Can anybody help me? I don’t know JavaScript so well.