How to find the nodes within a file

[arthur798]

So I have a code like that

    var text = await execPromise('pdftohtml -i -xml -stdout /tmp/test-sync');

    const parser = new DOMParser();
    let xmlDoc = parser.parseFromString(text,"text/xml");
    
    console.log(xmlDoc.getElementsByTagName(4))

now pdftohtml gives a nice xml with position of each line and the content of it but how do I access it within the dom parser?