How to export console output to a textfile in JAVASCRIPT

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Javascript

All am trying to do is to copy whatever is in my console output
to a textfile-"blob.txt"

Now what is happening is I get a textfile generated successfully.
But the content is not what is on my console. Rather THE TEXTFILE JUST HAS **[object object]**

Below is my code..can someone tell me what am doing wrong?

Note-fileData is the string that am storing content that gets populated on the console.

Thanks, in advance!!

var a = window.document.createElement('a');
    a.href=window.URL.createObjectURL(new Blob([fileData],{type:'filename/txt'}));
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);

What I have tried:

var a = window.document.createElement('a');
    a.href=window.URL.createObjectURL(new Blob([fileData],{type:'filename/txt'}));
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);