What I m trying to achieve is to get the saved pdf from asset folder in angular 7 and insert page number through jsPDF in each page. I am stuck just after getting the pdf like this:

let headers = new HttpHeaders();
headers = headers.set('Accept', 'application/pdf');

this.http.get('/assets/pdf/myTest.pdf', { headers: headers, responseType: 'blob' }).subscribe(data => {
  console.log(data);
});

I am able to get the pdf but unable to loop through each page for inserting page number using jsPDF in angular 7. My Pdf do not have page number in it. Inserting page number through jsPdf can be achieved like this:

var doc = new jsPDF();
doc.page=1; // use this as a counter.

function footer(){ 
   doc.text(150,285, 'page ' + doc.page); //print number bottom right
   doc.page ++;
};

// and call footer() after each doc.addPage()

Sample pdf can be this. How can I insert page number in the saved pdf? any solution are highly appreciated.