Sending the pdf file without saving

[suri1996]

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Steps to reproduce
I am using this library for generating a PDF receipt on the server side.

Here is my code:

const getReceipt = (req, res) => {
logger.info("getReceipt", {query: req.query});
if (!req.query.receipt) { res.status(400).end(); return; }
return db.get(req.query.receipt, (err, value) => {
if (err) { res.status(404).end(); return; }
// res.json(value);
var doc = new jsPDF();
res.set("Content-Type", "application/pdf");
//res.json({tx: JSON.parse(value)});
var dox = JSON.parse(value);
doc.setFontSize(30);
doc.text(90, 20, "Receipt");
doc.setFontSize(20);
doc.text(20, 40, "Order");
doc.setFontSize(15);
var len = dox['items'].length;
var y = 60;
var total = 0;
for(var j=0; j<len;++j) {
var price;
var quantity;
for(var key in dox['items'][j]) {
doc.text(20, y, key.replace("", " "));
doc.text(170, y, dox['items'][j][key].toString());
if(key=="unit_price") { price = dox['items'][j][key]; }
if(key=="quantity") { quantity = dox['items'][j][key]; }
y=y+10;
}
doc.text(110, y, "Subtotal");
doc.text(170, y, (pricequantity).toString());
total += pricequantity;
y=y+20;
}
doc.text(110, y, "Total");
doc.text(170, y, total.toString());
y = y+20;
doc.setFontSize(20);
doc.text(20, y, "Payment");
y = y+20;
doc.setFontSize(10);
if (!("details" in dox))
dox["details"] = {};
else if (typeof(dox["details"])==="string")
dox["details"] = JSON.parse(dox["details"]);
if (!("payment" in dox["details"]))
dox["details"]["payment"] = {};
if (!("messages" in dox["details"]["payment"]["messages"]))
dox["details"]["payment"]["messages"] = {}
for(var key in dox['details']['payment']['messages']) {
if(key[0]!=='') {
doc.text(20, y, key.replace("_", " "));
doc.text(130, y, dox['details']['payment']['messages'][key].toString());
}
y+=10;
}
res.send(doc);
return;
});
};
When I try to save the pdf it works perfectly, however, when I try to return it, it gives this error: Converting circular structure to JSON, and it gives this error at the line: 'res.send(doc)'. I know this is not an issue, I wasn't sure if this library is capable of doing this in the first place, but some help would be appreciated.

[Uzlopak]

well... you probably want to send the generated pdf. So it should be imho:
res.send(doc.output());