How to send a pdf file from Node/Express app to the browser

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You have to pipe from Readable Stream to Writable stream not the other way around:

var file = fs.createReadStream('./public/modules/datacollectors/output.pdf');
var stat = fs.statSync('./public/modules/datacollectors/output.pdf');
res.setHeader('Content-Length', stat.size);
res.setHeader('Content-Type', 'application/pdf');
res.setHeader('Content-Disposition', 'attachment; filename=quote.pdf');
file.pipe(res);

Also you are setting encoding in wrong way, pass an object with encoding if needed.

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