Express - Return binary data from webservice
Here is my slightly cleaned up version of how to return binary files with Express. I assume that the data is in an object that can be declared as binary and has a length:
exports.download = function (data, filename, mimetype, res) { res.writeHead(200, { 'Content-Type': mimetype, 'Content-disposition': 'attachment;filename=' + filename, 'Content-Length': data.length }); res.end(Buffer.from(data, 'binary'));};