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Your are trying to get a file from the server, but you are using the POST method !!!
If this is what your are trying to do, so you should do something like this:
router.get('/filesFolder?:fileName', function(req, res){
let filePath = '.. the path of your local files folder ..+ '/' +req.query.fileName
if (fs.existsSync(filePath)) {
//file exists
res.sendFile(filePath);
}
});
Where filesFolder is the folder’s name in which you store your files; fileName is the name of the file you are requesting; filePath is the path under filesFolder of the requested file.
Source:stackexchange.com