NodeJS - reading Image Binary File - node.js

Question

I am working on the API for store a file uploaded by the user.
function uploadPhoto(req, res) {
var imagedata = new Buffer('');
req.body.on('data', function (chunk) {
imagedata = Buffer.concat([imagedata, chunk]);
});
req.body.on('end', function (chunk) {
fs.writeFile('success.jpeg', imagedata, 'binary', function (err) {
if (err) throw err
console.log('File saved.')
})
});
}
There is an error when I used req.body.on('data').
The data from postman
When I print out the value of req.body with console.log("message: "+req.body), it was string and has value:
I tried to write to file by using Buffer like this
var writeFile = function (type, cb) {
var data = new Buffer(req.body, type);
fs.writeFile(type + '.jpeg', data, type, function (err) {
cb(null, data.length);
});
}
async.parallel([
writeFile.bind(null, 'binary'),
writeFile.bind(null, 'utf8'),
writeFile.bind(null, 'ascii'),
writeFile.bind(null, 'ucs2'),
writeFile.bind(null, 'base64')
], function (err, results) {
response.status(200).send({});
})
This will create some jpeg files with different size but can't read them as an image.
How can I store this image from the user?
Thank you very much.

Answer 1

This looks like a good case for streams.
function uploadPhoto(req, res) {
var file = fs.createWriteStream(__dirname + '/success.jpeg')
req.pipe(file).on('error', function(err) { console.log(err) })
}
Headers could also help determine what file type and character encoding it has.
var file = fs.createWriteStream(__dirname + '/success.jpeg', {defaultEncoding: req.headers.encoding || 'utf8'})