Convert Base64 image to raw binary with Node.js

Question

I have found posts that are close to what I\'m looking for, but I have not been able to successfully implement what I want. Here is the general flow:

1. Submit photo

Answer 1

Make sure your string is correct. This worked for me..

var buf = new Buffer(b64stringhere, 'base64');
var express = require('express'), app = express();
app.get('/img', function(r, s){
    s.end(buf);
})
app.listen(80);

Answer 2

You can take the string from MongoDB, create a new buffer instance, and specify an encoding when doing so. The resultant buffer will be in binary data.

var b64str = /* whatever you fetched from the database */;
var buf = new Buffer(b64str, 'base64');

So in your implementation:

server.get(version+'/images/:id', function(req, res) {
  gridfstore.read(req.params.id, function(err, data) {
    var img = new Buffer(data.buffer, 'base64');

    res.writeHead(200, {
      'Content-Type': 'image/jpeg',
      'Content-Length': img.length
    });
    res.end(img); 

  });
});