ReadFile in Base64 Nodejs

I try to read an image from client, encoded in base64. How to read with nodejs this?

My code:

           // add to buffer base64 image
            var encondedImage = new Buffer(image.name, 'base64');

            fs.readFile(encondedImage, "base64", function(err, buffer){
                if ( err ) {
                    console.log('In read file')
                    console.log(err)
                } else {
                    // check err
                    lwip.open(buffer, 'jpg', function(err, image){
                        console.log('in open')
                        if ( err ) console.log(err)

                        if ( image ) console.log(image)
                        // check 'err'. use 'image'.
                        // image.resize(...), etc.
                    });

But, i get error:

In read file
[Error: Path must be a string without null bytes.]

* SOLUTION *

lwip accept buffer in open method.

// add to buffer base64 image from step
var encondedImage = new Buffer(image.name, 'base64');

// check err
lwip.open(encondedImage, 'jpg', function(err, image){
  // image.resize(..), etc
});