How to convert a Buffer object to a file in Node.js?

I'm developing a web application using (MySQL)EAN stack. I saved png/jpg/pdf as BLOB in MySQL. Now, I can retrieve them as Buffer objects in Node.js by using Sequelize.js:

exports.loadUploadedFiles = function(req, res) {
    db.File.findAll().success(function(files) {
       //res.send(files[0].dataValues.data.toString('ascii')); // I have tried to convert a Buffer to ascii and sent it to Angular.js, however, I still don't know how to transform them to a file link.
       res.send(files); // How can I return the Buffer objects to Angular.js
    }).error(function(err) {
        console.log(err);
        res.sendStatus(500);
    });
};

I have tried two approaches:

• 
  

  Return the Buffer objects to Angular.js, then, find a way to generate downloadable links from them.

  
  


• 
  

  Convert the Buffer objects to ascii by using bufferObject.toString('ascii'), then, find a way to transform these ascii to downloadable links

  
  

I have been trying for a day and still can't figure it out in both approaches :( , any suggestion would be highly appreciated!