file-base64 
- Encode a file to a base64 string
- Dncode a base64 string to a file
Install
$ npm install file-base64 --saveUsage
var base64 = require('file-base64');
base64.encode('text.txt', function(err, base64String) {
console.log(base64String);
});
var base64String = 'swesh523sfsfgwg';
base64.decode(base64String, 'text.new.txt' function(err, output) {
console.log('success');
});