Finally, a way to do node.js synchronously

node_sync.js

'use strict';
 
var fs = require('fs');
var co = require('co');
var Promise = require('bluebird');
var readFile = Promise.promisify(require("fs").readFile);

function* doAsyncStuff() {
  var file1 = yield readFile('testx.txt',{encoding:'utf8'});
  return file1;
}
 
co( function *() {
  var file1 = yield doAsyncStuff(); 
  console.log('done ' + file1);
}).catch( function(e) {
  console.log(e);
});