psd.js

  NodeJS Example
var PSD = require('psd');
var psd = PSD.fromFile("path/to/file.psd");
psd.parse();

console.log(psd.tree().export());
console.log(psd.tree().childrenAtPath('A/B/C')[0].export());

// You can also use promises syntax for opening and parsing
PSD.open("path/to/file.psd").then(function (psd) {
  return psd.image.saveAsPng('./output.png');
}).then(function () {
  console.log("Finished!");
});

Browser Example
var PSD = require('psd');

// Load from URL
PSD.fromURL("/path/to/file.psd").then(function(psd) {
  document.getElementById('ImageContainer').appendChild(psd.image.toPng());
});

// Load from event, e.g. drag & drop
function onDrop(evt) {
  PSD.fromEvent(evt).then(function (psd) {
    console.log(psd.tree().export());
  }); 
}