THREE.js and AFRAME glTF exporter bookmarklet

gltf_bookmarklet.js

javascript:(function(){
var link = document.createElement( 'a' ); link.style.display = 'none'; document.body.appendChild( link );

  function save( blob, filename ) { link.href = URL.createObjectURL( blob ); link.download = filename; link.click(); }
  function saveString( text, filename ) { save( new Blob( [ text ], { type: 'application/json' } ), filename );}

  var script=document.createElement('script');
  script.src='https://threejs.org/examples/js/exporters/GLTFExporter.js';
  script.onload = function () {
    var exporter = new THREE.GLTFExporter();
    var sceneToExport = window.AFRAME ? AFRAME.scenes[0].object3D : scene;
    exporter.parse(sceneToExport, function (result) {
      var output = JSON.stringify( result, null, 2 );
      console.log( output );
      saveString( output, 'scene.gltf' );
    });
    };
    document.head.appendChild(script);
})()