Download random google images in a specific format

download_images.js

var fs = require('fs');
var url = require('url');
var path = require("path");
var request = require('sync-request');
var base_url = "https://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=";

function downloadImages(type) {
	var res = JSON.parse(request('GET', base_url + type + '&as_filetype=' + type + '&start=' + Math.floor((Math.random() * 50) + 1)).body.toString('utf-8'));
	if(res['responseData']['results']) {
		var images = res['responseData']['results'];
		images.forEach(function (image, i) {
			var last_slash_after_period = image.url.indexOf('/', image.url.lastIndexOf('.'));
			images[i] = (last_slash_after_period == -1) ? image.url : image.url.substring(0, last_slash_after_period);
			var local_filename =  path.basename(url.parse(images[i]).pathname);
			if(!fs.existsSync('test_images/' + local_filename)) {
				console.log("Downloading '" + local_filename + "'");
				fs.writeFileSync('test_images/' + local_filename, request('GET', images[i]).body);
			}
			else {
				console.log("Skipping '" + local_filename + "'");
			}
		});
	}
}

// repeat the download process 10 times for each image type
for(var i = 0; i < 10; i++) {
	downloadImages('png');
	downloadImages('jpg');
	downloadImages('gif');
	downloadImages('bmp');
}

console.log('Done');