Why is there a problem of jumping images through a node js loop?

Question

JavaScript

There is an associative array in which there are a lot of url (thousands) by which pictures should be downloaded. The problem is that I can download one image by url, but when I try the script in a loop, it does not work.
The script creates a bunch of files weighing 0kb (that is, the picture is not loaded with an empty file), then it stalls completely.
My assumptions are that there are a lot of files, plus a double cycle, perhaps because of this he simply does not have time to upload files?
If this is the case, how can I make the next image load after the previous one has loaded?
Here is an example of the array itself:

var json = {

    "1223": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"]
    },

    "2323": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "21323": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "23423": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "5432": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "234234": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "34234": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    },
    "23421": {
        "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"],
    }

Here's an example of how I'm trying to download:

for (property in json) {
  //--- console.log(json.PHOTO)
  json[property].PHOTO.forEach(function(item, i, arr) {
    //--console.log(item);
    var file = fs.createWriteStream(i);
    var request = http.get(item, function(response) {
      response.pipe(file);
    });
  })
}

If anyone faced a problem, tell me how to solve it?

Answer 1

I just tweaked the naming of the files a little, everything seems to be working.

The code

var fs = require('fs');
var http = require('http');
var child_process = require('child_process');
var json = {
  "1223": {
    "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"]
  },
  "2323": {
    "PHOTO": ["http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg", "http://nagadali.ru/wp-content/uploads/2015/12/zhenshhina-rozhdennaya-v-god-krolika-kota-ochen-lyubopytna-500x375.jpg"]
  }
};

for (property in json) {
  json[property].PHOTO.forEach(function(item, i, arr) {
    var path_arr = item.split('/');
    var index_of_extension_dot = path_arr[path_arr.length - 1].lastIndexOf('.');
    var extension = (index_of_extension_dot === -1)  ? false : path_arr[path_arr.length - 1].substr(index_of_extension_dot + 1, path_arr[path_arr.length - 1].length - 1);
    var path, file, request;
    
    if (extension) {
      path = property + '-' + i + '.' + extension;
      file = fs.createWriteStream(path);
      request = http.get(item, function(response) {
        response.pipe(file);
      });
    } else {
      console.log('error: an extension should be specified to prevent raw HTML loading', property, i, item);
    }
  })
}