Wordpress custom JSON feed with multiple categories - json

Question

Good morning to all.
It is possible to have a custom JSON feed with the last 10 posts from all categories with 10 or more posts published?
I'm doing that with a loop over all categories with 10 or more posts published using the JSON API plugin for wordpress by dphiffer
So if I have 14 categories I will do 140 requests and overload the server.
I'm searching for a way to do that with 1 or 2 requests. Like first request to get the categories indexes with 10 or more posts and the second request with all the data.
Thanks
Here is the code i've developed so far:
<script type="text/javascript">
var slug = 'news'; // Main categorie
var maxLength = 10; // Total of articles per categorie
var wpurl = 'http://wpurl.com'; // WP URL
var loadedValue, loadedTotal;
var categories = new Array();
var newsData = new Array();
//Get main categorie index by slug
$.ajax({
url: wpurl+'/?json=get_category_index',
type: 'GET',
dataType: 'jsonp',
success: function(data){
for (i = 0; i < data.categories.length; i++) {
var cat = data.categories[i];
if(cat.slug == slug) {
get_all_categories(cat.id);
}
}
},
error: function(data){
console.log(data);
}
});
//Get all sub-categories from an categorie slug
function get_all_categories(cat_index) {
$.ajax({
url: wpurl+'/?json=get_category_index&parent='+cat_index,
type: 'GET',
dataType: 'jsonp',
success: function(data){
for (i = 0; i < data.categories.length; i++) {
var cat = data.categories[i];
//Check if categorie have 10 (maxLength) or more posts. If so push it to array (categories)
if(cat.post_count >= maxLength) {
categories.push({
'index': cat.id,
'title': cat.title
});
}
}
},
error: function(data){
console.log(data);
}
}).done(function() {
//Set loading
var totalItem = categories.length*maxLength;
var actualItem = 0;
var loaded = 0;
for(var i=1; i<=categories.length; i++){
prepareCategory(categories[i-1].index, maxLength, i);
function prepareCategory(categorieIndex, maxLenght, count) {
var content;
$.ajax({
url: wpurl+'/api/get_category_posts?category_id='+categorieIndex+'&count='+maxLenght+'&status=publish',
type: 'GET',
dataType: 'jsonp',
success: function(data){
for (e = 0; e < data.posts.length; e++) {
//Loading percent
actualItem++;
loaded = (actualItem/totalItem)*100;
document.getElementById('loadingBox').innerHTML = 'Loading: '+Math.round(loaded)+'%';
//Post data
var post = data.posts[e];
var title = post.title;
var thumb = post.thumbnail_images.appthumb.url || 'content/images/noimage.png';
var newContent = '<div class="new"><img src="'+thumb+'" width="320" height="164"><div class="new_description">'+title+'</div></div>';
var newId = 'cat'+count+'new'+(e+1);
newsData.push({
'id': newId,
'content':newContent
});
}
},
error: function(data){
console.log(data);
}
});
}
}
});
};
function loaded() {
if (window.localStorage.length != 0)
{
localStorage.clear();
setGlobalStorageAndRedirect();
} else {
setGlobalStorageAndRedirect();
}
function setGlobalStorageAndRedirect() {
localStorage.setItem('postPerCat', maxLength);
localStorage.setItem('catNumbs', categories.length);
localStorage.setItem('wpurl', wpurl);
localStorage.setItem('categoriesArray', JSON.stringify(categories));
localStorage.setItem('newsData', JSON.stringify(newsData));
window.location="main.html";
}
}
</script>