ajax.js

$.ajax({
	'url': ajaxurl,
	'data': {
		'action': data.crop_action,
		'crop': data.crop,
		'attachment': data.$.return.val()
	},
	'dataType': 'json',
	'type': 'POST',
	'success': function (response, textStatus, jqXHR){
		if (typeof response !== 'object')
			response = { 'status': false, 'message': data.error };
		console.log(response);

		if (!response.status)
			return data.$.uploader.trigger('flag.cropper', ['is_empty']).trigger('unflag.cropper', ['is_loading', response.message]);

		data.$.img = $('<img>').attr('src', response.image.url + "?r=" + parseInt(new Date().getTime()/1000, 10));
		data.$.img.on({
			'load': function() {
				$(this).siblings('img').remove();
				data.$.uploader.trigger('unflag.cropper', ['is_loading']).trigger('flag.cropper', ['is_loaded'])
			}
		}).appendTo(data.$.images);
	},
	'error': function (jqXHR, textStatus, errorThrow){
		return data.$.uploader.trigger('unflag.cropper', ['is_loading', data.error]).trigger('flag.cropper', ['is_empty']);
	},
	'complete': function (jqXHR, textStatus){

	}
});

ajax.php

<?php
add_action('wp_ajax_javascript_action_value', "ajax_func_action");
add_action('wp_ajax_nopriv_javascript_action_value', 'ajax_func_action');

function ajax_func_action() {
	if ( ! defined( 'DOING_AJAX' ) ) {
		return;
	}
	
	$response = (object) array(
		'status' => false,
		'message' => __("Houve um erro na requisição"),
	);

	$request = (object) array(
		'width' => absint($_POST['width']),
		'height' => absint($_POST['height'])
	);

	check_ajax_referer( "javascript_nonce_value" );


	$response->image = (object) array(
		'url' => esc_url($image[0]),
		'width' => absint($image[1]),
		'height' => absint($image[2]),
	);
	$response->ratio = $response->image->width/$response->image->height;

	exit(json_encode($response));
}