How to Get JSON Data from Facebook Graph Api in apex

Apex provides several built-in classes to work with HTTP services and create HTTP requests like GET, POST, PUT, and DELETE.

You can use these HTTP classes to integrate to REST-based services. They also allow you to integrate to SOAP-based web services as an alternate option to generating Apex code from a WSDL.

These classes expose the general HTTP request/response functionality:

• Http Class. Use this class to initiate an HTTP request and response.
• HttpRequest Class: Use this class to programmatically create HTTP requests like GET, POST, PUT, and DELETE.
• HttpResponse Class: Use this class to handle the HTTP response returned by HTTP.

The following example shows an HTTP GET request made to the external server specified by the value of url for this  You have to make a HTTP Callout to the URL

Http http =new Http();
HttpRequest req =new HttpRequest();
req.setEndpoint('https://graph.facebook.com/webkul?access_token=CAAGIV8ndRDcBALpKhd5t5smOzFMv25HLpgqMqfZBhwZCJMbqPFW4aOZCXphud9tc7w9EEw0vBvRooZB7idLHLK3LkzS0pQP63pysUUZA7We5EV8IqZAsj7WwEhXf97C34aDKyaKW8lyvihyxl2duEpMjuHGs7LlsyPEZAwSJjykSpomgALOdvZBV');
req.setmethod('GET');
HttpResponse res = http.send(req);
String str = res.getbody();
System.debug(str);

Output

{
   "id": "285021323071",
   "about": "https://store.webkul.com . WebKul Store is the largest collection of open source plugins , we build best marketplace and openERP connectors in the world .",
   "awards": "Best E-commerce Marketplace \n\nBest E-commerce OpenERP connector",
   "can_post": true,
   "category": "Software",
   "checkins": 0,
   "company_overview": "https://store.webkul.com/ WebKul Software Private limited is an ISO certified design and development company working on e-commerce and ERP from almost five years .We have served more than 1000+ e-commerce store world-wide and our modules are functioning more than 20000+ store world wide  .We have a very dedicated team on Opencart , Magento and Prestashop . So we understand e-commerce very deeply . We have developed some very complex solutions like from drop-shipping solutions to multi vendor marketplace  With their connection to our ERP programme .",
   "cover": {
      "cover_id": "10153641288963072",
      "offset_x": 0,
      "offset_y": 0,
      "source": "https://scontent.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/s720x720/15772_10153641288963072_644429492176708130_n.png?oh=df373f59bca9f7a26c353051d2940d18&oe=565685DB",
      "id": "10153641288963072"
   },
   "has_added_app": false,
   "is_community_page": false,
   "is_published": true,
   "likes": 7100,
   "link": "https://www.facebook.com/webkul",
   "location": {
      "city": "Noida",
      "country": "India",
      "street": "A-67 2nd Floor Sector 63 ",
      "zip": "201301"
   },
   "name": "WebKul",
   "parking": {
      "lot": 0,
      "street": 0,
      "valet": 0
   },
   "phone": "(+1)408-215-2638 ",
   "talking_about_count": 79,
   "username": "webkul",
   "website": "https://store.webkul.com/",
   "were_here_count": 0
}

Make sure you add ‘https://graph.facebook.com’ to Remote Site Settings to whitelist the URL.

Refer the below url for tips on parsing in Apex :- http://json2apex.herokuapp.com/

For Parsing in Apex Use the below class

public class JSON2Apex {

    public String id;
    public String about;
    public String awards;
    public Boolean can_post;
    public String category;
    public Integer checkins;
    public String company_overview;
    public Cover cover;
    public Boolean has_added_app;
    public Boolean is_community_page;
    public Boolean is_published;
    public Integer likes;
    public String link;
    public Location location;
    public String name;
    public Parking parking;
    public String phone;
    public Integer talking_about_count;
    public String username;
    public String website;
    public Integer were_here_count;

    public class Parking {
        public Integer lot;
        public Integer street;
        public Integer valet;
    }

    public class Location {
        public String city;
        public String country;
        public String street;
        public String zip;
    }

    public class Cover {
        public String cover_id;
        public Integer offset_x;
        public Integer offset_y;
        public String source;
        public String id;
    }

    
    public static JSON2Apex parse(String json) {
        return (JSON2Apex) System.JSON.deserialize(json, JSON2Apex.class);
    }
    
    }

You can use this class, and deserialize the JSON by

JSON2Apex myClass = JSON2Apex.parse(str);

Now the Full code like this

Http http =new Http();
HttpRequest req =new HttpRequest();
req.setEndpoint('https://graph.facebook.com/webkul?access_token=CAAGIV8ndRDcBALpKhd5t5smOzFMv25HLpgqMqfZBhwZCJMbqPFW4aOZCXphud9tc7w9EEw0vBvRooZB7idLHLK3LkzS0pQP63pysUUZA7We5EV8IqZAsj7WwEhXf97C34aDKyaKW8lyvihyxl2duEpMjuHGs7LlsyPEZAwSJjykSpomgALOdvZBV');
req.setmethod('GET');
HttpResponse res = http.send(req);
String str = res.getbody();
System.debug(str);

JSON2Apex myClass = JSON2Apex.parse(str);

System.debug(myClass);

Now, the Output after deserialize the JSON given below

Best E-commerce OpenERP connector, can_post=true, category=Software, checkins=0, company_overview=https://store.webkul.com/ WebKul Software Private limited is an ISO certified design and development company working on e-commerce and ERP from almost five years .We have served more than 1000+ e-commerce store world-wide and our modules are functioning more than 20000+ store world wide  .We have a very dedicated team on Opencart , Magento and Prestashop . So we understand e-commerce very deeply . We have developed some very complex solutions like from drop-shipping solutions to multi vendor marketplace  With their connection to our ERP programme ., cover=Cover:[cover_id=10153641288963072, id=10153641288963072, offset_x=0, offset_y=0, source=https://scontent.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/s720x720/15772_10153641288963072_644429492176708130_n.png?oh=df373f59bca9f7a26c353051d2940d18&oe=565685DB], has_added_app=false, id=285021323071, is_community_page=false, is_published=true, likes=7100, link=https://www.facebook.com/webkul, location=Location:[city=Noida, country=India, street=A-67 2nd Floor Sector 63 , zip=201301], name=WebKul, parking=Parking:[lot=0, street=0, valet=0], phone=(+1)408-215-2638 , talking_about_count=73, username=webkul, website=https://store.webkul.com/, were_here_count=0]

Note** You can make Facebook Graph url like this :- https://graph.facebook.com/YOUR_PAGE_ID?access_token=YOUR_ACCESS_TOKEN