public with sharing class calloutViewer_Controller {
                public String requestEndpoint {get;set;}
                public String accountodel {get;set;}
                public String createnewtask {get;set;}
                public String requestMethod {get;set;}
                public String requestBody {get;set;}
                public String responseStatus {get;set;}
                public Integer responseStatusCode {get;set;}
                public String responseBody {get;set;}
                public RFAPI.responseResource2 response2 {get;set;}
                deserializedQuestions {get;set;}
                public List<RFAPI.questionResource2> deserializedQuestions2 {get;set;}
                public void callout2(){
                httpResponse res2 = RFAPI.callout2(requestMethod, requestEndpoint, requestBody);
                responseStatus = res2.getStatus();
                responseStatusCode = res2.getStatusCode();
                responseBody = res2.getBody();


          public void deserializeQuestions2(){
                if ( string.isNotBlank(responseBody) ){
                    response2 = (RFAPI.responseResource2)JSON.deserialize(responseBody,RFAPI.responseResource2.class);
                    deserializedQuestions2 = response2.items2;
                }

            }

public with sharing class RFAPI {
        public static String BASE_URL = 'My api url';



        public static httpResponse callout2(String httpMethod, String endpoint, String body){

            String token = 'My API token';
            httpRequest req = new httpRequest();
            req.setHeader('X-RFToken', token);
            req.setMethod(httpMethod);
            req.setEndpoint(endpoint);






        system.debug(res2.toString());
        system.debug(res2.getBody());
        return res2;

    }

  public static responseResource2 deserialize(httpResponse res2){
        return (responseResource2)JSON.deserialize(res2.getBody(),responseResource2.class);

    }


    public class responseResource2 {
        public List<questionResource2> items2{get;set;}
    }

     public class questionResource2 {
         public Timestamps timestamps {get;set;}
         public Counts counts {get;set;}
         public Entity entity {get;set;}

    }


    public class Timestamps {
        public String firstSeen {get;set;}
        public String lastSeen {get;set;}
    }

    public class Entity {
        public String id {get;set;}
        public String name {get;set;}
        public String type_Z {get;set;}
    }

    public class Counts {
        public Integer returned {get;set;}
        public Integer total {get;set;}
    }

<apex:pageBlockSection columns="1" title="JSON Deserializer" rendered="{!deserializedQuestions2 != null}" collapsible="false" >
            <apex:pageBlockTable value="{!deserializedQuestions2}" var="i" >
                <apex:column headerValue="Owner" style="width:100px;" >
                </apex:column>
                <apex:column headerValue="Question Id" style="width:75px;" >
                    <apex:outputText value="{!i.timestamps.firstseen}" />
                </apex:column>
                <apex:column headerValue="Creation Date" style="width:75px;" >
                    <apex:outputText value="{!i.timestamps.lastseen}" />
                </apex:column>
                <apex:column headerValue="View Count" style="width:75px;" >
                    <apex:outputText value="{!i.entity.id}" />
                </apex:column>
                <apex:column headerValue="Answer Count" style="width:75px;" >
                    <apex:outputText value="{!i.entity.name}" />
                </apex:column>
                <apex:column headerValue="Score" style="width:50px;" >
                    <apex:outputText value="{!i.entity.type_Z}" />
                </apex:column>
                <apex:column headerValue="Score" style="width:50px;" >
                    <apex:outputText value="{!i.counts.returned}" />
                </apex:column>
                <apex:column headerValue="Score" style="width:50px;" >

                </apex:column>
            </apex:pageBlockTable>