BoxSearchContentResponseParser.cls

//this class is created to parse response from box while searching any content on box
public class BoxSearchContentResponseParser {
    public Integer total_count {get;set;} 
    public List<Entries> entries {get;set;} 
    public Integer limit_Z {get;set;} // in json: limit
    public Integer offset {get;set;} 
    public class Entries {
        public String type_Z {get;set;} // in json: type
        public String id {get;set;} 
        public String etag {get;set;} 
        public String name {get;set;}
        public Parent parent {get;set;} 
    }
    public class Parent {
        public String type_Z {get;set;} // in json: type
        public String id {get;set;} 
        public Object sequence_id {get;set;} 
        public Object etag {get;set;} 
        public String name {get;set;} 
    }
}

BoxUtility.cls

public class BoxUtility{
    public static BoxSearchContentResponseParser SearchContentOnBox(string searchstr,string searchType,string folderidForSearch,string access_token){
        BoxSearchContentResponseParser searchResults = new BoxSearchContentResponseParser ();
        //searchType specify if you want to search on file or folder.
        //for folder search specify searchType as 'folder' and for searching files specify searchType as 'file'
        //searchstr is text which you want to search
        string endPointUrl='https://api.box.com/2.0/search?query='+searchstr+'&type='+searchType;
        //specify folderidForSearch if you want to search in specific folder
        //if you want to search accross all folder then donot specify ancestor_folder_ids parameters
        if(folderidForSearch !='' && folderidForSearch!=null && folderidForSearch!='0'){
            endPointUrl = endPointUrl + '&ancestor_folder_ids='+folderidForSearch;
        }
        endPointUrl = endPointUrl + '&fields=name,parent,type,id&limit=200';
        system.debug('***endPointUrl:'+endPointUrl);
        Httprequest req = new HttpRequest();
        req.setEndpoint(endPointUrl);
        req.setMethod('GET'); 
        req.setHeader('Authorization', 'Bearer '+access_token);
        req.setHeader('Content-Type','application/json');
        HttpResponse response = new HttpResponse();
        try{
            Http h1 = new Http();
            response= h1.send(req);
            
            system.debug('response *** '+response.getBody());
            system.debug('***response.getStatusCode():'+response.getStatusCode());
            //200 will be returned with total count for match
            
            if(response.getStatusCode() == 200){
                string resJSON =response.getBody();
                resJSON = resJSON.replaceAll('type','type_Z');
                searchResults = (BoxSearchContentResponseParser )System.JSON.deserialize(resJSON,BoxSearchContentResponseParser.class);
                system.debug('***searchResults:'+searchResults);
            }
        }catch(exception ex){
            system.debug('****some error occured in searchContentOnBox method:'+ex.getMessage());
        }
        return searchResults;
    }
}