Send JSON in Http Get request with Angular.

service.ts

import {Http, Headers, RequestOptions, Response, ResponseContentType, URLSearchParams} from "@angular/http";

@Injectable()
export class DocumentService
{
  constructor(private http: Http)
  {

  }
  loadDocuments(folderId: number, currentPage: number) : Observable<Response>
  {
    let headers = new Headers({
      'Content-Type' : 'application/json',
      'Accept': 'application/json'
    });
    let requestOptions = new RequestOptions({headers});

    requestOptions.params = this.getFilterData(currentPage);

    let path = "folders/"+folderId+"/documents";

    return this.http.get(appConstants.apiUrl+ path, requestOptions );
  }
  private getFilterData(currentPage: number) : any
  {
    let params: URLSearchParams = new URLSearchParams();
    let filterValue = JSON.stringify( {currentPage: currentPage, pageLimit: 50 });

    params.set('filter', filterValue);

    return params;
  }
}