How to use the querystring.stringify function in querystring

async function getData(query) {
    let options = {
        url: apiConfig.occurrenceSearch.url + '?' + querystring.stringify(query),
        method: 'GET',
        fullResponse: true,
        json: true
    };
    let response = await request(options);
    if (response.statusCode !== 200) {
        // TODO log error
        throw 'Internal server error getting data';
    }
    return response.body;
}

function get_gif(tags, func) {
	var params = {"api_key": "dc6zaTOxFJmzC", "rating": "r", "format": "json","limit": 1 };
	var query = qs.stringify(params);
	if (tags !== null) {query += "&tag=" + tags.join('+')}
	var request = require("request");
	request("http://api.giphy.com/v1/gifs/random?" + query, function (error, response, body) {
		if (error || response.statusCode !== 200) {bot.sendMessage(msg, "There was an error getting a gif");console.log(errorC(error));}
		else {var responseObj = JSON.parse(body); func(responseObj.data.id);}
	}.bind(this));
}

function createUrlFromEndpointAndOptions (endpoint, options) {
  const query = qs.stringify(options);
  const baseURL = `${host}${endpoint}`;
  return query ? `${baseURL}?${query}` : baseURL;
}

post(url, data, options = {}) {
    options.method = options.method || 'POST';
    if ('object' === typeof data && undefined !== options.postType && 'json' === options.postType) {
      data = JSON.stringify(data);
      options.postContentType = options.postContentType || 'application/json';
    } else if ('object' === typeof data) {
      data = querystring.stringify(data);
    }
    options.postData = data;
    return this.request(url, options);
  }

get(path: string, query?: {}) {
    let params = '';
    if (query && Object.keys(query).length) {
      params += '?' + querystring.stringify(query);
    }
    const headers = this.makeHeader('/v1'.concat(path, params));
    return super.get(path, query, headers);
  }

get: function (path, queryParams, userSecret) {
      const headers = _getHeaders({ userSecret })
      queryParams = querystring.stringify(queryParams)
      return _dispatchAxiosRequest('GET', path + '?' + queryParams, headers, null)
    },

export function ticketString({corpus, ...params}: KytheTicket) {
  if (params.root === '') delete params.root;
  return `kythe://${corpus}?` + stringify(params, '?') as KytheTicketString;
}

module.exports = function webmapUrl(location, params) {
  if(params === undefined)
    params = {}


  var url = "https://www.arcgis.com/home/webmap/viewer.html"
  if(params.marker === undefined || params.marker === null) {
    params.marker = location.x + ";" + location.y + ";;Ping;;Ping";
  }
  if(params.level === undefined || params.level === null) {
    params.level = 16;
  }

  return url + "?" + qs.stringify(params);
}

getAuthorizationUrl : function(params) {
    params = _.extend({
      response_type : "code",
      client_id : this.clientId,
      redirect_uri : this.redirectUri
    }, params || {});
    return this.authzServiceUrl +
      (this.authzServiceUrl.indexOf('?') >= 0 ? "&" : "?") +
      querystring.stringify(params);
  },