How to transfer data received by nodejs/request to another file

let express = require("express");

let request = require("request");

const $url = "https://api2.sktelecom.com/weather/current/hourly";

let $lat   = 37.539079;

let $lon   = 126.990669;
const $key = "751d8762-5bcf-42b2-9121-f4bbeb68976d";

let $api = $url + "?lat=" + $lat + "&lon=" + $lon + "&appkey=" + $key;

request($api, function (error, response, body) {

    let json = JSON.parse(body);
    let weather = json.weather.hourly;

}