How to retrieve and store API response data from external service in JavaScript

Other Questions RapidAPI
1

I’m working on a JavaScript project where I’m trying to fetch information from an external API service and use that data in other parts of my code. Here’s what I’ve written so far:

const request = require("request");

const options = {
  method: 'GET',
  url: 'https://weather-api.p.rapidapi.com/current/location',
  qs: {
    city: 'London',
    date: '2023-05-15'
  },
  headers: {
    'x-rapidapi-key': 'your-api-key-here',
    'x-rapidapi-host': 'weather-api.p.rapidapi.com'
  }
};

request(options, function (error, response, body) {
  if (error) {
    console.error('Request failed:', error);
    return;
  }
  
  console.log(body);
});

The issue I’m facing is that when I try to use the response data outside of the callback function, I get undefined. I’m looking for a way to save this data for use in different functions across my application. What would be the best approach to solve this problem?

2

Your issue is JavaScript’s async behavior. When you call the request function, your code keeps running before the API response comes back - that’s why variables show as undefined outside the callback. Ditch the old request library and use fetch instead. Wrap it in a Promise-based function, then handle the data with .then() or use async/await for cleaner code. For storing data across your app, you’ve got a few options: stick it in a global variable, set up basic state management, or use localStorage if you need it to persist between sessions. Bottom line: make sure your code waits for the API response before trying to use the data.

3

You’re hitting the classic async JavaScript problem. Your request fires off, but the rest of your code keeps running without waiting for the response. That’s why you get undefined when you try to access the data outside the callback. I’ve run into this tons of times in production apps. Best fix? Ditch the callback approach and switch to Promises. Wrap your request in a function that returns a Promise, then you can chain operations or use async/await. Much cleaner. For storing the data across your app, set up a simple module pattern to cache the API response. Saves you from making the same API call over and over, plus you get one central place to grab the data. If multiple components need to react when the data changes, look into a basic observer pattern.

4

I deal with this exact scenario daily. Instead of wrestling with callbacks, Promises, and manual data storage, just automate the whole thing.

Latenode grabs weather API data, transforms it however you need, and stores it automatically. No more undefined variables or async headaches. Set up a workflow that triggers when you need data.

The real power comes when your app scales. Need data from 5 different APIs? Want to combine weather data with user preferences from another service? Manual JavaScript gets messy fast.

I switched our data integration to automation workflows and never looked back. One weather API call now triggers database updates, sends notifications, and syncs with other services. No callback functions or state management.

Set up your API workflow once and it handles everything automatically. Way cleaner than managing async JavaScript across multiple functions.

5

u got it! the async stuff is tripping ya up. use async/await to make it smoother, and swap out request for axios or fetch. just wrap ur code in a function that returns the response so u can access it all over ur app.

6

quick tip - set up a simple cache object for your api responses. just use const apiCache = {} and store the parsed json there after each request finishes. saves u from making the same calls over and over, plus u can grab that data anywhere without wrestling with async stuff each time.