Understanding ERR_INVALID_URL: Fixing Your Asynchronous Fetch Problems in Node.js

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The Problem at Hand

You may have written a series of asynchronous functions to get information about your location and query data from an API, but found that you’re receiving an ERR_INVALID_URL error when executing the getFlyByTime() function. Let’s break down the situation:

You are successfully obtaining the IP address and geolocation data.

However, when attempting to use that data to perform another fetch, you encounter the error.

What Causes the ERR_INVALID_URL Error?

The root cause of the ERR_INVALID_URL error in this context is that the myLocation variable is not being set properly before it's used in the getFlyByTime() function. Since myLocation is dependent on the previous function that fetches the geolocation data, it must be ensured that the operation is completed before you try to use the URL.

The Solution

To resolve this issue, you need to properly sequence your asynchronous functions. JavaScript’s await keyword can simplify this process significantly. Below, we’ll walk through the revised functions to demonstrate the correct flow.

Step-by-Step Fix

Creating a Helper Function for Fetch Calls
It’s a good practice to create a function that handles the fetch calls and can return JSON data. This way, you can manage errors more effectively.

[[See Video to Reveal this Text or Code Snippet]]

Refactoring Asynchronous Functions
Each asynchronous function should utilize await to ensure that the promise resolves before proceeding to the next operation.

[[See Video to Reveal this Text or Code Snippet]]

Sequencing the Operations
The key is to ensure you're not trying to access variables before they are set. Thus, the getFlyByTime() function becomes:

[[See Video to Reveal this Text or Code Snippet]]

Executing the Main Function
Finally, when you want to execute, simply call the getFlyByTime() function and handle the result or error accordingly.

[[See Video to Reveal this Text or Code Snippet]]

Testing Your Changes

After implementing these changes, rerun your code. You should see improved results without the ERR_INVALID_URL error, assuming your URLs are correct.

Conclusion

Now get coding and make those API calls seamless!