Troubleshooting the Uncaught TypeError: Fixing CoinGecko API Data Retrieval in JavaScript

Learn how to resolve the `Uncaught TypeError` when dealing with API responses in JavaScript. We provide a step-by-step solution to accurately fetch and display cryptocurrency prices from the CoinGecko API.
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This video is based on the question https://stackoverflow.com/q/75587537/ asked by the user 'BLBug' ( https://stackoverflow.com/u/12156501/ ) and on the answer https://stackoverflow.com/a/75588629/ provided by the user 'Jordy' ( https://stackoverflow.com/u/12715723/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the Uncaught TypeError: Fixing CoinGecko API Data Retrieval in JavaScript

When working with APIs in JavaScript, such as the CoinGecko API, encountering errors can be a frustrating experience, especially when you're trying to pull in important data like price information. One common error developers encounter is the Uncaught TypeError: Cannot read properties of undefined (reading 'usd'). In this guide, we'll explore this issue, understand why it happens, and provide a clear solution.

Understanding the Problem

In your script, you are attempting to retrieve the price of a cryptocurrency by making an API call to CoinGecko. However, when the AJAX call is made, the data structure of the response does not match your expectations, leading to the error message. Specifically, you are trying to access a property that doesn’t exist in the response object.

The Code in Question

Here's the relevant part of your JavaScript code:

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

In this fragment, you're attempting to access response.steamExchange.usd, but steamExchange does not exist within the returned response object.

The Solution

To resolve this issue, you need to change the way you access the property of the response object. Specifically, you should replace the line that is causing the error with the following:

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

This modification ensures that you are referencing the correct property name as it appears in the API response.

Complete Fixed Code Example

Here’s the complete, revised version of your script, which also includes a second HTML element where you can multiply and display the price by 550:

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

HTML Structure

Ensure your HTML structure supports this JavaScript by having elements with IDs that match:

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

Final Thoughts

Errors in JavaScript, especially related to undefined properties, can often lead to confusion. By understanding the structure of the data returned by APIs and carefully checking for correct property names, you can avoid similar issues in the future. With these adjustments made, you should be able to retrieve the cryptocurrency price and perform calculations without any further errors.

Whether you're a novice or an experienced developer, troubleshooting API calls is a crucial skill that enhances your programming toolkit. Happy coding!

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