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Learn how to handle asynchronous API calls in `Vue.js` using `axios`. This guide breaks down a common issue and its solution for clearer understanding.
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This video is based on the question https://stackoverflow.com/q/67228104/ asked by the user 'BibDev' ( https://stackoverflow.com/u/10041909/ ) and on the answer https://stackoverflow.com/a/67228189/ provided by the user 'papillon' ( https://stackoverflow.com/u/8993709/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Vue.js Asynchronous API Calls with Axios

In the world of modern web development, making asynchronous API calls is a fundamental skill, particularly when using frameworks like Vue.js. When making such calls, many developers run into common issues that can leave them scratching their heads. Recently, a developer encountered a problem trying to handle responses in Vue.js with axios. Let’s unpack the issue they faced and how to resolve it effectively.

The Problem: Handling Responses in Nested Async Functions

The developer tried to call an API using axios, but while one piece of code worked perfectly, another version did not return the expected response. Here’s a quick look at both versions they implemented:

First Version: The Working Code

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In this first version, the method worked as expected, logging the response to the console. The structure is straightforward and utilizes the asynchronous nature of the function effectively.

Second Version: The Problematic Code

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

In the second version, the key issue lay in the sendDatas function, where it called callApi, but the response was logged as undefined.

The Solution: Return the Promise Correctly

The fix involves ensuring that the promise from the callApi function is returned so that the sendDatas function can access its response. Here’s how to modify the second version to function as intended:

Corrected Code

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

Key Points to Note

Returning a Promise: It's crucial to return the promise from the callApi function. Without this, sendDatas can't access the response.

Proper Use of async/await: In this context, async and await aren't necessary since we’re already using then and catch for handling results. You can streamline your code by removing those keywords to make it cleaner.

Conclusion

Asynchronous programming can sometimes lead to moments of confusion, especially in environments like Vue.js. By understanding how to properly return promises and structure your calls, you can navigate through these challenges more effectively. Remember to return your promises where necessary to keep everything in sync. Happy coding!