How to Fix the useQuery Not a Function Error in Tanstack React Query

Learn how to resolve the common TypeError: useQuery is not a function in Tanstack React Query with our step-by-step guide.
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Understanding the useQuery Issue in Tanstack React Query

If you've been working with Tanstack React Query and encountered the frustrating TypeError stating that useQuery is not a function, you're not alone. This error can occur even when everything seems to be imported correctly. In this guide, we'll explore the root cause of this error and provide a simple solution to ensure that your application runs smoothly.

The Problem: TypeError with useQuery

As a developer, you may come across issues that arise from improper function references, especially when dealing with external libraries. In this case, your code throws the following error:

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

This error usually occurs in the context of React Query when the function you are trying to use is either not imported correctly or is being called in a way that is not compatible with how it's designed to operate. In our provided code, the use of useQuery seems correct at first glance, yet it still throws an error. Let's dig deeper to find a solution.

Solution: Properly Referencing queryFn

The cause of the error can be attributed to how the getStripeProducts function is referenced within the useQuery call. You want to pass the function as a reference rather than invoking it immediately. Here's how you can do that:

Original Code

Here's a simplified version of the original code that leads to a TypeError:

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

While we've imported useQuery correctly, the way queryFn is defined can lead to confusion. The getStripeProducts function needs to be referenced correctly to avoid triggering the error.

Modified Code

To fix the issue, update your code so that it refers to getStripeProducts as a function reference:

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

Why This Matters

When you provide a function directly to React Query’s useQuery, it expects a reference that it can call when needed. If you inadvertently call the function (e.g., by using parentheses), it won’t be able to handle it as intended, leading to the error you experienced. Following this convention will help ensure a smooth functioning of your application and prevent similar issues in the future.

Conclusion

The useQuery not being recognized as a function in Tanstack React Query can be a frustrating obstacle for developers. However, by understanding how to correctly reference functions, you can easily resolve the issue. Remember to always pass function references instead of calling them immediately when working with hooks.

By following these best practices, you’ll streamline your development process and significantly reduce the chances of encountering similar errors. Happy coding!