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Learn the best practices for using `axios` with Vue Router Navigation Guards. This guide will clarify how to access your HTTP client in route files.
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This video is based on the question https://stackoverflow.com/q/65492471/ asked by the user 'Franz' ( https://stackoverflow.com/u/11549155/ ) and on the answer https://stackoverflow.com/a/65493889/ provided by the user 'jmbmage' ( https://stackoverflow.com/u/3180309/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Use axios in Vue Router Navigation Guard

When working with Vue.js and Vue Router, you may encounter a common issue: how to use your configured axios instance inside the route files. If you've set up axios to be used globally in your Vue application, it can be tricky to access it within a Vue Router navigation guard or in other parts where the this context isn't what you would expect.

Let’s dive into the problem and then explore a solution that makes axios available in Vue Router for seamless HTTP requests!

The Challenge

In a typical scenario, you would like to make HTTP requests in your navigation guards to check authentication status or fetch session information before routing to a new view. However, the this context inside your route definitions is not the same as that of a Vue component.

This means that trying to access your axios instance using this.$http inside the route definitions won’t work as expected. Here’s the breakdown:

In Route Files: this points to the router instance rather than your Vue component.

In Vue Components: this correctly refers to the current component instance, allowing access to your registered axios instance.

To demonstrate this, you can run console.log(this) in both your routes file and a Vue component, and you will see a significant difference in the output.

The Solution

To resolve this issue, you can modify your axios configuration. The solution is to create a standalone axios instance that can be imported into both your Vue components and route files. Here's a step-by-step guide on how to achieve this.

Step 1: Modify axios.js

You'll want to make a slight adjustment to your axios.js file to export your instance:

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

Step 2: Import the Instance in routes.js

Now that you have exported your Axios instance, you can easily import it into your route definitions:

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

Benefits of This Approach

Consistent Access: By using the exported Axios instance, you maintain a single point of configuration for axios.

Clear Context: This method allows you to correctly access the axios instance without worrying about the this context.

Reuse Across Files: You can now reuse the same Axios instance across various parts of your application, ensuring consistent behavior.

Conclusion

By modifying your axios setup and exporting the instance, you can utilize axios effectively within Vue Router navigation guards. This approach not only simplifies your code but also enhances its readability and maintainability.

If you follow these steps, you'll be able to execute HTTP requests from route definitions without any hassle. Happy coding!