Resolving the Redirected when going from '/login' to '/' via a navigation guard Error in Vue.js

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In this guide, we'll walk through the possible causes of this error and the steps you can take to resolve it. Let's dive in!

What is a Navigation Guard?

Before troubleshooting the error, it’s essential to know what a navigation guard is. In Vue Router, navigation guards are functions that allow you to control the navigation between routes. They can be used to:

Protect routes that require authentication

Redirect users based on their authentication status

Perform additional checks before allowing navigation

In the provided code, the navigation guards manage user authentication, ensuring that users who are not logged in are redirected to the login page and logged-in users are redirected away from the login page.

Problem Breakdown

In the example code, you encounter an issue where navigating from the /login route to the root path / triggers the error. Here are the relevant segments affecting navigation:

Router Configuration

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

Auth Guard

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

Understanding the Error

The error appears because of the following reasons:

Multiple Calls to next(): Each of your conditionals in the navigation guard might execute the next() function independently, resulting in calls to next() multiple times during a single route change. This is why you see the error stating that you are redirected when going from /login to /.

Improper Redirect Path: The path // is likely a typo and should instead be a single /, which is the correct root path.

Static loggedIn value: The loggedIn variable is evaluated only once when the router is created. If a user logs in after the initialization, the state won’t reflect this change until the page is refreshed.

Solution Steps

Let’s resolve the error with the following approaches:

1. Refactor the next() Calls

Modify your navigation guard to ensure that next() is called just once per route navigation by using return statements effectively.

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

2. Correct the Redirect Path

Ensure that the path defined in the redirect is correctly set to "/" instead of "//".

3. Dynamic Check for loggedIn

Set the value for loggedIn within the guard to accurately reflect the authentication state every time a route attempt occurs.

Conclusion