Скачать или смотреть Solving the 404 Error with Correct Route Handling in Express.js

Learn how to fix the `404 error` in your Express.js application while ensuring proper route usage. This guide breaks down the solution step-by-step for clarity.
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This video is based on the question https://stackoverflow.com/q/71815485/ asked by the user 'marki00' ( https://stackoverflow.com/u/12722166/ ) and on the answer https://stackoverflow.com/a/71815540/ provided by the user 'pzaenger' ( https://stackoverflow.com/u/2436655/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the 404 Error with Correct Route Handling in Express.js

Dealing with a 404 error in your Express.js application can be incredibly frustrating, especially when you’re certain that your routing logic is in place. If you’ve been pulling your hair out trying to find a fix, you’re not alone! In this post, we’ll discuss a common scenario that leads to 404 errors, and how to resolve it effectively.

Understanding the Problem

In your Express.js application, you've defined routes using the following structure:

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

However, the route defined in your watch.js file is:

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

Why Are You Getting a 404 Error?

The reason you're encountering a 404 error specifically for the /watch/:anime/:id route lies in the way you've set up your routing. When you include the :anime and :id parameters in both app.js and watch.js, you unintentionally create a misalignment that throws the system off.

This results in a combined route that looks like this:

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

As a consequence, when you attempt to access your intended route, the server doesn’t find a match and returns a 404 error.

The Solution

To resolve this issue, you need to modify the routing in your app.js file to match the way you've defined your paths in watch.js. Here’s how to implement the fix:

Step 1: Modify the Route in app.js

Change the routing line in your app.js file from:

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

to:

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

Step 2: Update watch.js

Your route in watch.js does not need any changes, as it is already correctly defined:

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

This change means that when you access a URL like /watch/naruto/1, your router will correctly identify naruto as the anime and 1 as the id.

Final Code Snippet

After these adjustments, your code will look as follows:

app.js

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

watch.js

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

Conclusion

By making a simple adjustment to your Express.js routing setup, you can resolve the pesky 404 error that has been causing you headaches. Remember, clarity in your route definitions can save you a lot of trouble while working on your applications. If you ever run into similar issues, take a closer look at how you've organized your routes, and happy coding!