Скачать или смотреть Fixing the "Request failed with status code 404" in Axios with Express: A Guide for New Developers

Explore how to resolve the common "Request failed with status code 404" error in your Express app using Axios, while learning the best practices for routers and controllers.
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Fixing the "Request failed with status code 404" in Axios with Express: A Guide for New Developers

As a new developer, diving into backend development with Node.js, Express, and Axios can feel overwhelming, especially when encountering errors like the infamous 404 - Not Found. If you’ve found yourself facing this issue while setting up routers and controllers in your Express application, you’re not alone! In this guide, we’ll unveil the causes behind this error and provide you with a clear, step-by-step solution.

Understanding the Problem

In your Express application, you've set up an authentication router that’s supposed to handle login requests. However, upon sending a POST request to the /login endpoint, you receive a 404 error. Here’s the exact error message you might see in your console:

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

This error indicates that the endpoint you've defined is not being recognized properly. Let’s break down why this happens and how to fix it.

Breaking Down the Code

Your Express Setup (app.js)

You have set up the foundational server code in app.js, where you've defined the routes for your application:

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

Here, you are telling Express to use the authRouter for any requests made to the /login endpoint.

The Auth Router (auth.js)

Within your auth.js router file, you defined your login POST route as follows:

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

The Challenge

The challenge arises from mixing how you've defined your routes. The router is currently expecting a call to /login/login/, but you want to call /login/. This mix-up leads to the 404 error.

The Solution

Adjusting the Auth Router

To resolve this error, you need to restructure your router. Instead of setting your route to respond to /login, change it to respond to / within the router file. Here’s what your auth.js should look like:

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

What This Change Does

By changing router.post('/login', controller.login); to router.post('/', controller.login);, you are telling Express that you want to respond to requests made to /login directly.

Now, when your application calls http://localhost:3000/login/, the router will properly recognize the request and execute the login functionality as intended.

Putting It All Together

Update the auth.js router as shown above.

Ensure that your app.js retains the use of authRouter for the /login endpoint.

Test your application by sending a POST request to http://localhost:3000/login/. You should no longer see the 404 error, and your login logic should execute successfully.

Conclusion

By understanding how routing works in Express, especially when integrating with Axios, you can avoid common pitfalls like the 404 - Not Found error. Always ensure that your endpoint definitions align correctly between your main application and the routers. With practice and persistence, you’ll soon gain confidence in building robust applications. Happy coding!