Скачать или смотреть Troubleshooting Axios 404 Error in MERN Stack

Learn how to resolve a 404 error when making an Axios POST request in your MERN stack application.
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When working with a MERN (MongoDB, Express, React, Node.js) stack, encountering a 404 error while making an Axios POST request can be quite puzzling. This common issue usually indicates that the resource you are trying to access cannot be found on the server. Below, we will outline some potential reasons for this error and guide you on how to resolve it.

Understanding the Error

AxiosError: Request failed with status code 404

This error message suggests that your Axios POST request to http://localhost:5000/posts is not able to find the endpoint on the server. There are several potential reasons for this issue:

Incorrect Route Definition: Make sure that the route /posts is correctly defined in your Express server.

Server Not Running: Verify that your server is running and listening on port 5000.

Client-side URL Error: Ensure that you are making the request to the correct URL from your React application.

Step-by-Step Troubleshooting

Verify Route Definition

Ensure that your Express server has the /posts route correctly defined. Your code might look something like this:

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

If this route is defined in a separate file, make sure the file is correctly imported and used in your main server file.

Check if Server is Running

Ensure that your server is actively running and listening on the port. You should see a console log message indicating that the server is up:

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

Verify Client-Side URL

Ensure that your Axios POST request in your React application is correctly pointing to the server URL:

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

Recap

A 404 error when making an Axios POST request in a MERN stack usually stems from incorrect route definitions, server issues, or URL misconfigurations. By following the steps outlined above, you can efficiently debug and resolve the issue to ensure smooth communication between your frontend and backend.

By paying close attention to these areas, you can quickly identify the root cause of the 404 error and implement effective solutions.