Скачать или смотреть How to Properly Upload Files in Express with Axios

Struggling with file uploads in Express using Axios? Discover how to successfully send files and form data with a clear, step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/71604864/ asked by the user 'choco' ( https://stackoverflow.com/u/18318003/ ) and on the answer https://stackoverflow.com/a/71606506/ provided by the user 'Muhammad Ashraf' ( https://stackoverflow.com/u/9232078/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Uploading Files in Express: A Common Challenge

When working with file uploads in a web application, developers often run into a variety of issues. One common question arises when using Express with Axios to upload files, specifically when the uploads don't seem to be processed correctly. If you've encountered a scenario where Express does not recognize file uploads, despite Postman working fine, you're not alone. Here’s how you can solve this problem and correctly send a file along with other form data.

Understanding the Problem

You want to upload an image file alongside other data (like login credentials) to an Express backend. Although tools like Postman allow for smooth file uploads, implementing the same functionality using Axios and FormData can be tricky. The key issue lies in the way the payload is structured and the headers are set.

What You Were Doing Wrong

Initially, you structured your Axios POST request as follows:

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

In this attempt, the problem resides in the way you are sending the form data. By wrapping the form in curly braces ({ form }), you inadvertently create an object rather than sending the form directly.

The Solution: Correcting Your Axios Request

To properly upload the file and associated data, follow this refined approach:

Use FormData Directly: Remove the curly braces around the form when sending it in the Axios request.

Set the Correct Headers: For file uploads, let the browser set the Content-Type header automatically when using FormData, to avoid issues with multipart form data.

Here’s the Corrected Code:

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

Key Points to Remember

FormData: Always use the FormData object correctly without additional braces that would convert it to an object.

Automated Headers: When using FormData, it's best to allow the environment to assign the correct Content-Type, which will include the proper boundaries for multipart data.

Testing: Always test your implementation after making changes to ensure the data is being sent as expected.

Conclusion

Uploading files can often be quite frustrating, especially for those new to handling this specifically in Express. By following the guidelines above, you can streamline your file upload process using Axios and improve your backend interaction. If you continue to experience issues, consider checking the server configurations or middleware that might affect file handling.

This clear, structured approach should equip you with the knowledge to handle file uploads efficiently while resolving common pitfalls.