Скачать или смотреть Resolving the Multipart: Boundary not found Error in React with Axios File Uploads

Learn how to effectively handle file uploads in React using Axios, resolving the `Multipart: Boundary not found` error with a step-by-step guide.
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Resolving the Multipart: Boundary not found Error in React with Axios File Uploads

If you're a developer working with React, you may have encountered various file upload issues when using Axios to send your files to a backend server. One common error that could pop up is the dreaded Multipart: Boundary not found error. This problem often arises due to incorrect configurations in your Axios request or improper handling of file inputs. In this guide, we will break down the problem and provide a clear solution to help you resolve this issue once and for all.

The Problem

You may be facing a situation where your code works perfectly fine in Postman, but it fails when executed in your React application. Specifically, you're receiving a 400 error from the server indicating that something is not right with your request. One of the primary suspects here is that your multipart form-data is not being constructed correctly, leading to the Boundary error.

Diagnosing the Issue

Here's a checklist to diagnose potential problems in your code:

Authorization Header: It's crucial to ensure that your authorization token is being passed correctly. This is especially important if you are using a Bearer token.

Content-Type Header: While it's common to set content-type in your headers, it might not be necessary when sending FormData, as the browser usually handles boundary creation.

File Input Handling: Ensure you're capturing the file correctly from the input element.

Solutions: Step-by-Step Guide

Here's how to resolve the issue and ensure that your file uploads work as intended.

Step 1: Check Your Authorization Token

Make sure that you're passing the token correctly in the request headers. If you're using a Bearer token, it should be prefixed with the word Bearer.

Update your config header as follows:

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

Step 2: Update the Handle Upload Function

In your handleUpload function, ensure that you're sending the FormData object correctly. Remove the curly braces around formData while sending the request to Axios:

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

Step 3: Correct the File Input Handling

When handling the file input, make sure that you're using e.target.files[0] to capture the selected file from the input. Replace your input’s onChange method like this:

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

Conclusion

By following these steps, your file upload functionality using Axios in a React application should work seamlessly without the Multipart: Boundary not found error. Remember that careful handling of the authorization token and proper construction of FormData are keys to successful file uploads.

Feel free to reach out to us if you have further questions or run into other issues. Happy coding!