Fixing req.file is undefined Error with Multer for Image Upload in Node.js

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Understanding the Problem

The Scenario

Key Code Snippets

React Code for Sending File

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Input Element for File Upload

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Solution: Resolving the undefined Error

After thorough debugging, the solution to this problem was simpler than expected. Here’s what you need to do:

Step 1: Remove Conflicting Middleware

What to Do:

Check if you have included any middleware like fileUpload() in your code before creating the imagefilter route. If you have, remove it.

Example:
If you have this line in your server setup:

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

Remove or comment it out before defining your Multer-based routes.

Step 2: Verify Your File Input Name

Final Thoughts