How to Fix the Error: Router.use() requires a middleware function but got a in Node.js and Express

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Understanding the Error

What Does the Error Message Mean?

The error message states:

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This means the use() method was called incorrectly, which prevents the API from starting correctly.

Identifying the Problem in Your Code

Let’s go through the provided code snippets to see where the issue lies.

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The Correct Approach

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To this:

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Summary of the Solution

To fix the issue:

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Ensure all other middleware and routes are correctly defined.

Why Does This Matter?

Final Words

If you find yourself lost in the stack trace given by errors, take a moment to learn how to interpret it, as it can often lead you to the root of the problem much faster.

Now go forth and build amazing APIs with confidence!