Resolving the NaN Error in Node.js When Using Multiple Parameters

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The Problem: Understanding the NaN Error

Let's take a look at a practical example:

Frontend Console Output:

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

Backend Console Output:

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

From this output, we see that while the frontend successfully passes the criteria with region as "Queensland" and category as "Plumbing", the backend receives NaN for the region. So, what's going wrong?

Problems in Code Structure

In the backend code, the parameters are accessed via:

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

However, the issue arises in the way these parameters are logged. Specifically, the following line in the backend code has a small but critical mistake:

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

Breaking Down the Error

Comma and Plus Sign Issue:

Solutions: Fixing the Code

To resolve the NaN error, you only need to modify the console logging line in the backend code as follows:

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

Steps to Implement the Solution

Locate the Logging Line:

Update the Code:
Change the line to use the + operator correctly for concatenation without the comma separating the arguments.

Test Your Changes:
After modifying the code, re-run your application and check the console logs to ensure the values are being logged correctly.

Conclusion