How to Fix request.body Undefined Error in Express.js when Fetching a Number

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Understanding the Issue

Scenario Overview

Here’s a glimpse of how the situation looks in code:

Server-side code using Express:

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

Client-side code using fetch:

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

The above code snippets show a typical scenario where the data sent from the client does not match the structure that the server expects. Now let’s look at how we can resolve this.

Solutions

Solution 1: Directly Handle the Value

Update your server-side code like this:

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

Solution 2: Send an Object with Value Property

If you prefer to keep a structured approach, consider sending an object that contains a property named value. This requires a slight modification on the client-side.

Here’s how you can modify the sendAsync function:

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

Conclusion

With these simple adjustments, you can ensure your POST requests work as intended, leading to a more robust and error-free application.

Keep experimenting, and happy coding!