Solving the undefined Value Issue in Node.js + Axios POST Requests

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Understanding the Problem

Client-Side Code (React)

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Reasons for Receiving undefined Values

Incorrect Content-Type: The first problem lies in the content type that’s being set during the POST request. You're using 'Content-Type': 'application/x-www-form-urlencoded', which is intended for form data. However, the JSON being sent suggests a different content type.

Solution Breakdown

1. Update the Content-Type

If you're sending JSON, it’s essential to inform your server appropriately by setting the content type to application/json. Here’s how you can modify your Axios request:

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2. No Need to Manually Set Content-Type

In cases where you're using axios and sending JSON, you don't necessarily need to specify the Content-Type, as Axios automatically sets it to JSON when sending requests containing objects.

3. Accessing Data Correctly on the Server

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Alternative: Sending Form Data

If you indeed need to submit form-encoded data, you can achieve that by using URLSearchParams. Here's how that code would look:

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Conclusion