Resolving the 404 Error in Postman When Posting Data to Your Node.js Server

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Understanding the Problem

Example Code Snippet

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The Solution

What to Check

Content-Type Header: Ensure that you are sending the request with the correct content type. If you are trying to send a JSON object, ensure your Postman request includes the header:

Content-Type: application/json

Data Formatting: If you intend to send form data (as x-www-form-urlencoded), indicate that in Postman by selecting "form-data" or "x-www-form-urlencoded" in the body settings.

Modifications to Your Code

To handle incoming POST requests correctly and resolve the 404 error, ensure you have the following lines added to your express setup:

Parse URL-Encoded Data: If you want to allow for URL-encoded data (which Postman may send), you must add middleware to parse it. This can be done by including this line:

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The { extended: true } option allows for rich objects and arrays to be encoded into the URL-encoded format which adds a lot of power to your applications.

Full Example

Here’s the updated initialization code for your Express server, with the required line included:

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Conclusion

Feel free to explore further modifications based on your specific use case, and happy coding! If you continue to have issues, do not hesitate to ask for help.