Node js Web api doesn't send an error if the price is lower than 0

 If your Node.js web API is not sending an error response when the price is lower than 0, it's likely because there's an issue in your API's validation or error-handling logic. You should check and debug the relevant parts of your code to address this problem. Here are some steps to help you identify and fix the issue:


1. **Validation Logic**:

   Review the validation logic in your API code. Ensure that you are properly checking the price value and responding with an error if it's less than 0. For example, you might have a check like:


   ```javascript

   if (price < 0) {

     return res.status(400).json({ error: "Price cannot be negative" });

   }

   ```


   Make sure this check is correctly placed in your API endpoint.


2. **Middleware**:

   Check if you have any middleware in your API that might affect the request and response. Ensure that middleware doesn't modify the price value or prevent the error response from being sent.


3. **Error Handling**:

   Review your error-handling middleware or code. Make sure that you have a proper error-handling mechanism in place that captures any errors and sends appropriate responses.


4. **Logging**:

   Implement logging in your API to track the execution flow. Log the price value and any errors to help diagnose the issue.


5. **Testing**:

   Test your API with different inputs, including negative prices, to ensure that the validation and error handling are working as expected.


6. **Route and Controller Code**:

   Examine the route and controller code for the specific endpoint where you're encountering this issue. Ensure that the validation logic is implemented there.


7. **Third-Party Dependencies**:

   If you're using any third-party libraries or middleware, check their documentation and configurations to ensure they are not interfering with error handling.


8. **Error Response Structure**:

   Double-check the structure of your error response. Ensure it conforms to a consistent format, including a status code and a message. This consistency makes it easier to handle and parse errors on the client side.


9. **Status Codes**:

   Use appropriate HTTP status codes for your error responses. For validation issues like this, a 400 Bad Request status code is often suitable.


10. **Unit Testing**:

    Write unit tests for your API endpoints, including test cases that cover negative prices, and verify that the API correctly sends error responses.


If you continue to face issues after checking these aspects, it would be helpful to provide more specific details about your API code and how the pricing validation is implemented so that I can provide more targeted assistance.

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