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The Axios and React JS error code of 400 (Bad Request) occurs when the server is unable to process the request due to invalid or incomplete information being sent in the request. This error indicates that the client-side code has made a mistake in constructing the request.

To handle this error, you can display an error message to the user explaining the issue and asking them to fix the information and resubmit the request. You can also log the error on the server-side to identify the root cause of the issue and take any necessary steps to fix the problem.

To prevent this error from occurring in the first place, you can implement form validation on the client-side to ensure that all required fields are filled out correctly before submitting the request. On the server-side, you can implement input validation and sanitization to ensure that the data received is valid and safe to use.