The error message “Possible unhandled promise rejection (id: 0): [AxiosError: Request failed with status code 400]” indicates that there is an unhandled promise rejection in the code, specifically when making a request using Axios and receiving a 400 status code from the server.
When using Axios, HTTP status codes in the 400-499 range typically indicate client errors, such as sending invalid data or making incorrect requests. In this case, a 400 status code suggests that the request made by Axios was invalid or malformed in some way.
To resolve this error, you should carefully examine the code that makes the Axios request and ensure that all required data is provided correctly, and the request parameters are properly formatted. Here’s an example of how to handle such an error in your code:
axios.get('/api/some-endpoint')
.then(response => {
// Handle successful response
})
.catch(error => {
if (error.response && error.response.status === 400) {
console.error("Bad request:", error.response.data);
// Handle specific error for 400 status code
} else {
console.error("Error:", error.message);
// Handle other errors
}
});
In the example above, a GET request is made to the “/api/some-endpoint” endpoint. If the request receives a 400 status code, the error is caught in the catch block. You can then handle the specific error for the 400 status code, such as displaying an error message or taking appropriate action. For other errors, a generic error message is logged.