In rocket default the error catcher will return html response, I want to modify this and return json response instead:

#[catch(422)]
pub fn unprocessable_entity(req: &Request) -> Json<String> {
    let message = "".to_string();
    Json(message)
}

here is the struct to deserialized using the rocket serde:

#[derive(Deserialize, Debug)]
pub struct Product {
    pub name: Option<String>,
}

when I send incorrect JSON request type ex (name as number):

{
"name": 1
}

I could get data guard deserialization error on the running terminal rocket logs like this:

…Error(“invalid type: integer 2, expected a string”, line: 5,
column: 19)).

How can i return the data guard error from the logs to the catcher and return it as JSON? from the rocket doc i read the catcher method only accept 0 or 1 argument which is theRequest type