serde_json error impl From<> in rust

mapping.rs

impl From<serde_json::Error> for Error {
    fn from(value: serde_json::Error) -> Self {
        let class = match value.classify() {
            serde_json::error::Category::Io => "io",
            serde_json::error::Category::Syntax => "syntax",
            serde_json::error::Category::Data => "data",
            serde_json::error::Category::Eof => "eof",
        };

        Error::Deser {
            class: class.to_string(),
        }
    }
}