deser-json5

JSON5 support for deser. JSON5 extends JSON with comments, trailing commas, identifiers as map keys, single quoted strings, hexadecimal numbers, Infinity, NaN and more.

#[derive(deser::Deserialize)]
struct Config<'a> {
    name: &'a str,
    ports: Vec<u16>,
    timeout: f64,
}

let config: Config = deser_json5::from_str(r#"{
    // the name of the service
    name: 'api',
    ports: [0x50, 443,],
    timeout: .5,
}"#).unwrap();
assert_eq!(config.name, "api");
assert_eq!(config.ports, [80, 443]);

Otherwise it works like deser-json, which is also used to serialize (JSON is valid JSON5). The parser is generated from the one of deser-json (see deser-template-json in the repository).