Macro ray_json 

macro_rules! ray_json {
    () => { ... };
    ($($value:expr),+ $(,)?) => { ... };
}

Log values as JSON using Serialize. ray_json!() returns a handle, and ray_json!(value, ...) logs and returns the handle for chaining. ray!(json: value, ...) is an alias if you prefer to stay on ray!.

use ray::ray_json;
use serde::Serialize;

#[derive(Serialize)]
struct Event {
    name: String,
}

ray_json!(Event {
    name: "started".to_string(),
});