json_proc_macro 0.4.2

provides a proc macro for parsing JSON-like syntax
Documentation 
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use std::env;

fn main() {
    // Cargo sets the host and target env vars for build scripts, but not crates:
    // https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts
    // So we just re-export them to the crate code under a non-clashing name.
    export_var("PROFILE", &env::var("PROFILE").unwrap());
    // By default Cargo only runs the build script when a file changes.
    // This makes it re-run on target change
    println!(r#"cargo::rustc-check-cfg=cfg(profile, values("dev","release"))"#);
    println!(r#"cargo::rustc-cfg=profile="{}""#, env::var("PROFILE").unwrap());
}

/// this is stolen from some git repo
fn export_var(name: &str, value: &str) {
    println!("cargo:rustc-env={}={}", name, value);
}