Not much to it really

import std_;
void main() {
	auto x = JSONValue_([`fdsa` : 10, `ytrewq` : 22]);
	writeln_(toJSON_(&x).retro_().asUpperCase_());
	GC_.collect(); // D-runtime symbols are exposed too
};

If you get deprecation messages, try compiling with -de. Note: it's not well tested. There could be problems with modules that publicly import other internal modules.