Vibe.D Receive JSON Field

app.d

import vibe.vibe;
import vibe.core.log;
import std.conv;


void main()
{
	listenHTTP("localhost:8080", &handleRequest);
	runApplication();
}

void handleRequest(HTTPServerRequest req, HTTPServerResponse res)
{
	if (req.path == "/")
	{
		auto json = req.json;
		logInfo(req.json.toString());
		float value = to!float(req.json["value"].get!string);
		string response = "calculation: ";
		value *= 3;
		res.writeBody(response ~ to!string(value));
	}
}