TypedRoutes.swift

extension Route {
	init<IN: Codable, OUT: Codable>(uri: String, _ handler: @escaping (IN) throws -> OUT) {
		self.init(method: .post, uri: uri) {
			req, resp in
			do {
				guard let body = req.postBodyBytes else {
					throw DecodingError.dataCorrupted(.init(codingPath: [], debugDescription: "This request requires JSON input."))
				}
				let input = try JSONDecoder().decode(IN.self, from: Data(bytes: body))
				resp.setBody(bytes: try JSONEncoder().encode(try handler(input)).map{$0})
					.setHeader(.contentType, value: MimeType(type: .application, subType: "json").longType)
					.completed(status: .ok)
			} catch {
				resp.setBody(string: "\(error.localizedDescription)")
					.completed(status: .internalServerError)
			}
		}
	}
	
	init<OUT: Codable>(uri: String, _ handler: @escaping () throws -> OUT) {
		self.init(method: .get, uri: uri) {
			req, resp in
			do {
				resp.setBody(bytes: try JSONEncoder().encode(try handler()).map{$0})
					.setHeader(.contentType, value: MimeType(type: .application, subType: "json").longType)
					.completed(status: .ok)
			} catch {
				resp.setBody(string: "\(error.localizedDescription)")
					.completed(status: .internalServerError)
			}
		}
	}
}

// usage

struct HealthCheckResponse: Codable {
	let status: String
}

let healthCheck = Route(uri: "/healthcheck") {
	() -> HealthCheckResponse in
	return HealthCheckResponse(status: "OK")
}

// add healthCheck to your Routes