Custom Data Transformers

When you need to serialize Date, Map, or BigInt fields, consider SuperJSON. Install superjson and register it in both server and client:

import superjson from 'superjson';

const t = initTRPC.create({
	transformer: superjson,
});

And on the client:

createTRPCClient<AppRouter>({
	transformer: superjson,
	links: [
		/* ... */
	],
});

Now your date objects will remain actual Date objects on the client, not random strings.