> ## Documentation Index
> Fetch the complete documentation index at: https://eo.utopy.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Minimal router

> A small router with one Effect procedure.

This example is the smallest useful `effect-orpc` router.

```ts title="router.ts" theme={null}
import { Context, Effect, Layer } from "effect";
import { eos } from "effect-orpc";
import * as z from "zod";

class Greeter extends Context.Service<
  Greeter,
  { readonly greet: (name: string) => Effect.Effect<string> }
>()("Greeter") {}

const GreeterLive = Layer.succeed(Greeter, {
  greet: (name) => Effect.succeed(`Hello, ${name}!`),
});

const procedure = eos.provide(GreeterLive);

export const router = {
  greet: procedure
    .input(z.object({ name: z.string() }))
    .output(z.string())
    .effect(function* ({ input }) {
      const greeter = yield* Greeter;
      return yield* greeter.greet(input.name);
    }),
};

const greet = router.greet.callable();
console.log(await greet({ name: "Ada" }));
```

## What to copy

Copy this shape when you need:

* one base Effect layer
* one reusable procedure builder
* direct invocation

## Next step

Add auth with [Auth and current user](/effect-v4/examples/auth-current-user).