Skip to content

tRPC on Cloudflare with SST

Create and deploy a tRPC API in Cloudflare with SST.

We are going to build a tRPC API, a simple client, and deploy it to Cloudflare using SST.

Before you get started:

  1. Create your Cloudflare API token
  2. Install the SST CLI

1. Create a project

Let’s start by creating our app.

Terminal window
mkdir my-trpc-app && cd my-trpc-app
npm init -y

Init SST

Now let’s initialize SST in our app. Make sure you have the CLI installed.

Terminal window
sst init

This’ll create a sst.config.ts file in your project root.

Set the Cloudflare API token

You can save your Cloudflare API token in a .env file or just set it directly.

Terminal window
export CLOUDFLARE_API_TOKEN=aaaaaaaa_aaaaaaaaaaaa_aaaaaaaa

2. Add the API

Let’s add two Workers; one for our tRPC server and one that’ll be our client. Update your sst.config.ts.

async run() {
const trpc = new sst.cloudflare.Worker("Trpc", {
url: true,
handler: "index.ts",
const client = new sst.cloudflare.Worker("Client", {
url: true,
link: [trpc],
handler: "client.ts",
return {
api: trpc.url,
client: client.url,

We are linking the server to our client. This will allow us to access the server in our client.

3. Create the server

Let’s create our tRPC server. Add the following to index.ts.

const t = initTRPC.context().create();
const router = t.router({
greet: t.procedure
.input(z.object({ name: z.string() }))
.query(({ input }) => {
return `Hello ${}!`;
export type Router = typeof router;
export default {
async fetch(request: Request): Promise<Response> {
return fetchRequestHandler({
req: request,
endpoint: "/",
createContext: (opts) => opts,

We are creating a simple method called greet that takes a string as an input.

Add the relevant imports.

import { z } from "zod";
import { initTRPC } from "@trpc/server";
import { fetchRequestHandler } from "@trpc/server/adapters/fetch";

And install the npm packages.

Terminal window
npm install zod @trpc/server@next

4. Add the client

Now we’ll connect to our server in our client. Add the following to client.ts.

export default {
async fetch() {
const client = createTRPCClient<Router>({
links: [
url: "http://localhost/",
fetch(req) {
return Resource.Trpc.fetch(req);
return new Response(
await client.greet.query({
name: "Patrick Star",

Add the imports. Notice we are importing the types for our API.

import { Resource } from "sst";
import type { Router } from "./index";
import { createTRPCClient, httpBatchLink } from "@trpc/client";

Install the client npm package.

Terminal window
npm install @trpc/client@next

Start dev mode

Start your app in dev mode.

Terminal window
sst dev

This will give you two URLs.


Test your app

To test our app, hit the client URL.

Terminal window

This will print out Hello Patrick Star!.

5. Deploy your app

Now let’s deploy your app.

Terminal window
sst deploy