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Usage with React

info
  • If you're using Next.js, read the Usage with Next.js guide instead.
  • In order to infer types from your Node.js backend you should have the frontend & backend in the same monorepo.

Add tRPC to existing React project#

tRPC works fine with Create React App!

1. Install tRPC dependencies#

yarn add @trpc/client @trpc/server @trpc/react react-query zod
  • React Query: @trpc/react provides a thin wrapper over react-query. It is required as a peer dependency.
  • Zod: most examples use Zod for input validation, though it isn't required. You can use a validation library of your choice (Yup, io-ts, etc). In fact, any object containing a parse or validateSync method will work.

2. Implement your appRouter#

Follow the Quickstart and read the @trpc/server docs for guidance on this. Once you have your API implemented and listening via HTTP, continue to the next step.

3. Create tRPC hooks#

Create a set of strongly-typed React hooks from your AppRouter type signature with createReactQueryHooks.

// utils/trpc.ts
import { createReactQueryHooks } from '@trpc/react';
import type { AppRouter } from '../path/to/router.ts';
export const trpc = createReactQueryHooks<AppRouter>();
// => { useQuery: ..., useMutation: ...}

4. Add tRPC providers#

In your App.tsx

import React from 'react';
import { useState } from 'react';
import { QueryClient, QueryClientProvider } from 'react-query';
import { trpc } from './utils/trpc';
function App() {
const [queryClient] = useState(() => new QueryClient());
const [trpcClient] = useState(() =>
trpc.createClient({
url: 'http://localhost:5000/trpc',
// optional
headers() {
return {
authorization: getAuthCookie(),
};
},
}),
);
return (
<trpc.Provider client={trpcClient} queryClient={queryClient}>
<QueryClientProvider client={queryClient}>
{/* Your app here */}
</QueryClientProvider>
</trpc.Provider>
);
}

4. Fetch data#

import { trpc } from '../utils/trpc';
const IndexPage = () => {
const hello = trpc.useQuery(['hello', { text: 'client' }]);
if (!hello.data) return <div>Loading...</div>;
return (
<div>
<p>{hello.data.greeting}</p>
</div>
);
};
export default IndexPage;