@trpc/next

What is @trpc/next?

@trpc/next is a package that allows you to create end-to-end typesafe APIs using tRPC in a Next.js application. It simplifies the process of building and consuming APIs by leveraging TypeScript for type safety and Next.js for server-side rendering and API routes.

What are @trpc/next's main functionalities?

Creating a tRPC Router

This feature allows you to create a tRPC router with various procedures. In this example, a simple 'hello' query is defined that returns 'Hello world'.

import { initTRPC } from '@trpc/server';

const t = initTRPC.create();

const appRouter = t.router({
  hello: t.procedure.query(() => 'Hello world'),
});

export type AppRouter = typeof appRouter;

Integrating tRPC with Next.js API Routes

This feature demonstrates how to integrate a tRPC router with Next.js API routes. The `createNextApiHandler` function is used to create an API handler that can be used in a Next.js API route.

import { createNextApiHandler } from '@trpc/server/adapters/next';
import { appRouter } from 'path/to/your/router';

export default createNextApiHandler({
  router: appRouter,
  createContext: () => null,
});

Using tRPC in Next.js Pages

This feature shows how to use tRPC in a Next.js page. The `trpc.hello.useQuery` hook is used to fetch data from the 'hello' query defined in the tRPC router.

import { trpc } from 'path/to/trpc';

const HomePage = () => {
  const { data, error, isLoading } = trpc.hello.useQuery();

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;

  return <div>{data}</div>;
};

export default HomePage;

Other packages similar to @trpc/next

next-api-decorators

next-api-decorators is a package that provides a set of decorators to create type-safe API routes in Next.js. It uses TypeScript decorators to define API routes and handlers, offering a similar level of type safety as @trpc/next but with a different approach.

blitz

Blitz is a full-stack React framework built on top of Next.js. It includes a built-in data layer that provides a type-safe API similar to tRPC. Blitz aims to be a 'batteries-included' framework, offering more out-of-the-box features compared to @trpc/next.

graphql

GraphQL is a query language for APIs and a runtime for executing those queries. While it is not specific to Next.js, it can be integrated with Next.js to create type-safe APIs. GraphQL offers more flexibility in querying data compared to tRPC but requires more setup and boilerplate.

README

tRPC

End-to-end typesafe APIs made easy

@trpc/next

Connect a tRPC router to Next.js.

Documentation

Full documentation for @trpc/next can be found here

Installation

# npm
npm install @trpc/next @trpc/react-query @tanstack/react-query@4

# Yarn
yarn add @trpc/next @trpc/react-query @tanstack/react-query@4

# pnpm
pnpm add @trpc/next @trpc/react-query @tanstack/react-query@4

# Bun
bun add @trpc/next @trpc/react-query @tanstack/react-query@4

Basic Example

Setup tRPC in utils/trpc.ts.

import { createTRPCNext, httpBatchLink } from '@trpc/next';
// Import the router type from your server file
import type { AppRouter } from '../pages/api/[trpc].ts';

export const trpc = createTRPCNext<AppRouter>({
  config() {
    return {
      links: [
        httpBatchLink({
          url: 'http://localhost:3000/trpc',
        }),
      ],
    };
  },
  ssr: true,
});

Hook up tRPC inside _app.tsx.

import { trpc } from '~/utils/trpc';

const App = ({ Component, pageProps }) => {
  return <Component {...pageProps} />;
};

export default trpc.withTRPC(App);

Now you can query your API in any component.

import { trpc } from '~/utils/trpc';

export function Hello() {
  const { data, error, status } = trpc.greeting.useQuery({
    name: 'tRPC',
  });

  if (error) {
    return <p>{error.message}</p>;
  }

  if (status !== 'success') {
    return <p>Loading...</p>;
  }

  return <div>{data && <p>{data.greeting}</p>}</div>;
}