Integrating trpc into your Next.js Project

Integrating `tRPC` into your Next.js project can streamline the process of building and managing APIs by offering a type-safe and easy-to-use solution. Here’s a detailed look at how to integrate `tRPC` and what benefits it brings:

### Benefits of Using `tRPC` in Your Next.js Project

1. Type Safety: `tRPC` provides end-to-end type safety, which means that you can leverage TypeScript’s type inference throughout your API calls. This ensures that your client-side code and server-side code remain in sync with regards to data types.

2. Simplified API Development: You avoid the boilerplate code associated with traditional REST APIs or GraphQL. `tRPC` allows you to define your API procedures directly in TypeScript, which makes it easier to develop and maintain.

3. Automatic Type Inference: `tRPC` automatically infers types from your backend procedures and provides them on the client side, reducing the need for manual type declarations and minimizing the risk of errors.

4. Enhanced Developer Experience: With built-in support for TypeScript, `tRPC` can enhance the developer experience by catching type errors early and providing autocomplete and inline documentation.

### Integrating `tRPC` into Your Next.js Project

#### 1. Install Dependencies

First, install `tRPC` and the necessary packages:

```bash

npm install @trpc/server @trpc/client @trpc/react

npm install zod

```

If you're using TypeScript (which is recommended), you'll also need:

```bash

npm install @types/node @types/react

```

#### 2. Set Up `tRPC` Server Procedures

Create a `trpc` folder in your project and define your API procedures. For example, you might have a `trpc/router.ts` file where you define your procedures:

```typescript

// trpc/router.ts

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

import { z } from 'zod';

export const appRouter = createRouter()

.query('getUser', {

input: z.string(),

resolve: async ({ input }) => {

// Replace with actual logic to get user data

return { id: input, username: 'ExampleUser' };

},

})

.mutation('updateUser', {

input: z.object({

id: z.string(),

username: z.string(),

}),

resolve: async ({ input }) => {

// Replace with actual logic to update user data

return { success: true };

},

});

export type AppRouter = typeof appRouter;

```

#### 3. Set Up `tRPC` in Your API Route

Create an API route to handle `tRPC` requests:

```typescript

// pages/api/trpc/[trpc].ts

import { createNextApiHandler } from '@trpc/server/adapters/next';

import { appRouter } from '../../../trpc/router';

export default createNextApiHandler({

router: appRouter,

createContext: () => ({}),

});

```

#### 4. Configure `tRPC` Client

Set up the `tRPC` client in your Next.js app:

```typescript

// trpc/client.ts

import { createTRPCReact } from '@trpc/react';

import type { AppRouter } from './router';

export const trpc = createTRPCReact<AppRouter>();

```

#### 5. Use `tRPC` in Your Components

Now you can use `tRPC` hooks in your React components:

```typescript

// components/Profile.tsx

import { trpc } from '../trpc/client';

import { useEffect } from 'react';

const Profile = () => {

const { data, isLoading, error } = trpc.useQuery(['getUser', 'user-id']);

if (isLoading) return <p>Loading...</p>;

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

return (

<div>

<h1>Username: {data?.username}</h1>

</div>

);

};

export default Profile;

```

#### 6. Setup in `_app.tsx`

Wrap your application with the `tRPC` provider:

```typescript

// pages/_app.tsx

import { AppType } from 'next/app';

import { trpc } from '../trpc/client';

const MyApp: AppType = ({ Component, pageProps }) => {

return (

<trpc.Provider

client={trpcClient}

queryClient={queryClient}

>

<Component {...pageProps} />

</trpc.Provider>

);

};

export default MyApp;

```

### Summary

- Type Safety: With `tRPC`, both the client and server share the same TypeScript types, reducing runtime errors due to type mismatches.

- Developer Experience: Simplifies the development process with automatic type inference and eliminates boilerplate code.

- Seamless Integration: Easily integrates with Next.js, allowing for a clean and efficient way to handle server-side logic.

Integrating `tRPC` into your Next.js project will streamline your API development process and provide a more robust and maintainable codebase.