Folder Structure

prisma

The prisma folder contains the schema.prisma file which is used to configure the database connection and the database schema. It is also the location to store migration files and/or seed scripts, if used. See Prisma usage for more information.

public

The public folder contains static assets that are served by the web server. The favicon.ico file is an example of a static asset.

src/env

Used for environment variable validation and type definitions - see Environment Variables.

src/pages

The pages folder contains all the pages of the Next.js application. The index.tsx file at the root directory of /pages is the homepage of the application. The _app.tsx file is used to wrap the application with providers. See Next.js documentation↗ for more information.

src/pages/api

The api folder contains all the API routes of the Next.js application. The examples.ts file contains an example of a route that uses the Next.js API route↗ feature along with Prisma. The restricted.ts file contains an example of a route that uses the Next.js API route↗ feature and is protected by NextAuth.js↗.

src/pages/api/auth/[...nextauth].ts

The [...nextauth].ts file is the NextAuth.js authentication slug route. It is used to handle authentication requests. See NextAuth.js usage for more information on NextAuth.js, and Next.js Dynamic Routes Docs↗ for info on catch-all/slug routes.

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

The [trpc].ts file is the tRPC API entrypoint. It is used to handle tRPC requests. See tRPC usage for more information on this file, and Next.js Dynamic Routes Docs↗ for info on catch-all/slug routes.

src/server

The server folder is used to clearly separate server-side code from client-side code.

src/server/auth.ts

The main entrypoint for server-side authentication logic. Here, we setup the NextAuth.js configuration options, perform module augmentation as well as provide some DX utlities for authentication such as retriving the user’s session on the server-side. See NextAuth.js usage for more information.

src/server/db.ts

The db.ts file is used to instantiate the Prisma client at global scope. See Prisma usage and best practices for using Prisma with Next.js↗ for more information.

src/server/api

The api folder contains the tRPC server-side code.

src/server/api/routers

The routers folder contains all your tRPC sub-routers.

src/server/api/routers/example.ts

The example.ts file is an example tRPC router utilizing the publicProcedure helper to demonstrate how to create a public tRPC route.

Depending on your chosen packages this router contains more or less routes to best demonstrate the usage to your needs.

src/server/api/trpc.ts

The trpc.ts file is the main configuration file for your tRPC back-end. In here we:

1. Define context used in tRPC requests. See tRPC usage for more information.
2. Export procedure helpers. See tRPC usage for more information.

src/server/api/root.ts

The root.ts file is used to merge tRPC routers and export them as a single router, as well as the router’s type definition. See tRPC usage for more information.

src/styles

The styles folder contains the global styles of the application.

src/utils

The utils folder is used to store commonly re-used utility functions.

src/utils/api.ts

The api.ts file is the front-end entrypoint to tRPC. See tRPC usage for more information.

.env

The .env file is used to store environment variables. See Environment Variables for more information. This file should not be committed to git history.

.env.example

The .env.example file shows example environment variables based on the chosen libraries. This file should be committed to git history.

.eslintrc.json

The .eslintrc.json file is used to configure ESLint. See ESLint Docs↗ for more information.

next-env.d.ts

The next-env.d.ts file ensures Next.js types are picked up by the TypeScript compiler. You should not remove it or edit it as it can change at any time. See Next.js Docs↗ for more information.

next.config.mjs

The next.config.mjs file is used to configure Next.js. See Next.js Docs↗ for more information. Note: The .mjs extension is used to allow for ESM imports.

postcss.config.cjs

The postcss.config.cjs file is used for Tailwind PostCSS usage. See Tailwind PostCSS Docs↗ for more information.

prettier.config.cjs

The prettier.config.cjs file is used to configure Prettier to include the prettier-plugin-tailwindcss for formatting Tailwind CSS classes. See the Tailwind CSS blog post↗ for more information.

tsconfig.json

The tsconfig.json file is used to configure TypeScript. Some non-defaults, such as strict mode, have been enabled to ensure the best usage of TypeScript for Create T3 App and its libraries. See TypeScript Docs↗ or TypeScript Usage for more information.