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Any file named route.ts in the /apps/web/app/api is an API Route. Here’s an example of an API Route that perform a Hello World: 
export async function GET() {
  return NextResponse.json({
    message: 'Hello World'
  })
}

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Protected API Route

To create a protected api route, you need to decorate the example above with the withSession helper: 
export const GET = withSession(async ({ session }) => {
  return NextResponse.json({
    message: `Hello World from ${session.user.name}`
  })
})

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Project-based Protected API Route

To create an api route that refers to a given project and not the authenticated user, use the withAuth helper: 
export const GET = withAuth(async ({ project, req, session }) => {
  return NextResponse.json({
    message: `
      Hello World from ${session.user.name}, 
      member of ${project.name} project
    `
  }) 
})

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Role Protection

withAuth accepts a second optional argument with the following structure: 
{
  requiredRole: ['owner']
}
We can add it to an api route to make it available only to the owner of the project: 
export const GET = withAuth(async ({ project, req, session }) => {
  return NextResponse.json({
    message: `
      Hello World from ${session.user.name}, 
      member of ${project.name} project
    `
  }) 
}, { requiredRole: ['owner'] })