Guide on defining a data type for the response payload in a Next.js route controller

interface DefaultResponse<T> {
  success: boolean;
  message?: string;
  user?: T;
}

export async function POST(req: Request) {
  const body: Pick<User, 'email' | 'password'> = await req.json();

  const user = await prisma.user.findUnique({ where: { email: body.email } });

  if (!user) {
    return new Response(
      JSON.stringify({ message: 'email is invalid', success: false }),
    );
  }

  return new Response(
    JSON.stringify({ message: '', sueecss: true, user }),
  ) as DefaultResponse<User>; // This method will not work.
}



The mentioned script verifies the validity of an email address and provides member details upon a match.

I aim to define a type for the response body to detect any misspellings like in the above code. How can I set a type for the response body?

Answer №1

Attempting to convert the output of JSON.stringify(...), a string, into DefaultResponse will result in an error, but not for the intended reason.

To resolve this issue, it is recommended to define the return type of the handler function and utilize either Response.json() or NextResponse.json(). You can do so as shown below:


import { NextResponse } from "next/server"

interface DefaultResponse<T> {
  success: boolean;
  message?: string;
  user?: T;
}

export async function POST(req: Request): Promise<NextResponse<DefaultResponse<User>>> {
  const body: Pick<User, 'email' | 'password'> = await req.json();

  const user = await prisma.user.findUnique({ where: { email: body.email } });

  if (!user) {
    return NextResponse.json({ message: 'email is invalid', success: false });
  }

  return NextResponse.json({ message: '', success: true, user })
}

Furthermore, it may be beneficial to exclude the password field from the user object retrieved from Prisma before including it in the response. Refer to: https://www.prisma.io/docs/concepts/components/prisma-client/excluding-fields

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