Why am I unable to utilize res of type NextResponse in my API endpoint?

I currently have a dynamic API route file specifically designed for handling POST requests. Below is the code snippet of this file:

import { NextRequest, NextResponse } from "next/server";
import dbConnect from "@/lib/dbConnect";
import User from "@/models/User";

export async function POST(req: NextRequest, res: NextResponse) {
    const data = await req.json();
    const { name, email, password, country } = data;
    await dbConnect();

    try {
        const user = await User.create({
            name, email, password, country
        })
        return NextResponse.json({
            success: true,
            data: user,
        }, {
            status: 201,
        })
    } catch (error) {
        return NextResponse.json({
            success: false,
        }, {
            status: 400,
        })
    }
}

Upon attempting to substitute NextResponse with res within the route, an error occurs. Here's the relevant section:

return res.json({
            success: true,
            data: user,
        }, {
            status: 201,
        })

The error message reads as follows:

Expected 0 arguments, but got 2.ts(2554)
.

https://i.sstatic.net/z3bru.png

What could be the reason behind such errors when attempting to replace NextResponse with res?

Answer №1

In case you find the need to utilize res for your specific scenario, you can implement the following:

export async function POST(req: NextRequest, res: NextApiResponse) {
    ...

    try {
        return res.status(201).json({
            success: true,
            data: user,
        })
    } catch (error) {
        return res.status(400).json({ success: false })
    }
}

It's important to remember that the variable res must be of type NextApiResponse, and not NextResponse.

Answer №2

It seems that you are utilizing the new app router (directory) if you have the export async function POST. In this case, an API route receives only the request as a parameter.

To send a response, you need to either return a Response or utilize NextResponse from next/server, for instance:

import { NextResponse } from "next/server";

export async function GET(request: Request) {

  return NextResponse.json({ message: "Hello World" });
  
  // OR

  return Response("Some plain text data")
}

The res is of type NextApiResponse and works alongside req of type NextApiRequest, but they apply to API routes within the initial pages router (directory).

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