Encountering an issue in my Next.js application with the app router where I am unable to read properties of undefined, specifically in relation to '

As I develop a basic Rest API in Next.js, my goal is to display "Hello world" in the console for a post api.

export const POST = (req: Request) => {
  console.log('hello world');
};

The error message that appears in my terminal is as follows:

TypeError: Cannot read properties of undefined (reading 'headers')
    at eval (webpack-internal:///(rsc)/./node_modules/next/dist/server/future/route-modules/app-route/module.js:265:61)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

I'm uncertain about where this error stems from and would appreciate some guidance.

In searching for solutions on platforms like Stack Overflow, one suggestion was to correct the JSON format when using NextResponse.json(). Here's an example of how it was initially set up:

import { NextResponse } from 'next/server';

export const errorResponse = async (error: any) => {
  return NextResponse.json({
    success: false,
    data: null,
    name: error.name || 'Unknown Error',
    message: error.message || 'An unknown error occured',
  });
};

To better understand the issue, I made sure to log each step during the development of this Rest API. Through this process, I identified a mistake in the initial setup.

Answer №1

To properly handle the response in your POST method, make sure to return a valid NextResponse instance instead of returning undefined. This is important because undefined does not possess the necessary properties such as headers:

export async function POST(request: Request) {
  return NextResponse.json("Greetings from the digital realm")
}

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