Nextjs / Mongodb connection issue error shows when using instrumentation.js and middleware.ts

Question

I saw this article about connecting MongoDB when the project started.

After I implemented it. The project works without any issues.

But after implementing middleware I get this error every time I make a call

Below are the codes

instrumentation.ts

import { connectToMongoDB } from "@/lib/mongoose";

export async function register() {
await connectToMongoDB();
}

mongoose.ts

import mongoose, { Connection } from "mongoose";

let cachedConnection: Connection | null = null;

export async function connectToMongoDB() {
if (cachedConnection) {
console.log("Using cached db connection");
return cachedConnection;
}
try {
const cnx = await mongoose.connect(process.env.MONGODB_URI!);
cachedConnection = cnx.connection;
console.log("New mongodb connection established");
return cachedConnection;
} catch (error) {
console.log(error);
throw error;
}
}

middleware.ts

import { NextResponse } from "next/server";
import type { NextRequest } from "next/server";

// This function can be marked `async` if using `await` inside
export function middleware(request: NextRequest) {
console.log("test middleware");
return NextResponse.redirect(new URL("/home", request.url));
}

// See "Matching Paths" below to learn more
export const config = {
matcher: \["/api/onboarding/:path\*"\],
};

MAY I KNOW WHAT THE REAL ISSUE IS. HOW TO FIX THAT

tried to move both files to app, also removed await from instrumentations.ts

김희진 · Accepted Answer · 2024-10-11 02:37:19Z

1

import { connectToMongoDB } from "@/lib/mongoose";

export async function register() {
  if (process.env.NEXT_RUNTIME !== 'nodejs') return;
  await connectToMongoDB();
}

answered Oct 11, 2024 at 2:37

김희진

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