I've created my back end DB using express and MongoDB as an separate server folder and the next app in another client folder.
This is my app/api/auth/[...nextauth]/route.js

import NextAuth from "next-auth/next"; import CredentialsProvider from "next-auth/providers/credentials"; export const authOptions = { providers: [ CredentialsProvider({ name: "Credentials", credentials: { username: { label: "Username", type: "text", placeholder: "Username" }, password: { label: "Password", type: "text", placeholder: "Password" }, }, async authorize(credentials, req) { if (credentials.username == "admin" && credentials.password == "123") return { id: 1, name: "Santhosh", email: "santhosh@mail.com" }; return null; }, }), ], };

const handler = NextAuth(authOptions);
export { handler as GET, handler as POST };

it is working fine for now. But I need to authenticate the user cred here with the data in mongoose.
The mongoose document is created in the name of "Users" model.

import mongoose from "mongoose"; const UserSchema = new mongoose.Schema( { username: { type: String, required: true }, password: { type: String, required: true } }, { timestamps: true } ); export const User = mongoose.models.User || mongoose.model("User", UserSchema);
How to approach it since the model is not created within the Next app outside instead ?