Next.js Build: An error was encountered while prerendering the page "/api/user"

Whenever I compile my Next.js 14 application using the app directory, I encounter the following error:

[Error]: Dynamic server usage: Page couldn't be rendered statically because it used `headers`. More details can be found here: https://nextjs.org/docs/messages/dynamic-server-error
    at l (/Users/joh/Documents/dev/waletoo/.next/server/chunks/185.js:30:30275)
    at u (/Users/joh/Documents/dev/waletoo/.next/server/chunks/185.js:30:26794)
    at s (/Users/joh/Documents/dev/waletoo/.next/server/chunks/185.js:30:20357)
    at p (/Users/joh/Documents/dev/waletoo/.next/server/app/api/user/route.js:1:1271)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async /Users/joh/Documents/dev/waletoo/node_modules/next/dist/compiled/next-server/app-route.runtime.prod.js:6:41304 {
  digest: 'DYNAMIC_SERVER_USAGE'
}

An error occurred while prerendering page "/api/user". Find more information here: https://nextjs.org/docs/messages/prerender-error
Error: Internal Server Error
    at p (/Users/joh/Documents/dev/waletoo/.next/server/app/api/user/route.js:1:1442)

This is how I have defined my api/user/route route :

import { getServerSession } from "next-auth";
import connectDB from "@/src/mongoDB/connect";
import UserModel from "@/src/mongoDB/userSchema";
import { authOptions } from "@/src/utils/authOptions";

export async function GET() {
    await connectDB();

    try {
        const session = await getServerSession(authOptions);

        if (!session?.user?.email) throw new Error("Unauthorized");

        const userEmail = session.user.email;
        const userInformations = await UserModel.find({ email: userEmail });

        return new Response(JSON.stringify(userInformations));
    } catch (error) {
        console.error(error);
        throw new Error("Internal Server Error");
    }
}

Can you identify any issues in this setup?

javascriptnext.js

Answer №1

The issue you are encountering is directly related to the usage of getServerSession in a statically generated page. Next.js typically handles server rendering in a single location, so any data fetching tied to a user must be recognized as dynamic.

To fix this problem, simply include export const dynamic = "force-dynamic" at the top of your page. This informs Next.js that the page utilizes dynamic server functionalities and cannot be statically optimized. Below is how you can update your code:

Javascript:

   export const dynamic = "force-dynamic";

import { getServerSession } from "next-auth";
import connectDB from "@/src/mongoDB/connect";
import UserModel from "@/src/mongoDB/userSchema";
import { authOptions } from "@/src/utils/authOptions";

export async function GET() {
    await connectDB();

    try {
        const session = await getServerSession(authOptions);

        if (!session?.user?.email) throw new Error("Unauthorized");

        const userEmail = session.user.email;
        const userInformations = await UserModel.find({ email: userEmail });

        return new Response(JSON.stringify(userInformations));
    } catch (error) {
        console.error(error);
        throw new Error("Internal Server Error");
    }
}

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