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Im trying to fetch and essentially cache the data using cookies, but I'm getting an error when creating the cookies. I'm not sure if I'm allowed to fetch and store data in the layout file itself. Can someone help me better understand

student/Layout.tsx

import type { Metadata } from "next";
import "../globals.css";
import Sidebar from "@/app/components/templates/sidebar";
import {
  Home,
  Calendar,
  BookOpenText,
  LibraryBig,
  ClipboardList,
  Waypoints,
} from "lucide-react";

import { Montserrat } from "next/font/google";
import { fetchServerSession } from "../backend/lib/hooks/getServerSession";
import { fetchStudentData } from "../backend/lib/onLoad/student/fetchStudentData";
import fetchEvents from "../backend/lib/onLoad/all/fetchEvents";
import { createCookie } from "../backend/lib/cookies/create";
import { redirect } from "next/navigation";

async function fetchAndCacheData() {
  "use server";
  const session = await fetchServerSession();

  if (!session?.user) {
    redirect("/");
  }

  const schoolId = session?.user?.school_id;
  const student_id = session?.user?.id;

  // Use Promise.all to fetch both promises concurrently
  const [studentData, events] = await Promise.all([
    fetchStudentData(schoolId?.toString() ?? "", student_id?.toString() ?? ""),
    fetchEvents(schoolId?.toString() ?? ""),
  ]);

  await Promise.all([
    createCookie("studentData", studentData),
    createCookie("events", events),
  ]);
}

await fetchAndCacheData();

const montserrat = Montserrat({ subsets: ["latin"] });

export const metadata: Metadata = {
  title: "Create Next App",
  description: "Generated by create next app",
};

export default async function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode;
}>) {
  const navigationItems = [
    {
      name: "Dashboard",
      href: "/student/dashboard",
      icon: <Home />,
      current: true,
    },

    {
      name: "Calendar",
      href: "/student/calendar",
      icon: <Calendar />,
      current: false,
    },
    {
      name: "Classes",
      href: `/student/classes`,
      icon: <BookOpenText />,
      current: false,
    },
    {
      name: "Study Material",
      href: "/student/studyMaterial",
      icon: <LibraryBig />,
      current: false,
    },
    {
      name: "Tests & Assingments",
      href: "/student/tests+assignments",
      icon: <ClipboardList />,
      current: false,
    },
    {
      name: "Learning Paths",
      href: "/student/learningPaths",
      icon: <Waypoints />,
      current: true,
    },
  ];

  return (
    <html lang="en h-full bg-gray-100">
      <body className={`${montserrat.className} antialiased bg-lightBg`}>
        <Sidebar navigation={navigationItems} />
        <main className="py-10 lg:pl-72">
          <div className="px-4 sm:px-6 lg:px-8">{children}</div>
        </main>
      </body>
    </html>
  );
}

lib/cookies/create.ts

"use server";
import { cookies } from "next/headers";
import { Encrypt } from "../encryption/encrypt";

export async function createCookie(name: string, data: any) {
  try {
    // Encrypt data
    const encryptedData = await Encrypt(data);

    // Set session cookie
    cookies().set({
      name: name,
      value: encryptedData,
      httpOnly: true,
      sameSite: "strict",
      secure: process.env.NODE_ENV === "production",
      path: "/",
    });

    return true;
  } catch (err) {
    console.error(`Error creating cookie: ${name}`, err);
    return false;
  }
}

Error creating cookie: studentData tA [Error]: Cookies can only be modified in a Server Action or Route Handler.

Im trying to fetch and essentially cache the data using cookies, but I'm getting an error when creating the cookies. I'm not sure if I'm allowed to fetch and store data in the layout file itself. Can someone help me better understand

student/Layout.tsx

import type { Metadata } from "next";
import "../globals.css";
import Sidebar from "@/app/components/templates/sidebar";
import {
  Home,
  Calendar,
  BookOpenText,
  LibraryBig,
  ClipboardList,
  Waypoints,
} from "lucide-react";

import { Montserrat } from "next/font/google";
import { fetchServerSession } from "../backend/lib/hooks/getServerSession";
import { fetchStudentData } from "../backend/lib/onLoad/student/fetchStudentData";
import fetchEvents from "../backend/lib/onLoad/all/fetchEvents";
import { createCookie } from "../backend/lib/cookies/create";
import { redirect } from "next/navigation";

async function fetchAndCacheData() {
  "use server";
  const session = await fetchServerSession();

  if (!session?.user) {
    redirect("/");
  }

  const schoolId = session?.user?.school_id;
  const student_id = session?.user?.id;

  // Use Promise.all to fetch both promises concurrently
  const [studentData, events] = await Promise.all([
    fetchStudentData(schoolId?.toString() ?? "", student_id?.toString() ?? ""),
    fetchEvents(schoolId?.toString() ?? ""),
  ]);

  await Promise.all([
    createCookie("studentData", studentData),
    createCookie("events", events),
  ]);
}

await fetchAndCacheData();

const montserrat = Montserrat({ subsets: ["latin"] });

export const metadata: Metadata = {
  title: "Create Next App",
  description: "Generated by create next app",
};

export default async function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode;
}>) {
  const navigationItems = [
    {
      name: "Dashboard",
      href: "/student/dashboard",
      icon: <Home />,
      current: true,
    },

    {
      name: "Calendar",
      href: "/student/calendar",
      icon: <Calendar />,
      current: false,
    },
    {
      name: "Classes",
      href: `/student/classes`,
      icon: <BookOpenText />,
      current: false,
    },
    {
      name: "Study Material",
      href: "/student/studyMaterial",
      icon: <LibraryBig />,
      current: false,
    },
    {
      name: "Tests & Assingments",
      href: "/student/tests+assignments",
      icon: <ClipboardList />,
      current: false,
    },
    {
      name: "Learning Paths",
      href: "/student/learningPaths",
      icon: <Waypoints />,
      current: true,
    },
  ];

  return (
    <html lang="en h-full bg-gray-100">
      <body className={`${montserrat.className} antialiased bg-lightBg`}>
        <Sidebar navigation={navigationItems} />
        <main className="py-10 lg:pl-72">
          <div className="px-4 sm:px-6 lg:px-8">{children}</div>
        </main>
      </body>
    </html>
  );
}

lib/cookies/create.ts

"use server";
import { cookies } from "next/headers";
import { Encrypt } from "../encryption/encrypt";

export async function createCookie(name: string, data: any) {
  try {
    // Encrypt data
    const encryptedData = await Encrypt(data);

    // Set session cookie
    cookies().set({
      name: name,
      value: encryptedData,
      httpOnly: true,
      sameSite: "strict",
      secure: process.env.NODE_ENV === "production",
      path: "/",
    });

    return true;
  } catch (err) {
    console.error(`Error creating cookie: ${name}`, err);
    return false;
  }
}

Error creating cookie: studentData tA [Error]: Cookies can only be modified in a Server Action or Route Handler.

  • next.js
  • cookies
  • storage
  • nextjs14
Share Improve this question asked Nov 20, 2024 at 0:24 Guilherme AbreuGuilherme Abreu 32 bronze badges
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1 Answer 1

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The error occurs because you are trying to modify cookies directly in the layout component, which is not allowed. Cookie modification need to happen within a Server Action of Route Handler. Move the logic into a dedicated server action.

student/action.ts

import { fetchStudentData } from "../backend/lib/onLoad/student/fetchStudentData";
import fetchEvents from "../backend/lib/onLoad/all/fetchEvents";
import { createCookie } from "../backend/lib/cookies/create";

export async function initializeData(schoolId?: string, studentId?: string) {
  if (!schoolId || !studentId) {
    throw new Error("Missing required parameters");
  }

  try {
    // Use Promise.all to fetch both promises concurrently
    const [studentData, events] = await Promise.all([
      fetchStudentData(schoolId.toString(), studentId.toString()),
      fetchEvents(schoolId.toString()),
    ]);

    // Set cookies using Promise.all
    await Promise.all([
      createCookie("studentData", studentData),
      createCookie("events", events),
    ]);

    return { success: true };
  } catch (error) {
    console.error("Error initializing data:", error);
    return { success: false, error };
  }
}

Then call the server action from the layout component after session verification

student/Layout.tsx

import type { Metadata } from "next";
import "../globals.css";
import Sidebar from "@/app/components/templates/sidebar";
import {
  Home,
  Calendar,
  BookOpenText,
  LibraryBig,
  ClipboardList,
  Waypoints,
} from "lucide-react";
import { Montserrat } from "next/font/google";
import { fetchServerSession } from "../backend/lib/hooks/getServerSession";
import { redirect } from "next/navigation";
import { initializeData } from "./actions";

const montserrat = Montserrat({ subsets: ["latin"] });

export const metadata: Metadata = {
  title: "Create Next App",
  description: "Generated by create next app",
};

export default async function RootLayout({
  children,
}: Readonly<{
  children: React.ReactNode;
}>) {
  const session = await fetchServerSession();

  if (!session?.user) {
    redirect("/");
  }

  // Initialize data using the server action
  await initializeData(session.user.school_id, session.user.id);

  const navigationItems = [
    {
      name: "Dashboard",
      href: "/student/dashboard",
      icon: <Home />,
      current: true,
    },
    {
      name: "Calendar",
      href: "/student/calendar",
      icon: <Calendar />,
      current: false,
    },
    {
      name: "Classes",
      href: `/student/classes`,
      icon: <BookOpenText />,
      current: false,
    },
    {
      name: "Study Material",
      href: "/student/studyMaterial",
      icon: <LibraryBig />,
      current: false,
    },
    {
      name: "Tests & Assignments",
      href: "/student/tests+assignments",
      icon: <ClipboardList />,
      current: false,
    },
    {
      name: "Learning Paths",
      href: "/student/learningPaths",
      icon: <Waypoints />,
      current: true,
    },
  ];

  return (
    <html lang="en" className="h-full bg-gray-100">
      <body className={`${montserrat.className} antialiased bg-lightBg`}>
        <Sidebar navigation={navigationItems} />
        <main className="py-10 lg:pl-72">
          <div className="px-4 sm:px-6 lg:px-8">{children}</div>
        </main>
      </body>
    </html>
  );
}

Let me know if you get any issues

本文标签： nextjsNext JS 14 Setting Cookie In LayoutStack Overflow

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