Sending Cookie to API Route in Next.js 13:In a Next.js 13 project, you can send a cookie to an API route by including it in the headers of your Axios request in your server-side function. In the API route, you can access this cookie using request.cookies.get('cookieName').

api.post.list.route.ts

import { NextRequest, NextResponse } from "next/server";
import { AxiosInstance } from "axios";
import { CookieKeys } from "@/_enums";
import createAuthenticatedApiServiceV2 from "@/_services/createAuthenticatedApiServiceV2";
import handleAxiosError from "@/_utilities/handleAxiosError";

export async function GET(request: NextRequest) {

    try {
        const jwt: string | undefined = request.cookies.get(CookieKeys.Jwt)?.value;

        if (!jwt) {
            return NextResponse.json({ message: "You are not authorized to access this resource." }, { status: 403 });
        }
        // remain code....

    } catch (error) {
        console.log(error)
        const {
            message,
            status
        } = handleAxiosError(error, "Oops! Something went wrong while listing posts. Please refresh the page and try again!");
        return NextResponse.json({ message }, { status });
    }
}

fetchPosts.ts

import axios from "axios";
import handleAxiosError from "@/_utilities/handleAxiosError";
import { cookies } from "next/headers";
import { CookieKeys } from "@/_enums";

export default async function getPosts() {
    try {
        const jwt = cookies().get(CookieKeys.Jwt)?.value
        const url = `${process.env.NEXT_PUBLIC_API_BASE_URL}api/post/list`;
        const { data } = await axios.get(url, {
            params: {
                isCustom: true
            },
            headers: {
                'Cookie': `jwt=${jwt};`
            },
        });
        return {
            data,
            status: true
        };
    } catch (error) {
        const defaultMessage = "Oops! Something went wrong while loading posts. Please try again later.";
        const { message: data } = handleAxiosError(error, defaultMessage);
        return {
            data,
            status: false
        }
    }
}