README.md

cookies-next

A versatile cookie management library for Next.js applications, supporting both client-side and server-side operations.

Features

• Works on client-side, server-side rendering, and API routes
• Supports Next.js 13+ App Router and Server Components
• TypeScript compatible
• Lightweight and easy to use

Installation

For Next.js versions 15 and above, use the latest version of cookies-next:

npm install --save cookies-next@latest

For Next.js versions 12.2.0 to 14.x, use cookies-next version 4.3.0:

npm install --save cookies-next@4.3.0

Usage

Importing

For Next.js 15+:

// For client-side usage
import { getCookie, getCookies, setCookie, deleteCookie, hasCookie } from 'cookies-next/client';

// For server-side usage
import { getCookie, getCookies, setCookie, deleteCookie, hasCookie } from 'cookies-next/server';

Also, you can leave the decision of which import to use to the the library itself, by importing from the root:

import { getCookie, getCookies, setCookie, deleteCookie, hasCookie } from 'cookies-next';

For Next.js 12.2.0 to 13.x:

import { getCookie, getCookies, setCookie, deleteCookie, hasCookie } from 'cookies-next';

Basic Operations

Set a cookie

setCookie('key', 'value', options);

Get a cookie

const value = getCookie('key', options);

Get all cookies

const cookies = getCookies(options);

Check if a cookie exists

const exists = hasCookie('key', options);

Delete a cookie

deleteCookie('key', options);

Client-side Usage

'use client';

import { getCookies, setCookie, deleteCookie, getCookie } from 'cookies-next/client';

function ClientComponent() {
  /* 
 ❗❗❗ In a client component, it's highly recommended to use cookies-next functions within useEffect or in event handlers; otherwise, you might encounter hydration mismatch errors. - 
 https://react.dev/link/hydration-mismatch.   
 */

  useEffect(() => {
    getCookies();
    getCookie('key');
    setCookie('key', 'value');
    deleteCookie('key');
    hasCookie('key');
  }, []);

  const handleClick = () => {
    getCookies();
    getCookie('key');
    setCookie('key', 'value');
    deleteCookie('key');
    hasCookie('key');
  };

  /* .... */
}
// Use anywhere in client-side code

Server-side Usage (App Router)

In Server Components:

import { getCookie, getCookies, hasCookie } from 'cookies-next/server';
import { cookies } from 'next/headers';

export const ServerComponent = async () => {
  // Read-only operations in Server Components
  const value = await getCookie('test', { cookies });
  const allCookies = await getCookies({ cookies });
  const exists = await hasCookie('test', { cookies });

  // Note: It's not possible to update cookies in Server Components
  ❌ setCookie("test", "value", { cookies }); // Won't work
  ❌ deleteCookie('test', { cookies }); // Won't work

  return <div>...</div>;
};

In Server Actions:

'use server';

import { cookies } from 'next/headers';
import { setCookie, deleteCookie, getCookie, getCookies, hasCookie } from 'cookies-next/server';

export async function serverAction() {
  await setCookie('test', 'value', { cookies });
  await deleteCookie('test', { cookies });
  await getCookie('test', { cookies });
  await getCookies({ cookies });
  await hasCookie('test', { cookies });
}

API Routes (App Router)

import { cookies } from 'next/headers';
import { NextRequest, NextResponse } from 'next/server';
import { deleteCookie, getCookie, setCookie, hasCookie, getCookies } from 'cookies-next/server';

export async function GET(req: NextRequest) {
  const res = new NextResponse();
  await setCookie('test', 'value', { res, req });
  await getCookie('test', { res, req });
  await getCookies({ res, req });
  await deleteCookie('test', { res, req });
  await hasCookie('test', { req, res });

  // Using cookies function
  await setCookie('test1', 'value', { cookies });
  await getCookie('test1', { cookies });
  await getCookies({ cookies });
  await deleteCookie('test1', { cookies });
  await hasCookie('test1', { cookies });

  return res;
}

Middleware

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { getCookie, setCookie, deleteCookie, hasCookie, getCookies } from 'cookies-next/server';

export async function middleware(req: NextRequest) {
  const res = NextResponse.next();
  await setCookie('test', 'value', { res, req });
  await hasCookie('test', { req, res });
  await deleteCookie('test', { res, req });
  await getCookie('test', { res, req });
  await getCookies({ res, req });

  // Note: cookies function from next/headers cannot be used in middleware
  ❌ setCookie('test', 'value', { cookies }); // Won't work

  return res;
}

API

setCookie(key, value, options)

Sets a cookie.

setCookie('key', 'value', options);

getCookie(key, options)

Retrieves a specific cookie.

const value = getCookie('key', options);

getCookies(options)

Retrieves all cookies.

const cookies = getCookies(options);

hasCookie(key, options)

Checks if a cookie exists.

const exists = hasCookie('key', options);

deleteCookie(key, options)

Deletes a cookie.

deleteCookie('key', options);

Options

• req: Required for server-side operations (except when using cookies function)
• res: Required for server-side operations (except when using cookies function)
• cookies: Function from next/headers, used in App Router for server-side operations
• domain: Specifies the cookie's domain
• path: Specifies the cookie's path
• maxAge: Specifies the cookie's maximum age in seconds
• httpOnly: Sets the HttpOnly flag
• secure: Sets the Secure flag
• sameSite: Sets the SameSite attribute ('strict', 'lax', or 'none')

For more detailed options, refer to the cookie specification.

License

MIT