react-cookie

What is react-cookie?

The react-cookie package is a library for handling cookies in React applications. It provides hooks and components to easily set, get, and remove cookies, making it simple to manage user sessions and preferences.

What are react-cookie's main functionalities?

Setting a Cookie

This feature allows you to set a cookie using the `useCookies` hook. In this example, a cookie named 'user' is set with the value 'John Doe' when the login button is clicked.

import { useCookies } from 'react-cookie';

function App() {
  const [cookies, setCookie] = useCookies(['user']);

  const handleLogin = () => {
    setCookie('user', 'John Doe', { path: '/' });
  };

  return (
    <div>
      <button onClick={handleLogin}>Login</button>
    </div>
  );
}

Getting a Cookie

This feature allows you to get a cookie using the `useCookies` hook. In this example, the value of the 'user' cookie is displayed in a paragraph.

import { useCookies } from 'react-cookie';

function App() {
  const [cookies] = useCookies(['user']);

  return (
    <div>
      <p>User: {cookies.user}</p>
    </div>
  );
}

Removing a Cookie

This feature allows you to remove a cookie using the `useCookies` hook. In this example, the 'user' cookie is removed when the logout button is clicked.

import { useCookies } from 'react-cookie';

function App() {
  const [cookies, setCookie, removeCookie] = useCookies(['user']);

  const handleLogout = () => {
    removeCookie('user', { path: '/' });
  };

  return (
    <div>
      <button onClick={handleLogout}>Logout</button>
    </div>
  );
}

Other packages similar to react-cookie

js-cookie

js-cookie is a simple, lightweight JavaScript API for handling cookies. It is not specific to React but can be used in any JavaScript project. Compared to react-cookie, js-cookie requires more manual handling of cookies but offers more flexibility for non-React environments.

universal-cookie

universal-cookie is a library for handling cookies in both client and server environments. It provides a consistent API for managing cookies in JavaScript and is often used in conjunction with server-side rendering frameworks. Compared to react-cookie, universal-cookie is more versatile for isomorphic applications.

react-use-cookie

react-use-cookie is a React hook for managing cookies. It is similar to react-cookie but offers a simpler API with fewer features. It is suitable for projects that need basic cookie management without the additional functionality provided by react-cookie.

README

react-cookie

Universal cookies for React

Integrations

• universal-cookie - Universal cookies for JavaScript
• universal-cookie-express - Hook cookies get/set on Express for server-rendering

Minimum requirement

react-cookie @ v3.0+

• React.js >= 16.3.0 (new context API + forward ref)

react-cookie @ v0.0-v2.2

• React.js >= 15

Getting started

npm install react-cookie

or in the browser (global variable ReactCookie):

<script
  crossorigin
  src="https://unpkg.com/react@16/umd/react.production.js"
></script>
<script
  crossorigin
  src="https://unpkg.com/universal-cookie@6/umd/universalCookie.min.js"
></script>
<script
  crossorigin
  src="https://unpkg.com/react-cookie@6/umd/reactCookie.min.js"
></script>

<CookiesProvider defaultSetOptions />

Set the user cookies

On the server, the cookies props must be set using req.universalCookies or new Cookie(cookieHeader)

• defaultSetOptions: You can set default values for when setting cookies.

useCookies([dependencies])

Access and modify cookies using React hooks.

const [cookies, setCookie, removeCookie] = useCookies(['cookie-name']);

React hooks are available starting from React 16.8

dependencies (optional)

Let you optionally specify a list of cookie names your component depend on or that should trigger a re-render. If unspecified, it will render on every cookie change.

cookies

Javascript object with all your cookies. The key is the cookie name.

setCookie(name, value, [options])

Set a cookie value

• name (string): cookie name
• value (string|object): save the value and stringify the object if needed
• options (object): Support all the cookie options from RFC 6265
  • path (string): cookie path, use / as the path if you want your cookie to be accessible on all pages
  • expires (Date): absolute expiration date for the cookie
  • maxAge (number): relative max age of the cookie from when the client receives it in seconds
  • domain (string): domain for the cookie (sub.domain.com or .allsubdomains.com)
  • secure (boolean): Is only accessible through HTTPS?
  • httpOnly (boolean): Can only the server access the cookie? Note: You cannot get or set httpOnly cookies from the browser, only the server.
  • sameSite (boolean|none|lax|strict): Strict or Lax enforcement

removeCookie(name, [options])

Remove a cookie

• name (string): cookie name
• options (object): Support all the cookie options from RFC 6265
  • path (string): cookie path, use / as the path if you want your cookie to be accessible on all pages
  • expires (Date): absolute expiration date for the cookie
  • maxAge (number): relative max age of the cookie from when the client receives it in seconds
  • domain (string): domain for the cookie (sub.domain.com or .allsubdomains.com)
  • secure (boolean): Is only accessible through HTTPS?
  • httpOnly (boolean): Can only the server access the cookie? Note: You cannot get or set httpOnly cookies from the browser, only the server.
  • sameSite (boolean|none|lax|strict): Strict or Lax enforcement

updateCookies()

Read back the cookies from the browser and triggers the change listeners. This should normally not be necessary because this library detects cookie changes automatically.

withCookies(Component)

Give access to your cookies anywhere. Add the following props to your component:

• cookies: Cookies instance allowing you to get, set and remove cookies.
• allCookies: All your current cookies in an object.

Your original static properties will be hoisted on the returned component. You can also access the original component by using the WrappedComponent static property. Example:

function MyComponent() {
  return null;
}
const NewComponent = withCookies(MyComponent);
NewComponent.WrappedComponent === MyComponent;

Cookies

get(name, [options])

Get a cookie value

• name (string): cookie name
• options (object):
  • doNotParse (boolean): do not convert the cookie into an object no matter what

getAll([options])

Get all cookies

• options (object):
  • doNotParse (boolean): do not convert the cookie into an object no matter what

set(name, value, [options])

Set a cookie value

• name (string): cookie name
• value (string|object): save the value and stringify the object if needed
• options (object): Support all the cookie options from RFC 6265
  • path (string): cookie path, use / as the path if you want your cookie to be accessible on all pages
  • expires (Date): absolute expiration date for the cookie
  • maxAge (number): relative max age of the cookie from when the client receives it in seconds
  • domain (string): domain for the cookie (sub.domain.com or .allsubdomains.com)
  • secure (boolean): Is only accessible through HTTPS?
  • httpOnly (boolean): Can only the server access the cookie? Note: You cannot get or set httpOnly cookies from the browser, only the server.
  • sameSite (boolean|none|lax|strict): Strict or Lax enforcement

remove(name, [options])

Remove a cookie

• name (string): cookie name
• options (object): Support all the cookie options from RFC 6265
  • path (string): cookie path, use / as the path if you want your cookie to be accessible on all pages
  • expires (Date): absolute expiration date for the cookie
  • maxAge (number): relative max age of the cookie from when the client receives it in seconds
  • domain (string): domain for the cookie (sub.domain.com or .allsubdomains.com)
  • secure (boolean): Is only accessible through HTTPS?
  • httpOnly (boolean): Can only the server access the cookie? Note: You cannot get or set httpOnly cookies from the browser, only the server.
  • sameSite (boolean|none|lax|strict): Strict or Lax enforcement

Simple Example with React hooks

// Root.jsx
import React from 'react';
import App from './App';
import { CookiesProvider } from 'react-cookie';

export default function Root() {
  return (
    <CookiesProvider defaultSetOptions={{ path: '/' }}>
      <App />
    </CookiesProvider>
  );
}

// App.jsx
import React from 'react';
import { useCookies } from 'react-cookie';

import NameForm from './NameForm';

function App() {
  const [cookies, setCookie] = useCookies(['name']);

  function onChange(newName) {
    setCookie('name', newName);
  }

  return (
    <div>
      <NameForm name={cookies.name} onChange={onChange} />
      {cookies.name && <h1>Hello {cookies.name}!</h1>}
    </div>
  );
}

export default App;

Simple Example with Higher-Order Component

// Root.jsx
import React from 'react';
import App from './App';
import { CookiesProvider } from 'react-cookie';

export default function Root() {
  return (
    <CookiesProvider>
      <App />
    </CookiesProvider>
  );
}

// App.jsx
import React, { Component } from 'react';
import { instanceOf } from 'prop-types';
import { withCookies, Cookies } from 'react-cookie';

import NameForm from './NameForm';

class App extends Component {
  static propTypes = {
    cookies: instanceOf(Cookies).isRequired,
  };

  constructor(props) {
    super(props);

    const { cookies } = props;
    this.state = {
      name: cookies.get('name') || 'Ben',
    };
  }

  handleNameChange(name) {
    const { cookies } = this.props;

    cookies.set('name', name, { path: '/' });
    this.setState({ name });
  }

  render() {
    const { name } = this.state;

    return (
      <div>
        <NameForm name={name} onChange={this.handleNameChange.bind(this)} />
        {this.state.name && <h1>Hello {this.state.name}!</h1>}
      </div>
    );
  }
}

export default withCookies(App);

Server-Rendering Example

// src/components/App.js
import React from 'react';
import { useCookies } from 'react-cookie';

import NameForm from './NameForm';

function App() {
  const [cookies, setCookie] = useCookies(['name']);

  function onChange(newName) {
    setCookie('name', newName, { path: '/' });
  }

  return (
    <div>
      <NameForm name={cookies.name} onChange={onChange} />
      {cookies.name && <h1>Hello {cookies.name}!</h1>}
    </div>
  );
}

export default App;

// src/server.js
import React from 'react';
import ReactDOMServer from 'react-dom/server';
import { CookiesProvider } from 'react-cookie';

import Html from './components/Html';
import App from './components/App';

export default function middleware(req, res) {
  const markup = ReactDOMServer.renderToString(
    <CookiesProvider cookies={req.universalCookies}>
      <App />
    </CookiesProvider>,
  );

  const html = ReactDOMServer.renderToStaticMarkup(<Html markup={markup} />);

  res.send('<!DOCTYPE html>' + html);
}

// src/client.js
import React from 'react';
import ReactDOM from 'react-dom';
import { CookiesProvider } from 'react-cookie';

import App from './components/App';

const appEl = document.getElementById('main-app');

ReactDOM.render(
  <CookiesProvider>
    <App />
  </CookiesProvider>,
  appEl,
);

// server.js
require('@babel/register');

const express = require('express');
const serverMiddleware = require('./src/server').default;
const cookiesMiddleware = require('universal-cookie-express');

const app = express();

app
  .use('/assets', express.static('dist'))
  .use(cookiesMiddleware())
  .use(serverMiddleware);

app.listen(8080, function () {
  console.log('Listening on 8080...');
});