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JavaScript Quickstart

You will learn how to:

    • Add the ClerkJS SDK to your JavaScript application
    • Use Clerk components to allow users to sign in or out
Example repository

The next major version of the Clerk Javascript SDK is coming soon! If you're just starting a project, consider trying out the Core 2 beta(opens in a new tab) instead.

To add the ClerkJS SDK to your JavaScript application, you have two options:

  1. Install the package using a package manager, like npm, yarn, or pnpm.
  2. Use the <script> tag to load the ClerkJS package from our CDN.

Select your preferred method below to get started.

Set up a JavaScript application using Vite

To install the ClerkJS SDK, you will need to use a bundler like Vite(opens in a new tab) or Webpack(opens in a new tab) to use this method.

For the sake of this guide, scaffold your new JavaScript application using Vite(opens in a new tab). From the prompts, choose the Vanilla framework, and then choose the JavaScript variant.

npm create vite@latest clerk-javascript cd clerk-javascript npm install npm run dev
yarn create vite clerk-javascript cd clerk-javascript yarn install yarn dev
pnpm create vite clerk-javascript cd clerk-javascript pnpm install pnpm dev

Install @clerk/clerk-js

At the root of your project, install the ClerkJS package using your package manager of choice:

npm install @clerk/clerk-js
yarn add @clerk/clerk-js
pnpm add @clerk/clerk-js

Set environment variables

It's recommended to use environment variables to store your Clerk Publishable Key. A common way to use environment variables in a JavaScript project is by putting the values in an .env file and then loading them into your application using a package like dotenv(opens in a new tab). However, when using Vite, environment variables stored in an .env file at the project root are automatically exposed through the import.meta.env object(opens in a new tab).

  1. Create an .env file at the root of your project, and add your Clerk Publishable Key. If you're signed into Clerk, the .env snippet below will contain your key. Otherwise, you can copy it from the Clerk Dashboard by navigating to the API Keys(opens in a new tab) page.
  1. In your main.js file, import the publishable key using Vite's import.meta.env object.
const clerkPubKey = import.meta.env.VITE_CLERK_PUBLISHABLE_KEY;

Initialize ClerkJS

To initialize the ClerkJS SDK, import the Clerk class and instantiate it with your Publishable Key. Then, call the load() method to initialize ClerkJS.

import Clerk from "@clerk/clerk-js"; const clerkPubKey = import.meta.env.VITE_CLERK_PUBLISHABLE_KEY; const clerk = new Clerk(clerkPubKey); await clerk.load({ // Set load options here });

Calling the load() method initializes ClerkJS. For more information on the load() method and what options you can pass to it, check out the reference documentation.

Allow users to sign in and out

Clerk's prebuilt components are the easiest way to add authentication and user management to your application. They come styled out of the box and are customizable to fit your application's design.

To get started, you will use:

  • <SignIn />: renders a user interface for signing in.
  • <UserButton />: shows the avatar from the account the user is signed in with. When clicked, it opens a dropdown menu with options to sign out.

Your main.js file should look something like this:

import Clerk from "@clerk/clerk-js"; const clerkPubKey = import.meta.env.VITE_CLERK_PUBLISHABLE_KEY; const clerk = new Clerk(clerkPubKey); await clerk.load(); if (clerk.user) { document.getElementById("app").innerHTML = ` <div id="user-button"></div> `; const userButtonDiv = document.getElementById("user-button"); clerk.mountUserButton(userButtonDiv); } else { document.getElementById("app").innerHTML = ` <div id="sign-in"></div> `; const signInDiv = document.getElementById("sign-in"); clerk.mountSignIn(signInDiv); }

And your index.html file should look something like this:

<!doctype html> <html lang="en"> <head> <meta charset="UTF-8" /> <link rel="icon" type="image/svg+xml" href="/vite.svg" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Vite App</title> </head> <body> <div id="app"></div> <script type="module" src="/main.js"></script> </body> </html>

More resouces

Clerk Class Reference

Learn more about the Clerk class and how to use it.

Learn More

Authentication Components

Learn more about all our authentication components.

Learn More

Customization & Localization

Learn how to customize and localize the Clerk components.

Learn More

Last updated on March 26, 2024

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