supabase/apps/docs/content/guides/auth/quickstarts/react.mdx

---
title: 'Use Supabase Auth with React'
subtitle: 'Learn how to use Supabase Auth with React.js.'
breadcrumb: 'Auth Quickstarts'
hideToc: true
---

<StepHikeCompact>

  <StepHikeCompact.Step step={1}>
    <StepHikeCompact.Details title="Create a new Supabase project">

    [Launch a new project](/dashboard) in the Supabase Dashboard.

    Your new database has a table for storing your users. You can see that this table is currently empty by running some SQL in the [SQL Editor](/dashboard/project/_/sql).

    </StepHikeCompact.Details>

    <StepHikeCompact.Code>

     ```sql name=SQL_EDITOR
      select * from auth.users;
      ````

    </StepHikeCompact.Code>

  </StepHikeCompact.Step>

  <StepHikeCompact.Step step={2}>

    <StepHikeCompact.Details title="Create a React app">

    Create a React app using a [Vite](https://vitejs.dev/guide/) template.

    </StepHikeCompact.Details>

    <StepHikeCompact.Code>

    ```bash name=Terminal
    npm create vite@latest my-app -- --template react
    ```

    </StepHikeCompact.Code>

  </StepHikeCompact.Step>

  <StepHikeCompact.Step step={3}>
    <StepHikeCompact.Details title="Install the Supabase client library">

    Navigate to the React app and install the Supabase libraries.

    </StepHikeCompact.Details>

    <StepHikeCompact.Code>

      ```bash name=Terminal
      cd my-app && npm install @supabase/supabase-js
      ```

    </StepHikeCompact.Code>

  </StepHikeCompact.Step>
  <StepHikeCompact.Step step={4}>
    <StepHikeCompact.Details title="Declare Supabase Environment Variables">

    Create `.env.local` and populate with your project's URL and Key.

    <$Partial path="api_settings_steps.mdx" />

    </StepHikeCompact.Details>

    <StepHikeCompact.Code>

      ```text name=.env.local
      VITE_SUPABASE_URL=your-project-url
      VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY=sb_publishable_... or anon key
      ```

    </StepHikeCompact.Code>

  </StepHikeCompact.Step>
  <StepHikeCompact.Step step={5}>
    <StepHikeCompact.Details title="Set up your login component">

    <$Partial path="uiLibCta.mdx" />

    In `App.jsx`, create a Supabase client using your Project URL and key.

    You can configure the Auth component to display whenever there is no session inside `supabase.auth.getSession()`

    </StepHikeCompact.Details>
    <StepHikeCompact.Code>

      ```jsx name=src/App.jsx
      import "./index.css";
      import { useState, useEffect } from "react";
      import { createClient } from "@supabase/supabase-js";

      const supabase = createClient(import.meta.env.VITE_SUPABASE_URL, import.meta.env.VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY);

      export default function App() {
          const [loading, setLoading] = useState(false);
          const [email, setEmail] = useState("");
          const [session, setSession] = useState(null);

          // Check URL params on initial render
          const params = new URLSearchParams(window.location.search);
          const hasTokenHash = params.get("token_hash");

          const [verifying, setVerifying] = useState(!!hasTokenHash);
          const [authError, setAuthError] = useState(null);
          const [authSuccess, setAuthSuccess] = useState(false);

          useEffect(() => {
              // Check if we have token_hash in URL (magic link callback)
              const params = new URLSearchParams(window.location.search);
              const token_hash = params.get("token_hash");
              const type = params.get("type");

              if (token_hash) {
                  // Verify the OTP token
                  supabase.auth.verifyOtp({
                      token_hash,
                      type: type || "email",
                  }).then(({ error }) => {
                      if (error) {
                          setAuthError(error.message);
                      } else {
                          setAuthSuccess(true);
                          // Clear URL params
                          window.history.replaceState({}, document.title, "/");
                      }
                      setVerifying(false);
                  });
              }

              // Check for existing session
              supabase.auth.getSession().then(({ data: { session } }) => {
                  setSession(session);
              });

              // Listen for auth changes
              const {
                  data: { subscription },
              } = supabase.auth.onAuthStateChange((_event, session) => {
                  setSession(session);
              });

              return () => subscription.unsubscribe();
          }, []);

          const handleLogin = async (event) => {
              event.preventDefault();
              setLoading(true);
              const { error } = await supabase.auth.signInWithOtp({
                  email,
                  options: {
                      emailRedirectTo: window.location.origin,
                  }
              });
              if (error) {
                  alert(error.error_description || error.message);
              } else {
                  alert("Check your email for the login link!");
              }
              setLoading(false);
          };

          const handleLogout = async () => {
              await supabase.auth.signOut();
              setSession(null);
          };

          // Show verification state
          if (verifying) {
              return (
                  <div>
                      <h1>Authentication</h1>
                      <p>Confirming your magic link...</p>
                      <p>Loading...</p>
                  </div>
              );
          }

          // Show auth error
          if (authError) {
              return (
                  <div>
                      <h1>Authentication</h1>
                      <p>✗ Authentication failed</p>
                      <p>{authError}</p>
                      <button
                          onClick={() => {
                              setAuthError(null);
                              window.history.replaceState({}, document.title, "/");
                          }}
                      >
                          Return to login
                      </button>
                  </div>
              );
          }

          // Show auth success (briefly before session loads)
          if (authSuccess && !session) {
              return (
                  <div>
                      <h1>Authentication</h1>
                      <p>✓ Authentication successful!</p>
                      <p>Loading your account...</p>
                  </div>
              );
          }

          // If user is logged in, show welcome screen
          if (session) {
              return (
                  <div>
                      <h1>Welcome!</h1>
                      <p>You are logged in as: {session.user.email}</p>
                      <button onClick={handleLogout}>
                          Sign Out
                      </button>
                  </div>
              );
          }

          // Show login form
          return (
              <div>
                  <h1>Supabase + React</h1>
                  <p>Sign in via magic link with your email below</p>
                  <form onSubmit={handleLogin}>
                      <input
                          type="email"
                          placeholder="Your email"
                          value={email}
                          required={true}
                          onChange={(e) => setEmail(e.target.value)}
                      />
                      <button disabled={loading}>
                          {loading ? <span>Loading</span> : <span>Send magic link</span>}
                      </button>
                  </form>
              </div>
          );
      }
      ```

    </StepHikeCompact.Code>

  </StepHikeCompact.Step>

  <StepHikeCompact.Step step={6}>
    <StepHikeCompact.Details title="Customize email template">

    Before proceeding, change the email template to support support a server-side authentication flow that sends a token hash:

    - Go to the [Auth templates](/dashboard/project/_/auth/templates) page in your dashboard.
    - Select the Confirm sign up template.
    - Change `{{ .ConfirmationURL }}` to `{{ .SiteURL }}?token_hash={{ .TokenHash }}&type=email`.
    - Change your [Site URL](/dashboard/project/_/auth/url-configuration) to `https://localhost:5173`

    </StepHikeCompact.Details>

    </StepHikeCompact.Step>

  <StepHikeCompact.Step step={7}>
    <StepHikeCompact.Details title="Start the app">

      Start the app, go to http://localhost:5173 in a browser, and open the browser console and you should be able to register and log in.

      </StepHikeCompact.Details>

      <StepHikeCompact.Code>

        ```bash name=Terminal
        npm run dev
        ```

      </StepHikeCompact.Code>

    </StepHikeCompact.Step>

</StepHikeCompact>