Lovable and Auth0 integration: Step-by-Step Guide 2025

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How to integrate Lovable with Auth0?

Setting Up Auth0 Dependency in Your Lovable Project

Since Lovable doesn’t use a terminal to install dependencies, we simulate installing Auth0 by including its code in our project. In your project’s main HTML file (typically index.html), add a script tag to include Auth0’s SPA SDK from a CDN. Insert the following snippet within the <head> section:


<script src="https://cdn.auth0.com/js/auth0-spa-js/1.22/auth0-spa-js.production.min.js"></script>

This code loads the Auth0 SPA SDK so you can use it directly within your TypeScript code.

Creating the Auth0 Client Configuration File

Create a new file in your Lovable project called auth0-client.ts. This file will contain the functions to initialize Auth0, trigger login, and handle redirects.
Paste the following code into auth0-client.ts:


import createAuth0Client, { Auth0Client } from '@auth0/auth0-spa-js';

let auth0Client: Auth0Client | null = null;
export async function initAuth0(): Promise<void> {
  auth0Client = await createAuth0Client({
    domain: "YOURAUTH0DOMAIN", // Replace with your Auth0 domain
    clientid: "YOURAUTH0CLIENTID", // Replace with your Auth0 client ID
    redirect_uri: window.location.origin
  });
}
export function login(): void {
  if (auth0Client) {
    auth0Client.loginWithRedirect();
  }
}
export async function handleRedirectCallback(): Promise<void> {
  if (auth0Client) {
    await auth0Client.handleRedirectCallback();
  }
}
export async function isAuthenticated(): Promise<boolean> {
  if (auth0Client) {
    return await auth0Client.isAuthenticated();
  }
  return false;
}
export async function getUser(): Promise<any> {
  if (auth0Client) {
    return await auth0Client.getUser();
  }
  return null;
}

Make sure to replace YOURAUTH0DOMAIN and YOURAUTH0CLIENT_ID with the actual values provided from your Auth0 dashboard.

Integrating Auth0 Into Your Main Application Code

Locate your main TypeScript file where the core logic of your Lovable project lives (commonly named main.ts or similar).
At the top of this file, import the functions from the auth0 client configuration you just created by adding the following:


import { initAuth0, login, handleRedirectCallback, isAuthenticated, getUser } from './auth0-client';

Next, initialize Auth0 when your application starts. Add the following code snippet early in your application logic (for instance, in an initialization function):


initAuth0().then(async () => {
  // Check if we are returning from an Auth0 redirect
  if (window.location.search.includes("code=") && window.location.search.includes("state=")) {
    await handleRedirectCallback();
    // Optionally, remove the query parameters from the URL after handling
    window.history.replaceState({}, document.title, window.location.pathname);
  }
  
  // Check if the user is authenticated
  const authenticated = await isAuthenticated();
  if (!authenticated) {
    // If not authenticated, trigger the login flow
    login();
  } else {
    // If authenticated, you can retrieve user information
    const user = await getUser();
    console.log("Logged in user:", user);
    // Your additional code for logged in users goes here
  }
});

This snippet will initialize Auth0 and automatically trigger login if the user isn’t authenticated. It also handles the login redirect callback and lists the current user details in the console.

Handling Post-Login Redirects and User Sessions

If your Lovable project has a navigation or view management system, incorporate the user session information. For example, after verifying that the user is authenticated (as seen above), you can update your UI to display user-specific content.
Ensure that any UI components that require protected data check whether the user is authenticated before rendering content. You can call the isAuthenticated and getUser functions as needed.

Simulating Dependency Installation Through Code

Since Lovable doesn’t support a terminal and traditional dependency installation, ensure that all necessary modules are available in your project. The Auth0 SPA SDK is loaded via the CDN script in your HTML file.
The import statement in auth0-client.ts assumes TypeScript is configured to handle modules. If your project does not support module resolution out-of-the-box, include a reference to the Auth0 SPA SDK types directly in your code or use bundled versions of your code as required by Lovable.

Final Verification

Save all files and refresh your Lovable project in the browser.
Watch for the login redirection; if you are not already authenticated with Auth0, the application should redirect you to the Auth0 login screen.
After successful login, the application will handle the redirect, remove query parameters, and display logged in user information in the console.

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