Lovable + Auth0 Security Blueprint

To secure a Lovable + Auth0 stack, you need to: (1) configure callback and logout URLs for production, (2) restrict allowed web origins, (3) keep Client Secret server-side only, and (4) validate tokens on your backend. This blueprint covers Auth0 application settings and token verification best practices.

Setup Time1-2 hours

TL;DR

Auth0 provides enterprise-grade authentication but requires proper configuration. Key tasks: configure allowed callback URLs for production, restrict allowed origins, store Client Secret securely (server-side only), validate tokens on the backend, and never trust client-side auth checks alone.

Auth0 Application Configuration

Setting	Development	Production
Allowed Callback URLs	http://localhost:3000/callback	https://yourdomain.com/callback
Allowed Logout URLs	http://localhost:3000	https://yourdomain.com
Allowed Web Origins	http://localhost:3000	https://yourdomain.com

Part 1: Auth0 Environment Variables

Public (client-side)

VITE_AUTH0_DOMAIN=your-tenant.auth0.com
VITE_AUTH0_CLIENT_ID=your-client-id
VITE_AUTH0_AUDIENCE=https://your-api

Private (server-side only)

# Never expose this in client code
AUTH0_CLIENT_SECRET=your-client-secret

Critical: The Client Secret must never be in client-side code. If you need server-side operations, use Auth0's Management API from a backend service.

Part 2: Auth0 Token Validation

Verify tokens on backend

import jwt from 'jsonwebtoken';
import jwksClient from 'jwks-rsa';

const client = jwksClient({
  jwksUri: `https://${process.env.AUTH0_DOMAIN}/.well-known/jwks.json`
});

async function verifyToken(token: string) {
  const decoded = jwt.decode(token, { complete: true });
  const key = await client.getSigningKey(decoded.header.kid);

  return jwt.verify(token, key.getPublicKey(), {
    audience: process.env.AUTH0_AUDIENCE,
    issuer: `https://${process.env.AUTH0_DOMAIN}/`,
    algorithms: ['RS256']
  });
}

Security Checklist

Pre-Launch Checklist for Lovable + Auth0

Callback URLs restricted to production domain

Allowed origins configured correctly

Client Secret only on server-side

Tokens validated on backend APIs

Refresh token rotation enabled

Appropriate token lifetimes configured

MFA enabled for admin accounts

Is the Auth0 Client ID safe to expose?

Yes, the Client ID identifies your application but doesn't grant access. The Client Secret is what must be protected. For SPAs, use PKCE flow which doesn't require a secret.

Should I validate tokens on the client?

Client-side validation is for UX only. Always validate tokens on your backend before performing protected operations. The client can be manipulated.

Alternative Stack Options

Consider these related blueprints for different stack combinations:

Lovable + Supabase - Built-in auth with Supabase Auth
Lovable + Firebase - Firebase Authentication alternative
Lovable + Vercel - Deployment platform guide

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