How to Secure API Keys in Lovable-Generated Apps

If you shipped a SaaS app with Lovable, the fastest way to leak your business is to leave your API keys in the frontend. This guide walks through what AI builders leave open, why it happens. How to fix it before it becomes a problem you can't walk back.

Start with the free scan at launchreadycode.com/#top before you do anything else. It tells you what is leaked right now, from your live URL, no code access needed.

What the Scan Data Shows

We have scanned 47 vibe-coded apps across Lovable, Bolt.new, Cursor, Replit, and v0.dev. The average Launch Readiness Score is 42/100. API key and auth token leak appeared in the majority of audits as a P1 or P0 finding.

31 of those 47 apps also had Supabase Row Level Security disabled. In those cases, a leaked anon key doesn't just expose the API. It leaks the whole database. Any user can query all rows directly.

Why AI Builders Leave Keys in the Frontend

Lovable optimizes for speed. The model completes your prompt correctly: the Stripe call runs, the OpenAI request works, the email sends. What it doesn't do is route that call through a server boundary first.

The AI wasn't wrong. It shipped what you asked for. It put the key where the browser can reach it. That's the easy path. The gap between "working code" and "safe code" is where vibe coding gets founders in trouble.

AI-generated code optimizes for "it works." It doesn't optimize for "it's safe to put in front of strangers."

The Five Fixes (Priority Order)

These aren't abstract tips. They're the exact changes that close the most common findings in our audit data:

1. Move API keys server-side. No secret should ever reach the browser. Use platform secrets management or env vars on the server. Lovable connects to Supabase natively. Any privileged call belongs in an edge function, not in your React component.
2. Use edge functions or a backend proxy. Supabase edge functions let you make external API calls where the key stays server-side. The browser sends a request to your edge function; the edge function calls the third party. The key never touches the client.
3. Turn on Row Level Security. RLS is your last line of defense if a key or token does slip. Without it, one leaked anon key can expose your whole table. Enabling RLS is three lines of SQL. Not enabling it's the default.
4. Rotate keys on a schedule. Make it a habit, not a fire drill. Short keys mean less damage if one leaks.
5. Scope keys to the minimum. A read-only key can't drain your account. A scoped OpenAI key can't be used to generate content at your cost. Grant the least privilege the feature needs.

How to Audit Your Live App Right Now

You don't need code access to find this. Open your browser. Go to DevTools and check the network tab as the app loads. Find main.js or similar bundle files. Look for API keys: long strings or ones starting with sk- or pk_live_.

If you see them there, so can anyone else who visits your app.

Alternatively: run the free scan. It does this check auto across your live URL, flags leaked keys. Gives you a ranked fix list — without touching your codebase. The scan completes in under two minutes.

What Comes After the Free Scan

The free scan gives you your score and flags the top findings. Want a full ranked fix plan? The Launch Readiness Audit ($499) gives you that. Your score is checked against 200+ apps we've scanned.

Want the fixes done for you? The DFY Technical Setup starts at $1,999. It includes a full code review, auth hardening, RLS setup, and secrets cleanup. All changes come as pull requests you approve.

Frequently Asked Questions