The topic
Your app works. You're about to send the link to real people. A good moment to ask whether it's safe, and an uncomfortable one, because the AI that wrote it will happily say yes whether or not it's true.
You can't prove an app is secure. You can catch the common, embarrassing mistakes, and that is where most real-world problems come from.
The short answer
Check eight things: where your secret keys are, whether login really protects each page, who can read which data, what happens with uploads and form input, how payments are handled, whether the libraries are up to date, whether errors reveal too much, and whether you can restore from a backup. If you can't answer one with confidence, treat that as the thing to fix first.
The longer answer
Ask the AI each question, then verify the answer yourself in the running app. Don't just accept its reassurance.
1. Where are my secret keys?
Passwords and API keys must live in a private settings area, never in the code, a chat, or a public repository. Search your project for anything that looks like a key. If one has ever been public, replace it.
2. Does login really protect everything?
Log out and try opening a private page by typing its address. Then log in as one user and try a page that belongs to another. Pages that "hide" behind a button are still open if the address works.
3. Who can read which data?
The biggest real-world failure is a database that lets any visitor, or any logged-in user, read everyone's records. Test with two accounts. User A should never see user B's data.
4. What happens to input and uploads?
Try odd input: very long text, symbols, an empty form, a file that isn't what it claims. Anything users can type or upload should be checked before it's stored or shown.
5. How are payments handled?
Use a payment provider's hosted checkout. Never store card numbers yourself. Confirm payment on the server side, not just in the browser.
6. Are the building blocks up to date?
Your app depends on many libraries. Ask the AI to list them and flag any with known problems, and set a reminder to repeat that every few months.
7. Do errors give away too much?
If something breaks, a visitor should see a polite message, not a stack of technical detail about your system.
8. Can I restore a backup?
Not "do I have one" but "have I restored from it". A backup you've never tested is a hope.
When to get a second pair of eyes
If you handle personal data, take payments or serve businesses, a human review is worth it. It need not be expensive. A fresh pair of eyes catches what you and the AI both missed.
Learn more on Qeetoto
For the wider picture read you can build it yourself, should you? and from vibe-coded to venture-ready. If you hold personal data, see GDPR for a one-person SaaS.
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