Bolt.new Security Checklist Before You Launch

This Bolt.new security checklist is for founders who built something real with Bolt.new and want to launch without leaving the door open. Bolt.new is great at getting a full-stack app running quickly, and that's exactly why it deserves a security pass before you go live: Bolt.new generates real backend code, which means real backend risk. Where a purely front-end builder mostly exposes you to configuration mistakes, Bolt writes custom server logic, database queries, and API routes — more surface area, and more places for a security gap to hide. The checklist below is ordered by impact, so start at the top.

Why Bolt.new apps need a security pass specifically

Bolt.new produces working code by drawing on patterns from a large body of public code, most of which was written to show how a feature works, not to withstand an attacker. So the output nails the happy path and quietly skips the adversarial one. The result is a predictable set of gaps: secrets that ended up in the wrong place, database queries that trust user input, API routes with no authentication, and a total absence of security headers. Every item below follows from that one root cause.

1. Hunt down exposed secrets first

Because Bolt.new writes backend code and often wires up third-party services, hardcoded secrets are the highest-priority risk. Search your source and your deployed bundle for API keys and confirm none are hardcoded in a file or committed to a public repository. A leaked Stripe secret key means someone can create charges or read your customer list; a leaked Supabase service-role key means full, unauthenticated access to your database. Anything secret belongs in a server-only environment variable, never in one prefixed with NEXT_PUBLIC_. If a key has ever been in a public repo, rotate it. Our guide on finding exposed API keys shows the exact checks.

2. Check every database query for injection

Bolt.new generates more custom database code than most AI builders, which makes SQL injection a real risk. Look at how your queries are built: if user input is concatenated directly into a query string (for example a template literal containing request data), that endpoint can likely be manipulated by an attacker. Use parameterized queries or the Supabase query builder, which is safe by default. And enable Row Level Security so the database enforces access even when a query is imperfect — see what is RLS and why every Supabase app needs it.

3. Protect your API routes

Every backend route that returns user data or performs an action needs to verify the user's session on the server. Bolt-built apps commonly rely on the UI to hide a feature while leaving the underlying route reachable by anyone who knows the URL. Add an explicit auth check to each sensitive handler, and verify that the requested record belongs to the requesting user — the missing ownership check (an IDOR) is one of the most common serious flaws in AI-generated CRUD apps.

4. Enable Supabase Row Level Security

If your Bolt.new app uses Supabase, confirm Row Level Security is enabled on every table. New Supabase tables default to RLS off, which means your public anon key — visible in the browser — can read and write everything. Turn RLS on and add owner-scoped policies. This is the database-layer safety net that protects you even if an API route or query has a bug.

5. Add HTTP security headers

Bolt.new does not configure a Content Security Policy, HSTS, or X-Frame-Options by default. These headers prevent clickjacking, reduce the blast radius of any cross-site scripting bug, and enforce HTTPS. They're a quick win that noticeably improves your security posture — the exact configuration is in our Next.js security headers guide.

6. Add rate limiting on authentication

Any login, signup, or password-reset endpoint needs rate limiting. Credential-stuffing attacks are fully automated and will test large lists of stolen credentials against an unprotected login form. IP-based rate limiting makes that attack uneconomical. If you want to see what such an attack actually looks like, read what a real credential stuffing attack looks like.

Run the checklist in about a minute

You can go through each item above by hand, or you can paste your live Bolt.new URL into a scanner and have most of them checked automatically. Sayver's free website security scan looks for exposed keys, missing headers, Supabase exposure signals, and more, and returns a security score with each finding explained in plain English and a fix you can paste back into Bolt.new. Run it before you launch, and again after each significant change, so you always know your Bolt app is actually safe — not just working.