Security check for Replit apps

Common issues to check before launch

• Keys hard-coded in source files instead of Replit Secrets
• A public /.env file or debug endpoints left reachable
• Missing HTTPS redirect or security headers on custom servers

Practical fixes

• Store keys in Replit Secrets (environment variables), never in code
• Make sure your server doesn't serve dotfiles
• Add security headers in your server framework (for example helmet for Express)

What StackSiren does

Paste your Replit app's public URL. StackSiren makes a few normal GET requests and checks for exposed keys, Supabase/Firebase config, security headers, HTTPS, exposed files and SEO basics. The full report includes fix prompts you can paste into Replit or any AI coding tool.

These are common patterns, not claims about every Replit app. Many apps have none of these issues.

Related guides

• Exposed API keys in AI-built apps: how to find and fix them
• Supabase Row Level Security (RLS): the check every AI-built app needs
• Missing security headers: CSP, HSTS, X-Frame-Options and more