SaaS Security Checklist Before Launch
Before launching your SaaS, verify authentication, data encryption, input validation, rate limiting, and access controls. This checklist covers the essential security measures every builder should have in place.
Why this matters
A security breach in the first weeks after launch can kill your product before it gets traction. Users trust you with their data from day one — that trust is earned by being prepared.
What's at stake
Stop worrying about whether you forgot something critical. One overlooked vulnerability can lead to data leaks, user churn, and reputational damage that takes months to recover from.
Your checklist.
Authentication is properly implemented
CriticalVerify that login, signup, password reset, and session management work correctly. Use established providers like Supabase Auth or Auth0 rather than rolling your own.
All API endpoints require authorization
CriticalEvery API route that accesses user data must verify the user has permission. Check for both authentication (who are you) and authorization (what can you do).
User input is validated and sanitized
CriticalAll user-facing inputs should be validated on the server side. Protect against SQL injection, XSS, and other injection attacks.
Data is encrypted in transit (HTTPS)
ImportantEnsure your app is served over HTTPS. Most hosting platforms like Vercel and Netlify handle this automatically.
Rate limiting is configured
ImportantAdd rate limits to authentication endpoints and API routes to prevent brute force attacks and abuse.
Error messages do not leak sensitive info
RecommendedGeneric error messages for login failures (don't reveal if an email exists). Stack traces should never be shown in production.
Dependency vulnerabilities are checked
RecommendedRun npm audit or similar tools to check for known vulnerabilities in your dependencies. Update or patch critical issues.
Prove your app is secure — before and after launch
- Automated security readiness checks before you go live
- Public security badge showing your app meets baseline standards
- Ongoing monitoring to catch regressions as you ship updates
Keep learning.
Related guides
Related topics
Frequently asked questions.
Even an MVP needs the basics: authentication, authorization on API routes, HTTPS, and input validation. Skip the advanced stuff like SOC 2 compliance for now, but never skip the fundamentals.
Yes, but review security-critical code carefully. AI tools sometimes generate insecure patterns like exposing API keys or missing authorization checks. Use this checklist to verify the output.