Phase 16 · Security Across the Stack
TopicsInput Validation
Part of the Full Stack Developer Roadmap.
Summary
Validating user input at every layer it passes through — client-side for UX, server-side as the actual security boundary — since a full-stack app has multiple places data enters the system.
How to Learn This
- 1Add validation to a form on the frontend and re-validate the same data on the backend.
- 2Confirm the backend rejects invalid data even if you bypass the frontend entirely, e.g. via Postman.
- 3Never trust that 'the frontend already checked this.'
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