Client-side or SSR, security-sensitive items need to be handled on the backend; however, there needs to be input validation on both frontend (for good UX) and backend (for data integrity/security).
Also, SSR doesn't necessarily mean that renders are only handled by page load. It's very common for SSR to perform initial render and then hand off to the client for hydrating without additional page loads.
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Client-side or SSR, security-sensitive items need to be handled on the backend; however, there needs to be input validation on both frontend (for good UX) and backend (for data integrity/security).
Also, SSR doesn't necessarily mean that renders are only handled by page load. It's very common for SSR to perform initial render and then hand off to the client for hydrating without additional page loads.