Log Scrubber Redacting Secret Values
A structured log scrubber that masks known secret keys and bearer tokens before serialization, without mutating the original object.
Security Boundaries Examples
Treat every input as untrusted: contain paths, isolate secrets, and avoid shell injection.
Run Commands With Argument Arrays Not Shell Strings
A command runner that executes binaries with an argument array and no shell, so untrusted values can never be interpreted as shell syntax.
Safe Path Join Blocking Traversal
A path resolver that joins untrusted segments onto a base directory and rejects any attempt to escape it via dot dot segments or absolute paths.
Validate Untrusted Input At A Single Boundary
A boundary parser that validates raw external input once and hands typed, sanitized values to the rest of the program.
CSS Focus Visible Accessibility
Style accessible focus indicators using CSS focus-visible to show outlines only for keyboard navigation not mouse.
Sealed Class Hierarchy Design
Demonstrates sealed classes and interfaces to create restricted class hierarchies, enabling exhaustive pattern matching and domain modeling with known subtypes.