Articles
Deep dives on .NET, React, cloud and everything in between.
JWT & Secure Token Handling
JWT is a token format often used to carry signed claims between parties. JWT itself is not a complete authentication architecture. Security depends on how tokens are issued, validated, stored, transported, expired, rotated, and revoked or otherwise invalidated.
28 Sep 2026 · 27 views
Authentication & Authorization
Authentication identifies a user. Authorization determines what that user is permitted to do. A production React application normally handles authentication state, protected routes, session expiration, permission-based UI, and API authorization while relying on the backend as the security authority.
28 Sep 2026 · 30 views
Error Handling
Production error handling has several layers: validation errors, network failures, API errors, rendering errors, authentication failures, and unexpected application errors. Each should have an appropriate recovery path.
28 Sep 2026 · 19 views
Error Boundries
Error Boundaries protect a React UI from certain rendering errors in descendant components. They let an application show a fallback screen instead of losing the entire visible application when a component throws during rendering.
28 Sep 2026 · 20 views
End-to-End Testing — Playwright / Cypress
End-to-end tests verify the application from the user's perspective in a real browser. They are especially valuable for critical workflows such as login, checkout, payments, employee creation, and report generation.
28 Sep 2026 · 23 views
Mocking API Calls
API mocking lets frontend tests reproduce success, validation errors, authorization failures, delays, and server failures without depending on a live backend. A good mock behaves like the real API contract rather than simply returning whatever makes the test pass.
28 Sep 2026 · 23 views
Integration Testing
Integration testing verifies that multiple pieces work together. In React, an integration test might render a page with routing, Redux, form validation, and a mocked API, then perform a realistic user workflow from start to finish.
28 Sep 2026 · 20 views
Component Testing — React Testing Library
React Testing Library focuses on testing components from the user's perspective. Instead of asking whether a specific internal function was called, the test asks whether the user can see text, click a button, enter data, and observe the expected result.
28 Sep 2026 · 21 views
Unit Testing — Jest / Vitest
Unit testing verifies small pieces of application logic in isolation. In a React application this commonly means testing utility functions, reducers, selectors, validation rules, hooks, and business logic without rendering the complete application. A strong test suite checks behavior rather than implementation details.
28 Sep 2026 · 22 views