Page 2 - React

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Streaming SSR in Depth: Suspense, Selective Hydration & TTFB

Maxim Mironjuk - April 11, 2026

Streaming SSR splits a server response into several chunks instead of waiting for complete HTML before sending anything to the browser at all. React Suspense defines the boundaries where individual parts of a page are delivered later, while quickly available content becomes visible immediately.

React

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React Strict Mode: What It Really Checks (and Why It Nags)

Maxim Mironjuk - April 06, 2026

React StrictMode is not an optional comfort feature, it is an early-warning system for bugs that fail silently and treacherously in production. Why it renders components twice, fires useEffect twice, and what all of that has to do with Concurrent Features.

React

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Next.js App Router Migration from the Pages Router: The Complete Guide

Maxim Mironjuk - April 06, 2026

The App Router is not just a new directory, it fundamentally changes the mental model of Next.js. Layouts, Server Components, nested routes and the new data fetching paradigm require a thought-out migration plan that avoids production outages and does not overwhelm the team.

React

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Form State Libraries Compared: RHF, Formik, TanStack Form

Maxim Mironjuk - April 05, 2026

Managing a twenty field form with its own validation state per field through useState quickly leads to dozens of rerenders per keystroke. Form state libraries encapsulate this complexity, but differ fundamentally in architecture, performance and integration with schema validation.

React

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TanStack Query v5: Mastering Server State

Maxim Mironjuk - April 04, 2026

Manually managed server state in React always leads to the same problems: duplicate requests, stale data, inconsistent loading states and boilerplate spread across hundreds of components. TanStack Query v5 solves this with a declarative caching and synchronization system that turns server responses into a reactive, automatically synchronized part of the UI state.

React

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TanStack Query Mutations: Optimistic Updates and Cache Invalidation in Detail

Maxim Mironjuk - April 03, 2026

A POST request is quick to fire off, the real work starts afterwards: updating the cache, invalidating affected queries, cleanly rolling back on failure. useMutation offers a clear API pattern for this instead of scattered handler logic.

React Testing/E2E

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MSW: Mock Service Worker for React API Tests Without a Backend

Maxim Mironjuk - April 01, 2026

Anyone testing React components that load data faces the same question: mock fetch or test against a real backend. MSW (Mock Service Worker) intercepts network requests at the protocol level, so components execute exactly the code they also run in production, while responses stay fully under control.

React Barrierefreiheit

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Screen Reader Testing for React Apps: NVDA, VoiceOver, jest-axe

Maxim Mironjuk - March 31, 2026

A green jest-axe report does not mean a React application is actually usable with NVDA or VoiceOver. Automated tools find structural ARIA errors, but not confusing announcement order or illogical focus jumps. This guide shows how to build screen reader testing for React apps systematically across both layers.

React Web Performance

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React Suspense: Managing Loading States Elegantly

Maxim Mironjuk - March 22, 2026

Suspense is far more than a spinner wrapper for React.lazy. In React 18 and 19 it coordinates parallel data fetches, prevents layout shifts, and makes loading states declarative, without a single isLoading boolean.

React Testing/E2E

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Testing Custom Hooks in Isolation: renderHook in Practice

Maxim Mironjuk - March 21, 2026

A custom hook too often gets tested only indirectly through the component that uses it. That hides bugs in the hook logic and makes tests unnecessarily complex. renderHook from React Testing Library lets you check a hook's state, side effects and async updates directly, with no artificial host component at all.