React

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React Lazy Loading & Code Splitting in the Right Places

Maxim Mironjuk - May 04, 2026

Code splitting is not a one-off measure but an ongoing strategy. React.lazy and dynamic imports only load JavaScript when it is genuinely needed, but only if the split boundaries sit in the right places. Too many small chunks slow down loading through HTTP overhead. Too few prevent any benefit at all. This tutorial shows how to find the balance.

React Web Performance

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React Reconciliation: How the Virtual DOM Really Works

Maxim Mironjuk - April 28, 2026

Anyone who only knows React on the surface knows that the Virtual DOM "makes things fast". Anyone who wants to build performant React apps needs to understand how the diffing algorithm decides what gets updated, and why keys, component identity and the Fiber architecture are the decisive factor.

React TypeScript

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React Internationalization: next-intl in Practice

Maxim Mironjuk - April 19, 2026

Internationalization in React is often underestimated, right up until the first multi-language requirement lands in the backlog. next-intl offers a complete i18n solution for the Next.js App Router: type-safe translations, ICU pluralization, locale-aware date and number formatting, language routing and full Server Component support without any client bundle overhead.

React

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URL as State: Why SearchParams Often Beat useState

Maxim Mironjuk - April 12, 2026

Filters, sorting, pagination and active tabs end up in useState in many React applications, even though they are really part of the address. Storing that state in the URL instead gives you deep linking, a working browser back button and shareable links for free, without an extra store.

React Web Performance

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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 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.