Web development
Development, infrastructure, SEO, AI and IT for business — short and to the point.
105 articles
- Web development4 min
How to Add a Map to a Website: Google Maps, Yandex Maps, Leaflet
For a single "how to find us" pin, an iframe embed is enough; for many markers and custom logic use a JS API or Leaflet, and load the map lazily only when the visitor scrolls to it.
Practice - Web development4 min
ARIA Attributes Guide: When and How to Use Them
ARIA tells assistive technologies an element's role, name and state but adds no behavior; use it only where no suitable native HTML element exists.
Practice - Web development4 min
Astro vs Next.js for Content Sites, Blogs and Landing Pages
If a site is mostly text and pages, Astro ships minimal JavaScript and loads fast out of the box; if it contains a lot of interactivity, user accounts and logic, Next.js is the better fit.
Basics - Web development4 min
Chrome DevTools Guide for Web Developers
Chrome DevTools is a toolkit built into the browser: Elements for layout, Console for errors, Network for requests, Performance for speed, Application for storage and Lighthouse for audits.
Practice - Web development4 min
How the Browser Event Loop Works: Tasks, Microtasks, Rendering
The browser takes one task, runs it to completion, drains the whole microtask queue and only then may paint a frame; while your code runs, the page neither repaints nor responds to clicks.
Advanced - Web development4 min
How to Turn a Website into a PWA: Manifest and Service Worker
A site becomes a PWA with three things: HTTPS, a manifest file with name and icons, and a service worker that caches assets and serves an offline page without a network.
Practice - Web development4 min
How to Build a REST API with Node.js and Express
Create an Express project, split code into routes, controllers and a data layer, validate input with a schema, handle errors in a single middleware and test the endpoints with an HTTP client.
Practice - Web development3 min
Bun vs Deno vs Node.js: JavaScript Runtimes Compared
For most production projects Node.js is still the safest choice; Bun stands out for speed and built-in tooling, Deno for its security model and out-of-the-box TypeScript.
Basics - Web development3 min
Code Splitting and Lazy Loading in JavaScript Apps
Code splitting breaks your bundle into chunks loaded only when needed: routes separately, heavy components via dynamic import, with prefetching to load likely next steps ahead of time.
Practice - Web development4 min
Cookies vs localStorage vs sessionStorage: Where to Store Data
Cookies travel to the server with every request and suit sessions with HttpOnly and Secure flags; localStorage keeps non-secret settings long-term, sessionStorage until the tab closes.
Practice - Web development3 min
CORS Explained: Why the Error Happens and How to Fix It
A CORS error comes from the browser, not the server, and it is fixed on the server, which must explicitly allow your origin with the right headers instead of disabling protection.
Practice - Web development4 min
Critical Rendering Path: How the Browser Draws a Page
The Critical Rendering Path is the chain of steps from receiving HTML to the first pixels on screen; the fewer blocking CSS and JS files at its start, the sooner users see the page.
Advanced - Web development4 min
Cross-Browser Compatibility: How to Test and Fix a Website
Cross-browser compatibility means agreeing on a list of target browsers, letting tools add prefixes and polyfills for that list, and testing the key user flows on real Safari, Android and in-app WebViews such as Telegram.
Practice - Web development3 min
CSR vs SSR vs SSG vs ISR: Rendering Strategies Explained
The difference is where and when HTML is built: in the browser (CSR), on the server per request (SSR), once at build time (SSG), or at build time with periodic updates (ISR). Content sites fit SSG and ISR, personal pages fit SSR, private panels fit CSR.
Basics - Web development4 min
CSS Variables (Custom Properties): A Practical Guide
A CSS variable is declared as --name: value and read with var(--name); it inherits down the tree and can change in media queries and from JavaScript right in the browser, which is what sets it apart from Sass variables.
Basics - Web development3 min
CSS Flexbox Guide: Properties and Layout Examples
Flexbox lays elements out along one axis: a container with display: flex controls direction, alignment and gaps, while items control how they grow and shrink.
Practice - Web development4 min
CSS Grid Layout Guide: From Basics to Real Page Layouts
CSS Grid lays out elements in rows and columns at once: you define the grid tracks on the container and items drop into cells or named areas, which makes it ideal for page layouts.
Practice - Web development4 min
CSS Position: Static, Relative, Absolute, Fixed and Sticky
static is normal flow, relative shifts an element while keeping its space, absolute and fixed take it out of flow and position it from a positioned ancestor or the viewport, and sticky sticks on scroll within its parent.
Basics - Web development4 min
CSS Units Explained: px, em, rem, %, vw and vh
px is a fixed size, rem follows the root font, em follows the current or parent font, % follows the parent box and vw/vh follow the viewport; rem works best for fonts and spacing, and dvh or svh for full-screen blocks on mobile.
Basics - Web development3 min
Web Animations: CSS vs JavaScript, GSAP and Motion
Handle simple state changes (hover, reveal, expand) with CSS and complex sequences or scroll-driven scenes with GSAP or Motion; animate only transform and opacity, and turn motion down for prefers-reduced-motion.
Practice - Web development3 min
How to Add Dark Mode to a Website the Right Way
Define colors as CSS variables, follow the system theme via prefers-color-scheme by default, store the user's choice in localStorage and apply it with a tiny script in the head before the page paints.
Practice - Web development3 min
End-to-End Testing for Web Apps: Playwright vs Cypress
E2E tests check key user journeys end to end in a real browser. Playwright is stronger in cross-browser support, parallelism and multiple tabs; Cypress shines in interactive debugging. For new projects Playwright is the more common pick.
Practice - Web development4 min
ES Modules vs CommonJS: import vs require in JavaScript
CommonJS (require) is the older synchronous module system of Node.js, ES Modules (import) is the official language standard; Node.js picks the system by file extension and the type field in package.json.
Basics - Web development4 min
Express vs NestJS vs Fastify: Choosing a Node.js Framework
Express is the simple, flexible choice for small services, Fastify is fast with built-in schema validation, and NestJS offers a strict modular architecture for large teams and long-lived projects.
Practice - Web development4 min
Feature-Sliced Design: Scalable Frontend Architecture Explained
Feature-Sliced Design splits a frontend into layers ordered by responsibility, each layer into business-domain slices, and each slice into technical segments; modules may import only from layers below them and only through a slice's public API.
Advanced - Web development3 min
Flexbox vs CSS Grid: When to Use Which
Flexbox lays items out along one axis, a row or a column, while Grid controls rows and columns at the same time. Use Flexbox for components, Grid for page structure and grids, and combine them freely.
Basics - Web development4 min
Frontend vs Backend: What Is the Difference
The frontend is everything users see and click in a browser or app; the backend is the server-side logic, data and integrations. The two are connected through an API.
Basics - Web development4 min
What Is a Headless CMS: Strapi, Sanity, Payload Compared
A headless CMS stores and edits content but does not render it — a website, app or bot fetches the data via API, giving you frontend freedom at the cost of more complex development.
Basics - Web development3 min
How to Choose a CMS for Your Website
Choose a CMS by your content and your people, not by popularity: WordPress fits a typical site with a blog, a headless CMS fits complex frontends and multiple channels, and a custom admin fits unique business logic.
Practice - Web development3 min
How to Choose a Frontend Framework for a Web Project
Start with project type and team skills: Astro for content sites, React or Vue with SSR for SEO-driven products, Angular for large enterprise systems.
Practice - Web development3 min
How Websites Work: Client, Server, HTTP and the Browser
A website is a conversation: the browser (client) finds the server through DNS, sends an HTTP request, and the server returns HTML, CSS, JavaScript and data that the browser turns into a page.
Basics - Web development4 min
Browser Caching: Cache-Control, ETag and Cache Busting
Cache hashed static files for a year with immutable and serve HTML with no-cache plus an ETag, so users get updates immediately while repeat visits stay almost instant.
Practice - Web development4 min
HTTP Methods and Status Codes Every Developer Should Know
The method says what to do with a resource and the status code says how it ended; GET, PUT and DELETE are idempotent, POST is not, and client errors (4xx) must be clearly separated from server errors (5xx).
Basics - Web development3 min
Image Optimization for the Web: WebP, AVIF, srcset, Lazy Loading
Serve WebP or AVIF, size images to the screen with srcset and sizes, lazy-load only below the fold, always set width and height, and automate it with your build or an image CDN.
Practice - Web development4 min
Infinite Scroll vs Pagination vs Load More: Which to Build
For catalogs and search, where people need to find and return, use pagination or Load More with page URLs; infinite scroll suits feeds that people browse without a specific goal.
Practice - Web development4 min
How to Use the Fetch API: Requests, Errors, Timeouts, Abort
fetch only rejects on network failure, so you must check response.ok yourself, and timeouts and cancellation are done with AbortController or AbortSignal.timeout.
Practice - Web development3 min
Landing Page vs Corporate Website vs Web App: What You Need
A landing page sells one offer to one segment, a corporate website explains the company and its services, and a web app does work for the user. The goal defines the format, not the budget.
Basics - Web development4 min
How to Read a Lighthouse Report and Fix the Issues
Lighthouse is a lab test that scores Performance, Accessibility, Best Practices and SEO; read the metrics and failed audits rather than the single score, run it in clean conditions several times, and fix images, JavaScript and render-blocking resources first.
Practice - Web development4 min
Micro-Frontends: When Splitting a Frontend Makes Sense
Micro-frontends split one interface into parts that different teams build and deploy independently; they solve an organizational problem and are almost always overkill for a single small team.
Advanced - Web development4 min
Monorepo for Web Projects: Turborepo, Nx and pnpm Workspaces
A monorepo keeps the website, admin, API and shared packages in one repository; pnpm workspaces link the packages, while Turborepo or Nx speed up builds with caching and running only affected tasks.
Advanced - Web development3 min
How to Build a Multilingual Website: i18n in Practice
A multilingual site rests on four decisions: a separate URL per language, translations in keyed files, gentle locale detection without forced redirects, and formatting numbers, dates and plurals with Intl.
Practice - Web development4 min
Next.js App Router Guide: Layouts, Routing and Server Actions
In the App Router every folder in app/ is a URL segment, and the special files page, layout, loading and error define the page, its wrapper and its states; data changes go through Server Actions without a separate API.
Practice - Web development4 min
How to Add Authentication to Next.js: Auth.js, Clerk or Custom
Clerk is the fastest start but keeps user data with a third party and costs more as you grow; Auth.js is free and stores users in your database; custom auth gives full control. In any case, check the session inside every server component and server action, not only in middleware.
Practice - Web development4 min
Data Fetching and Caching in Next.js: A Practical Deep Dive
In Next.js you decide what gets cached and for how long: refresh data on a timer or by tag after a change, and stream dynamic parts with Suspense. Stale data almost always means a page or request was cached when you did not expect it.
Advanced - Web development4 min
SEO in Next.js: Metadata, Sitemap, robots.txt and OG Images
In the App Router, SEO is set with the metadata export or generateMetadata, special files sitemap.ts, robots.ts and opengraph-image.tsx, plus a JSON-LD script; for multilingual routes every page needs a canonical URL and hreflang alternates.
Practice - Web development4 min
Next.js or Plain React with Vite: Which Do You Need
If your pages must rank in search and open fast on the first visit, pick Next.js; if it is an app behind a login with no SEO needs, React with Vite is simpler and cheaper to maintain.
Basics - Web development4 min
Node.js vs PHP for Web Backend: Honest Comparison
Both stacks fit most websites. Node.js is stronger for real-time and a single JavaScript stack, PHP with Laravel for classic sites, admin panels and cheap hosting; the team and the project usually decide.
Basics - Web development3 min
npm vs Yarn vs pnpm: Which Package Manager to Use
npm is the reliable default, pnpm saves disk space and enforces stricter dependencies, which shines in monorepos, and Yarn suits teams that want its special modes; above all, use one manager and one lockfile per project.
Practice - Web development4 min
Nuxt vs Next.js: Comparing Meta-Frameworks
Nuxt and Next.js are close in capabilities, so the choice is driven by the library, not the framework: a Vue team picks Nuxt, a React team picks Next.js.
Basics - Web development4 min
How to Document an API with OpenAPI and Swagger
Describe your API in one OpenAPI file (YAML or JSON), render it with Swagger UI or Redoc, generate clients from it, and check automatically in CI that it still matches the code.
Practice - Web development5 min
Optimistic UI Updates in React: Patterns and Rollback
Optimistic UI shows the expected result immediately and syncs with the server in the background; it needs a snapshot for rollback, protection from races and duplicates, and should never be used where a false "success" costs money.
Advanced - Web development4 min
package.json Explained: Dependencies, Scripts and Semver
package.json is the passport of a JavaScript project: it lists the name, scripts and dependencies with version ranges, while the lock file pins exact versions so every install builds the same thing.
Basics - Web development4 min
Forms in React with React Hook Form and Zod Validation
React Hook Form manages fields and submission without extra re-renders, while a Zod schema defines validation rules once, and the same schema can validate data on the server.
Practice - Web development3 min
React Hooks Guide: useState, useEffect, useRef and More
Hooks are functions that give a component state (useState), side effects (useEffect) and references (useRef); call them only at the top level and list dependencies honestly.
Practice - Web development4 min
React Performance Optimization: memo, useMemo and Re-renders
Measure in the React Profiler first, fix the cause of unnecessary re-renders through component structure, and only then add memo, useMemo and virtualization where they actually help.
Advanced - Web development3 min
How to Structure a React Project: Folders and Conventions
Grouping by file type is fine for small projects, but a growing app is better split by feature: everything for one feature lives in one folder, and shared code goes to shared.
Practice - Web development4 min
React Server Components Explained: How They Work and Why
Server Components run only on the server and never ship to the browser bundle; interactive parts go into Client Components marked "use client", and only serializable data crosses between them.
Advanced - Web development3 min
React State Management: Context vs Redux vs Zustand
First separate server data (give it to TanStack Query) from client state; Context is enough for rarely changing globals, Zustand for frequent updates, Redux Toolkit for large teams that need strict rules.
Practice - Web development4 min
React UI Libraries Compared: MUI vs Ant Design vs shadcn/ui
Ant Design is the fastest way to build a data-heavy admin panel, MUI is a balanced choice with a strong theming system, and shadcn/ui suits projects with a custom design because you own and edit the component code.
Practice - Web development4 min
React vs Angular: Library or Full Framework
React is a flexible library where you assemble the stack for the task. Angular is a full framework with strict structure, suited to large teams and long-lived projects.
Basics - Web development4 min
React vs Vue: Comparison for Your Next Project
Both are fit for serious products. React wins on ecosystem size and the developer market, Vue on an easier start and official built-in solutions.
Basics - Web development4 min
How to Analyze and Reduce JavaScript Bundle Size
Inspect the bundle with an analyzer to find the largest modules, then apply tree shaking, replace heavy dependencies, narrow polyfills and move work to the server, recording the size before and after each step.
Advanced - Web development3 min
Responsive Web Design: Media Queries, Breakpoints and Mobile First
Responsive design starts with the viewport tag and base styles for mobile, which media queries then extend for larger screens. Set breakpoints where content breaks, scale type with clamp() and adapt components with container queries.
Practice - Web development4 min
REST API Design Best Practices: Naming, Versioning, Errors
A good REST API is predictable: plural nouns in URLs, uniform pagination and filter rules, an explicit version, one error format across all endpoints and idempotency keys for operations that must not be repeated.
Practice - Web development4 min
REST vs GraphQL: Which API Style to Choose
REST is simpler, caches better and fits most public and CRUD APIs; GraphQL wins with many different clients and complex screens with nested data, but demands more discipline on the server.
Basics - Web development4 min
Sass vs CSS Modules vs CSS-in-JS: How to Style a Modern App
Sass is a preprocessor for writing CSS more comfortably, CSS Modules scope classes per file, and CSS-in-JS defines styles in JavaScript. For most React apps with SSR, CSS Modules (optionally with Sass) or zero-runtime CSS-in-JS is the safe choice.
Practice - Web development4 min
Semantic HTML: Which Tags to Use and Why It Matters
Semantic HTML means choosing tags by what content is (header, nav, main, article, button), not by how it looks, so screen readers, search engines and developers understand the page.
Basics - Web development4 min
Session vs JWT: How to Implement Login in Web Apps
For a typical web app, server-side sessions in an httpOnly cookie are the safe default; JWT with refresh tokens makes sense for mobile clients, multiple services and external APIs.
Practice - Web development4 min
SPA vs MPA: Single-Page vs Multi-Page Applications
An MPA loads a new HTML page on every navigation and is simpler for SEO and content sites; an SPA loads once and swaps screens on the client, which suits complex apps. Today most projects choose a hybrid.
Basics - Web development4 min
Tailwind CSS vs Bootstrap: Which CSS Framework to Choose
Bootstrap gives you ready-made components and a fast start, but sites built on it look alike without serious rework. Tailwind CSS gives you utilities to build your own design and usually wins when you have a custom layout and a design system.
Practice - Web development4 min
TanStack Query vs SWR: Managing Server State in React
Both libraries cache server data and refresh it automatically; SWR is lighter and simpler for read-heavy apps, while TanStack Query gives more control over mutations, invalidation and debugging in large apps.
Practice - Web development3 min
TypeScript with React: Typing Props, State, Events and Hooks
Describe props with a type, let hooks infer what they can, take event types from React and validate API data at the boundary — that covers most real cases.
Practice - Web development4 min
Vite vs Webpack: Modern Frontend Build Tools Compared
For a new project Vite is usually simpler and faster; Webpack remains a sensible choice for large legacy projects with complex custom configuration where migration would not pay off.
Practice - Web development4 min
Web Accessibility Checklist for Developers
Make sure everything works by keyboard with visible focus, images and fields have text names, contrast is sufficient, markup is semantic, motion respects reduced motion, then test with axe and a screen reader.
Practice - Web development4 min
Web Components Explained: Custom Elements and Shadow DOM
Web Components are browser standards for building your own HTML tags with isolated styles; they shine in design systems and widgets that must work in any framework.
Advanced - Web development4 min
Web Fonts: How to Load Fonts Fast Without Layout Shifts
Serve WOFF2 from your own domain, split fonts into unicode-range subsets, preload only the key file, pick a font-display value and match the fallback font's metrics, so text appears at once and the layout does not jump.
Practice - Web development3 min
Web Forms Done Right: Validation, Errors and UX in Code
A good form validates twice, on the client for convenience and on the server for safety, using one shared schema, and shows clear errors right next to the field.
Practice - Web development4 min
Website Speed Optimization Checklist for Developers
Measure first (Lighthouse plus field Core Web Vitals data), then work through server response, network, images, JS, CSS, fonts and third-party scripts, re-measuring after every change.
Practice - Web development4 min
How to Make a Website Contact Form Send Emails Reliably
A reliable form first saves the lead (database, CRM or Telegram) and only then sends an email through a transactional service from a domain with SPF, DKIM and DMARC; a honeypot and rate limits stop most spam.
Practice - Web development4 min
WebSockets vs Server-Sent Events vs Polling for Real-Time Apps
Use WebSockets for two-way exchange (chats, collaborative editing, games), SSE for server-only event streams (notifications, dashboards, AI response streaming), and keep polling as a simple fallback.
Advanced - Web development3 min
What Are Webhooks and How They Differ from APIs
A webhook is a callback: an external service sends an HTTP request to your URL when something happens, instead of you repeatedly asking it through an API.
Basics - Web development4 min
What Happens When You Type a URL and Press Enter
The browser finds the IP via DNS, opens a secure connection (TCP + TLS), sends an HTTP request, receives HTML, loads CSS, JS and images, then builds and paints the page.
Basics - Web development3 min
What Is CSS: Selectors, Cascade and Specificity Explained
CSS is the styling language: a selector picks elements, a rule sets styles, and in a conflict the declaration with higher specificity wins or, if equal, the one that comes last.
Basics - Web development3 min
What Is the DOM and How JavaScript Changes a Page
The DOM is a live tree of objects the browser builds from HTML; JavaScript finds nodes in it, changes them and reacts to events, and the browser redraws the page right away.
Basics - Web development3 min
What Is GraphQL and How It Works
GraphQL is an API query language where the client describes exactly which fields it needs and gets them in one request through a single endpoint, while the server defines available data in a strictly typed schema.
Basics - Web development3 min
What Is HTML and How a Web Page Is Structured
HTML is a markup language that describes a page's structure with tags: headings, paragraphs, links, images, forms. The browser reads HTML and turns it into what you see on screen.
Basics - Web development4 min
What Is htmx and When You Do Not Need a JS Framework
htmx is a small library that updates parts of a page with HTML fragments from the server via attributes; for forms, search, tables and admin panels it often replaces React or Vue, but it does not suit rich client-side interfaces.
Basics - Web development3 min
What Is Hydration and How to Fix Hydration Errors
Hydration is when React in the browser brings ready server HTML to life by attaching event handlers to it. A hydration error happens when the first browser render differs from the server one, and the fix is to move anything unstable (dates, random values, window) into an effect or a client-only component.
Advanced - Web development4 min
What Is Jamstack and When It Fits Your Website
Jamstack means building pages in advance and serving them from a CDN while JavaScript and APIs handle everything dynamic; it fits content sites very well and suits projects with constantly changing data less.
Basics - Web development4 min
What Is JavaScript and What It Does on a Website
JavaScript is the programming language that makes a page come alive: it reacts to user actions, validates forms and loads data without a reload, while HTML holds the content and CSS handles the look.
Basics - Web development4 min
What Is JSON and How Web Apps Exchange Data
JSON is a text format for structured data — objects, arrays, strings, numbers, true/false and null; frontends and backends use it to exchange data over HTTP with the Content-Type: application/json header.
Basics - Web development3 min
What Is Laravel and Which Web Projects It Suits
Laravel is a popular PHP framework with routing, an ORM, templating, queues and authentication built in; it is a strong fit for admin panels, CRMs, APIs and e-commerce backends.
Basics - Web development3 min
What Is Next.js and What It Adds on Top of React
Next.js is a framework built on React that adds file-based routing, server rendering, backend endpoints and built-in optimization so sites load fast and index well.
Basics - Web development3 min
What Is Node.js and What It Is Used For
Node.js is a runtime that runs JavaScript on the server. It shines for APIs, real-time apps and developer tooling, but is a poor fit for heavy CPU-bound computation on a single thread.
Basics - Web development3 min
What Is a PWA (Progressive Web App) and What It Can Do
A PWA is a website you can install on a phone or computer like an app, open without the address bar and partly use offline; it costs less than two native apps but does not get full access to device capabilities.
Basics - Web development4 min
What Is React and Why It Is So Popular
React is a JavaScript library for building interfaces from components: you describe how the screen should look for a given state, and React updates the right parts of the page itself.
Basics - Web development3 min
What Is a REST API: Simple Explanation with Examples
A REST API is an agreement for programs to exchange data over HTTP: every object is a resource with its own address, and the action on it is set by GET, POST, PUT, PATCH or DELETE.
Basics - Web development4 min
What Is Svelte and SvelteKit: How It Differs from React
Svelte is a compiler-based framework that turns components into lean JavaScript without a virtual DOM, and SvelteKit adds routing, SSR and server logic on top; React wins on ecosystem and the hiring market.
Basics - Web development4 min
tRPC Explained: End-to-End Type-Safe APIs Without REST
tRPC lets a TypeScript client call server functions directly, inferring input and output types from the server code with no schema files or code generation; it shines when one team owns both sides in a TypeScript monorepo and is the wrong choice for public or multi-language APIs.
Advanced - Web development4 min
What Is Vue.js: A Beginner's Overview
Vue.js is a JavaScript framework for building interfaces where each component lives in one file and the page updates itself when data changes. New projects usually use the Composition API, Pinia for shared state and Vue Router for pages.
Basics - Web development4 min
What Is Web Accessibility and the WCAG Standard
Accessibility means everyone can use a site, including people with visual, hearing and motor impairments; WCAG is the international standard with testable criteria, and level AA is the usual target.
Basics - Web development3 min
What Is WebAssembly and When to Use It in the Browser
WebAssembly is a compact binary format the browser runs at near-native speed next to JavaScript; use it for heavy computation and porting existing code, not for ordinary interfaces.
Advanced - Web development3 min
What Is WordPress and What Sites You Can Build with It
WordPress is a free PHP and MySQL content management system that works well for blogs, company sites, landing pages and small stores, but fits complex business logic and heavy load less well.
Basics - Web development4 min
How to Speed Up a WordPress Site: Practical Guide
Measure first, then remove unneeded plugins, enable page caching, compress images, update PHP, lighten the theme and add an object cache — and re-measure after every step.
Practice - Web development4 min
WordPress vs Custom Development: Which Is Right for Your Site
WordPress pays off when you need a standard content site fast and without complex logic; custom development is justified when the site is a product with unique flows, integrations and performance demands.
Basics
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