--- title: Best freeCodeCamp posts — July 2026 | daily.dev description: The most upvoted freeCodeCamp posts from July 2026, curated by the daily.dev community. canonical: https://daily.dev/sources/freecodecamp/best-of/2026/07 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/freecodecamp/best-of/2026/07 og:type: website og:site_name: daily.dev og:title: Best freeCodeCamp posts — July 2026 | daily.dev og:description: The most upvoted freeCodeCamp posts from July 2026, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of freeCodeCamp — July 2026 1. 1 [](https://daily.dev/posts/level-up-your-react-skills-with-typescript-tavhnaidj "Level Up Your React Skills with Typescript") Article freeCodeCamp · 9w Level Up Your React Skills with Typescript A freeCodeCamp tutorial teaching how to use TypeScript with React, covering TypeScript basics, typing useState, component architecture with custom prop types, and passing typed function props between components. The course walks through refactoring a real-world project to be fully type-safe, improving readability and maintainability. Available as a 1-hour video on YouTube. 247 10 2. 2 [](https://daily.dev/posts/mastering-javascript-dates-and-times-tqkrojatz "Mastering JavaScript Dates and Times") Article freeCodeCamp · 10w Mastering JavaScript Dates and Times A comprehensive 2-hour freeCodeCamp course on handling dates and times in JavaScript. Covers epoch time, time zones, the native Date object and its pitfalls (mutation, zero-indexed months), the underrated Internationalization (INTL) API for formatting without third-party libraries, the upcoming Temporal API as a modern immutable replacement for Date, and strategies to avoid silent production bugs from DST and timezone mishandling. 59 5 3. 3 [](https://daily.dev/posts/why-it-worked-on-my-machine-still-happens-in-2026-wu83ivzac "Why "It Worked on My Machine" Still Happens in 2026") Article freeCodeCamp · 8w Why "It Worked on My Machine" Still Happens in 2026 Environment drift — differences in runtime versions, dependencies, configuration, and OS between developer machines and production — remains a leading cause of engineering waste in 2026\. The post explains why local test success doesn't guarantee production stability, how configuration mismatches cause more incidents than code bugs, and estimates that environment management consumes 15–25% of engineering capacity. It argues the root issue is an ownership problem, not a tooling one, and walks through how Platform as a Service (PaaS) tools like Render or Railway solve it by providing a single declarative application definition that runs identically across dev, staging, and production environments, including preview environments per pull request. 48 2 4. 4 [](https://daily.dev/posts/build-bulletproof-apis-using-typescript-in-express-vko6rtxgg "Build Bulletproof APIs using TypeScript in Express") Article freeCodeCamp · 7w Build Bulletproof APIs using TypeScript in Express A freeCodeCamp video course teaching how to build typed, production-ready APIs using TypeScript with Express.js. The 1-hour tutorial covers environment setup with tsconfig.json, request and response typing using TypeScript generics, modular architecture with routers and controllers, custom middleware for validation and authentication, and query parameter filtering. Students build a fully typed pet shelter API from scratch. 40 1 5. 5 [](https://daily.dev/posts/how-to-create-accessible-modals-and-pop-ups-using-html-css-and-minimal-javascript-at8bzvf5o "How to Create Accessible Modals and Pop-ups Using HTML, CSS, and Minimal JavaScript") Article freeCodeCamp · 8w How to Create Accessible Modals and Pop-ups Using HTML, CSS, and Minimal JavaScript A practical guide to building accessible modals and pop-ups using native HTML, CSS, and minimal JavaScript. Covers the \`popover\` attribute for lightweight pop-ups, the \`

\` element for true modals using the \`command\`/\`commandfor\` API or \`showModal()\`, CSS anchor positioning to tether pop-ups to their triggers, and common gotchas like avoiding direct flex/grid on popover elements, preventing background scrolling with the \`:has()\` pseudo-class, and styling the \`::backdrop\` overlay. 36 3 6. 6 [](https://daily.dev/posts/how-to-build-a-dark-mode-toggle-without-javascript-nbeu3nil3 "How to Build a Dark Mode Toggle Without JavaScript") Article freeCodeCamp · 10w How to Build a Dark Mode Toggle Without JavaScript A practical guide to implementing a dark mode toggle using only HTML and CSS, without any JavaScript. The technique leverages the CSS \`:has()\` pseudo-class combined with hidden radio button inputs to detect user selection and apply theme styles. CSS variables are used to manage color tokens for light and dark themes, and the \`prefers-color-scheme\` media query ensures the toggle defaults to the user's system preference. The post also explains why building JavaScript-free websites benefits accessibility, SEO, and AI crawler visibility. 30 6 7. 7 [](https://daily.dev/posts/how-oauth-2-0-works-a-practical-guide-for-backend-developers-y3b2rqzzv "How OAuth 2.0 Works: A Practical Guide for Backend Developers") Article freeCodeCamp · 6w How OAuth 2.0 Works: A Practical Guide for Backend Developers A bottom-up explanation of OAuth 2.0 for backend developers, built around a practical TravelBuddy/Google Calendar scenario. Covers the core problem OAuth solves (delegated authorization without password sharing), the four roles, access tokens and scopes, the Authorization Code flow step-by-step, why the two-step redirect exists (front-channel vs. back-channel security), refresh tokens, PKCE for public clients, the difference between state and PKCE, OpenID Connect and JWTs, OAuth 2.1 changes, and five common production security pitfalls to avoid. 40 3 8. 8 [](https://daily.dev/posts/react-native-full-stack-course-clerk-postgres-nativewind-1jkyl8mzq "React Native Full Stack Course – Clerk, Postgres, NativeWind") Video freeCodeCamp · 9w React Native Full Stack Course – Clerk, Postgres, NativeWind A beginner-friendly full stack React Native course covering how to build a cross-platform grocery list app from scratch using Expo. The tech stack includes Clerk for authentication (with OAuth providers like Google, Apple, and GitHub), Neon PostgreSQL with Drizzle ORM for the database, NativeWind (Tailwind CSS for React Native) for styling, and Zustand for state management. The course walks through project setup, file-based routing with Expo Router, React vs React Native component differences, NativeWind configuration, Clerk integration with prebuilt native UI components, and development builds. All tools used are free to get started with. 25 9. 9 [](https://daily.dev/posts/how-an-apple-engineer-pranked-billion-dollar-lawyers-and-won--yjo7guzvh "How an Apple Engineer Pranked Billion-Dollar Lawyers (and Won)") Article freeCodeCamp · 7w How an Apple Engineer Pranked Billion-Dollar Lawyers (and Won) In the late 1980s, during a fierce trademark battle between Apple and a music company, an Apple sound designer slipped a sarcastic inside joke past the legal team through clever misdirection on paperwork. The hidden Easter egg quietly shipped in the operating system and persisted for over three decades, even appearing in modern Apple code. The full story is told in a 7-minute video on the freeCodeCamp YouTube channel. 21 10. 10 [](https://daily.dev/posts/intro-to-shaders-javascript-and-p5-js-course-for-beginners-bz2ee7ibx "Intro to Shaders: JavaScript and p5.js Course for Beginners") Article freeCodeCamp · 8w Intro to Shaders: JavaScript and p5.js Course for Beginners A beginner-friendly course on the freeCodeCamp YouTube channel teaches shader programming fundamentals using JavaScript and p5.js. Developed by Patt Vira, the one-hour course covers why shaders outperform CPU rendering, how to write GLSL code that runs on the GPU across millions of pixels simultaneously, and core concepts like coordinate mapping, shaping functions, domain repetition, and distance functions. The course culminates in building an animated glowing fractal heart, including passing variables from JavaScript to the GPU and using cosine-based color palettes. 20 2 11. 11 [](https://daily.dev/posts/relaxation-and-its-role-in-vision-the-1977-phd-thesis-that-helped-shape-modern-ai-research-zguiv8mnl ""Relaxation and its Role in Vision": The 1977 PhD Thesis That Helped Shape Modern AI Research") Article freeCodeCamp · 7w "Relaxation and its Role in Vision": The 1977 PhD Thesis That Helped Shape Modern AI Research A detailed review of Geoffrey Hinton's 1977 PhD thesis 'Relaxation and its Role in Vision', exploring how ideas introduced nearly 50 years ago foreshadowed modern AI concepts. The thesis treats visual perception as an optimization problem where competing hypotheses interact through distributed constraints until a globally consistent interpretation emerges. Key ideas covered include continuous belief values over binary decisions, distributed computation, constraint propagation, hierarchical representations, schema-based reasoning, and the SETTLE system. The review traces how these foundational concepts reappeared throughout Hinton's later work — from Boltzmann Machines and backpropagation to Deep Belief Networks and energy-based models — revealing a remarkably consistent research philosophy across five decades. 18 12. 12 [](https://daily.dev/posts/the-new-agency-stack-how-dev-shops-use-claude-cursor-and-copilot-in-production-adj1t36it "The New Agency Stack: How Dev Shops Use Claude, Cursor, and Copilot in Production") Article freeCodeCamp · 7w The New Agency Stack: How Dev Shops Use Claude, Cursor, and Copilot in Production Dev agencies have shifted AI coding tools from experimental to production-standard. Most now use a three-layer stack: chat assistants (Claude, ChatGPT) for planning and architecture, AI-native editors (Cursor) for building features across codebases, and inline assistants (GitHub Copilot) for boilerplate. The real-world workflow keeps humans in the loop — engineers break work into small tasks, review every AI-generated line, and run code through normal pull request processes. AI has compressed MVP timelines from 4–6 months to 6–12 weeks and improved test coverage, but token costs for heavy agentic use are a new expense. A 'vibecode rescue' niche has emerged for fixing AI-built apps that hit stability walls. The agencies that succeed are those with senior engineers who know when to trust the tools and when to override them. 14 13. 13 [](https://daily.dev/posts/how-mcp-is-changing-wordpress-development-lpyhqm7tc "How MCP Is Changing WordPress Development") Article freeCodeCamp · 9w How MCP Is Changing WordPress Development Model Context Protocol (MCP) is transforming WordPress development by giving AI assistants live, bidirectional access to a site's actual codebase, database, plugins, and configuration — rather than relying on copy-pasted snippets. Tools like WPVibe AI, Cursor, and Zed are already leveraging MCP to let developers audit plugins, debug conflicts, generate context-aware code, and manage multiple client sites from a single AI-assisted workflow. The shift moves AI from reactive autocomplete to an agent with real project context, lowering the effort for tedious tasks while raising the stakes for developer judgment, since mistakes can propagate faster when AI acts with greater autonomy. 13 [See all freeCodeCamp archives](/sources/freecodecamp/best-of) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/sources/freecodecamp/best-of/2026/07#page","url":"https://daily.dev/sources/freecodecamp/best-of/2026/07","name":"Best freeCodeCamp Posts — July 2026","description":"The most upvoted freeCodeCamp posts from July 2026, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/sources/freecodecamp/best-of/2026/07#items","numberOfItems":13,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/level-up-your-react-skills-with-typescript-tavhnaidj","name":"Level Up Your React Skills with Typescript"},{"@type":"ListItem","position":2,"url":"https://daily.dev/posts/mastering-javascript-dates-and-times-tqkrojatz","name":"Mastering JavaScript Dates and Times"},{"@type":"ListItem","position":3,"url":"https://daily.dev/posts/why-it-worked-on-my-machine-still-happens-in-2026-wu83ivzac","name":"Why \"It Worked on My Machine\" Still Happens in 2026"},{"@type":"ListItem","position":4,"url":"https://daily.dev/posts/build-bulletproof-apis-using-typescript-in-express-vko6rtxgg","name":"Build Bulletproof APIs using TypeScript in Express"},{"@type":"ListItem","position":5,"url":"https://daily.dev/posts/how-to-create-accessible-modals-and-pop-ups-using-html-css-and-minimal-javascript-at8bzvf5o","name":"How to Create Accessible Modals and Pop-ups Using HTML, CSS, and Minimal JavaScript"},{"@type":"ListItem","position":6,"url":"https://daily.dev/posts/how-to-build-a-dark-mode-toggle-without-javascript-nbeu3nil3","name":"How to Build a Dark Mode Toggle Without JavaScript"},{"@type":"ListItem","position":7,"url":"https://daily.dev/posts/how-oauth-2-0-works-a-practical-guide-for-backend-developers-y3b2rqzzv","name":"How OAuth 2.0 Works: A Practical Guide for Backend Developers"},{"@type":"ListItem","position":8,"url":"https://daily.dev/posts/react-native-full-stack-course-clerk-postgres-nativewind-1jkyl8mzq","name":"React Native Full Stack Course – Clerk, Postgres, NativeWind"},{"@type":"ListItem","position":9,"url":"https://daily.dev/posts/how-an-apple-engineer-pranked-billion-dollar-lawyers-and-won--yjo7guzvh","name":"How an Apple Engineer Pranked Billion-Dollar Lawyers (and Won)"},{"@type":"ListItem","position":10,"url":"https://daily.dev/posts/intro-to-shaders-javascript-and-p5-js-course-for-beginners-bz2ee7ibx","name":"Intro to Shaders: JavaScript and p5.js Course for Beginners"},{"@type":"ListItem","position":11,"url":"https://daily.dev/posts/relaxation-and-its-role-in-vision-the-1977-phd-thesis-that-helped-shape-modern-ai-research-zguiv8mnl","name":"\"Relaxation and its Role in Vision\": The 1977 PhD Thesis That Helped Shape Modern AI Research"},{"@type":"ListItem","position":12,"url":"https://daily.dev/posts/the-new-agency-stack-how-dev-shops-use-claude-cursor-and-copilot-in-production-adj1t36it","name":"The New Agency Stack: How Dev Shops Use Claude, Cursor, and Copilot in Production"},{"@type":"ListItem","position":13,"url":"https://daily.dev/posts/how-mcp-is-changing-wordpress-development-lpyhqm7tc","name":"How MCP Is Changing WordPress Development"}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sources","item":"https://daily.dev/sources"},{"@type":"ListItem","position":3,"name":"freeCodeCamp","item":"https://daily.dev/sources/freecodecamp"},{"@type":"ListItem","position":4,"name":"Best of","item":"https://daily.dev/sources/freecodecamp/best-of"},{"@type":"ListItem","position":5,"name":"July 2026"}]}]} ```