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🚀 OAuth 2 Sign-In with Facebook — React Authentication & Authorization Playlist

Implementing authentication from scratch can be time-consuming, especially when users expect to sign in with a single click. OAuth 2.0 authentication solves this problem by allowing users to log in using their existing accounts from providers like Facebook.In this tutorial, you'll learn how to integrate Facebook Sign-In into a React application using Firebase Authentication. Firebase securely handles the OAuth flow while React manages your application's UI.By the end of this guide, users will be

Show HN: Bento - An entire PowerPoint in one HTML file (edit+view+data+collab)

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The Science of Feeling Good: How What You Wear Changes Your Brain

There's a reason why putting on a well-fitting outfit can transform your entire mood. It's not just vanity — it's neuroscience. The emerging field of "enclothed cognition" studies how our clothing affects our psychological processes. And the findings are fascinating.What Is Enclothed Cognition?The term was coined by researchers at Northwestern University, who found that what you wear directly influences your cognitive performance and emotional state. In one study, participants who wore a lab coa

Prerendering 280 pages of a React SPA for SEO: what actually worked

We shipped a Vite + React single page app with about 280 routes: marketing pages, a blog, and a batch of programmatically generated county pages. All client rendered. The problem is not users, it is crawlers and share cards. A raw SPA serves the same index.html for every route, so anything that does not execute JavaScript sees an identical, empty shell no matter which URL it requested. This post walks through the actual prerender pipeline we run after every build, what it gets right, what it doe

You keep escaping the Promise constructor. `Promise.withResolvers` does it right.

Every JavaScript developer has written this at least once:let resolve, reject;const promise = new Promise((res, rej) =&gt; { resolve = res; reject = rej;});// Later…eventBus.on('done', () =&gt; resolve(result));You need to trigger the Promise from outside the constructor — from an event listener, a callback, or a message handler. So you capture resolve and reject by leaking them into the outer scope. It works. It also looks wrong every time you write it, because you're manually escaping a clos

Browser-Side File Conversion with WebAssembly

A few months ago, I needed to add file conversion to a web app — nothing fancy, just letting users drop in a file and get back a different format. My first instinct was "call an API, done." But sending user files to a server means storage costs, privacy headaches, and a queue if traffic spikes. So I looked into doing it entirely client-side with WebAssembly. Here's what I learned, including parts that don't appear in the getting-started tutorials. Why WASM for this at allMost format convers

A responsive breakpoint previewer with no library: an srcdoc iframe is a viewport you can hold in your hand

A responsive page has no single "size" — it renders differently at every viewport width, and the switches happen at breakpoints, widths where a @media query flips a chunk of CSS on or off. The hard part of building responsive layouts is that a normal browser only shows you one width at a time, so you resize the whole window and squint. I built a tool that fixes that — paste HTML+CSS, drag a live viewport, watch which breakpoints fire — and it has almost no logic, because the browser does all the

Pinterest masonry two ways: one-line CSS columns vs shortest-column JavaScript, and the reading-order catch

A Pinterest board is a wall of cards of wildly different heights that still tile together with no ragged row gaps. I built the whole thing — the pins, both layout techniques behind one toggle, responsive columns, and the hover Save overlay — with no library, and the interesting part turned out to be that there are two genuinely different ways to get masonry, each with its own trade-off. Here's what I learned building it. Why CSS Grid can't do thisThe instinct is to reach for Grid, but Grid

A reaction-time tester in about 90 lines: performance.now(), a random green flip, and a false-start guard

Reaction time is the oldest lab test there is — the gap between a signal appearing and your body responding. I built a full five-round tester with a running average, a best time, a false-start penalty and a little bar chart of every attempt, and the whole thing came to about 90 lines of vanilla JavaScript: no sprite sheet, no game engine, one coloured div, one random timer and a high-resolution stopwatch. Here is how it fits together. The whole game is five statesThere are no objects and no

Angular vs React: Key Differences, Pros & Cons Compared

Quick Answer: Angular is a full-featured, opinionated framework built by Google. It includes everything out of the box (routing, forms, HTTP, dependency injection). React is a UI library from Meta that handles only the view layer, giving teams more flexibility to choose their own tools. Angular suits large enterprise apps with structured teams; React suits dynamic UIs and teams that prefer composing their own stack.You've got a new project kicking off, your team is split down the middle, and som

Bringing Convention over Configuration to Fastify with @syora/fastify

Hi everyone 👋If you enjoy Fastify's performance but sometimes miss the developer experience of file-system routing, this project might interest you.I've been working for some time on @syora/fastify, a library that brings the Convention over Configuration approach to Fastify.🚀 How it worksInstead of manually declaring and importing routes, hooks, and plugins, everything is inferred from your project's directory structure.The key idea is that everything happens ahead of runtime. During startup, @s

Summarizing a PDF with AI for less than a cent: PDF.js, Gemini Flash-Lite, and a Netlify Function

I wanted to add a tool to my site's PDF cluster that summarizes uploaded documents and contracts, without blowing up costs or breaking the zero-heavy-server-processing principle I follow for every other tool. Here's the architecture I picked, the real economics behind an AI-generated summary, and an authentication snag I didn't expect: Google's newer API keys use a different format than the one I'd always worked with, and they silently break the most common authentication method used in tutorial

From Prompt to Production: Building AI Agents That Actually Work in 2026

Artificial Intelligence is rapidly moving beyond simple chat interfaces. Modern AI applications are becoming autonomous systems capable of reasoning, retrieving knowledge, interacting with APIs, and executing complex workflows.These systems are commonly known as AI agents.Unlike traditional chatbots that only generate responses, AI agents can solve problems, coordinate tasks, access business data, and automate operations across multiple software platforms.Whether you're building an enterprise as

Critical CSS & Above-the-Fold Code Generator: Boost Your Site Performance with AI Agents

Critical CSS &amp; Above-the-Fold Code Generator: Boost Your Site Performance with AI Agents\n\n## The Web Performance Challenge\n\nIn today's competitive digital landscape, website speed is paramount. Slow loading times frustrate users, harm SEO rankings, and directly impact conversion rates. A major culprit behind sluggish performance is often render-blocking CSS. When a browser encounters external stylesheets, it pauses rendering the page until all CSS files are downloaded and parsed. F

The DOCX demo was perfect. The first real contract was awful.

The first DOCX demo looked great.One page. One font. A small table. No headers. No section breaks. I thought the hard part was done.Then a customer sent a real contract.It had missing fonts, nested tables, merged cells, numbered clauses, headers, footers, page breaks, and a signature block that had to stay in the right place. Our clean demo became useless in seconds.That failure changed how I think about Office preview. A file that opens is not a file that renders correctlyParsing the ZIP p

How Our AI Agents Built an Accessible Text-to-Motion Animator in Record Time

Devlog: Accessible Text-to-Motion AnimatorIn a world where visual content reigns supreme, it's crucial to create animations that are not only engaging but also accessible. At Pixel Office, we constantly strive to push the boundaries of what's possible with AI, and our latest project, the Accessible Text-to-Motion Animator, is a shining example. The Technical Challenge: Animations for EveryoneTraditional animation creation can be time-consuming and often overlooks accessibility princip

Day 158 of Learning MERN Stack

Hello Dev Community! 👋It is officially Day 158 of my software engineering track! Today, I completed the Admin List Items Page (List.jsx) for my Tomato — Food Delivery App, connecting real-time REST API endpoints to display and delete database records seamlessly! 📦🍔⚡Managing inventory in an e-commerce platform requires fast data synchronization and immediate visual feedback upon state changes. Here is how I built the list module today. 🛠️ Deconstructing the Day 158 Admin List ModuleAs captur

Day 157 of Learning MERN Stack

Hello Dev Community! 👋It is officially Day 157 of my software engineering sprint! Today, I built the complete Admin Add Items Page (Add.jsx) for my Tomato — Food Delivery App, wiring up client-side form controls to handle binary multipart form-data requests! 📦🍕🛠️Building administrative panels requires robust data handling and instant user feedback. Here is how I structured the component. 🛠️ Key Features Built on Day 157As shown in my code editor and admin UI views (Screenshot 375, 378, and

Website Development Types Explained: A Practical Guide for Developers (2026)

If you're planning to build a website in 2026, one of the first questions you'll encounter is:"What type of website should I build?"The answer depends on your business goals, technical requirements, budget, and expected traffic. A portfolio website doesn't need the same architecture as a SaaS platform, and an eCommerce store has completely different requirements from a corporate website.In this guide, we'll explore the most common website development types, when to use each one, and the technolo

PEXFND-EX Certification Exam Preparation Guide

PEXFND-EX Certification Exam: A Complete Guide to Preparation and SuccessThe PEXFND-EX certification exam is an excellent choice for professionals who want to build a solid foundation in enterprise communication technologies and validate their technical knowledge. As organizations continue to invest in modern collaboration and communication solutions, certified professionals are becoming increasingly valuable. Earning the PEXFND-EX certification demonstrates your commitment to professional devel