freeCodeCamp

Building a Website in 2026: What Matters More Than Your Tech Stack

Manish Shivanandhan |
For years, developers have debated which technology stack was best for building websites. Some preferred React. Others chose Vue, Angular, Svelte, or server-side frameworks such as Laravel and Django.... read more

How to Run Private Text-to-Speech on Your Own Hardware Using QVAC

Djibril-MšŸ€ |
When I was putting the final touches on QuizRope, an educational mobile app I built that uses LLMs for real-time tutoring and homework assistance, I knew the next logical step was voice. Reading text... read more

Mastra vs LangChain: Building an AI Agent Pipeline and Analyzing the Data

Shola Jegede |
A week ago, I saw this tweet: I had just shipped SupportMesh, a multi-tenant AI support platform built on Mastra, so I had opinions from production. I liked the .dowhile() loop, the typed step schem... read more

How Large-Scale Platforms Handle Millions of Daily Transactions

Manish Shivanandhan |
Every day, millions of people order food, stream videos, send messages, book rides, make payments, and shop online. Most of these actions take only a few seconds from the user's perspective. A user cl... read more

The Saga Pattern in Node.js: How to Roll Back Distributed Transactions Across Microservices

Md Tarikul Islam |
Building reliable workflows across multiple microservices is challenging. In a monolith, a database transaction can ensure that multiple operations either succeed or fail together. But once data is sp... read more

How to Build a Browser-Based PDF Crop Tool Using JavaScript

Bhavin Sheth |
PDF files often contain unwanted margins, blank spaces, scanner borders, page headers, page footers, or unnecessary content around the main document area. Cropping allows users to remove these unwante... read more

Geopolitical Risk Isn't One Thing. I Built a Python Framework to ProveĀ It

Nikhil Adithyan |
On April 3, 2025, the US announced sweeping tariffs on Chinese imports. SPY dropped 4.8% that day. The next day, it dropped another 6%. Financial news ran the usual headline: markets rattled by geopol... read more

How to Build a Case Converter Tool Using HTML, CSS, and JavaScript

Bansidhar Kadiya |
If you're looking to level up your front-end development skills by building a practical web utility, this is the guide for you. We'll code a fully functional Case Converter Tool from scratch using onl... read more

From Flutter to Backend: How to Build Production-Grade REST APIs with Dart and Dart Frog

Oluwaseyi Fatunmole |
Dart backend frameworks exist on a spectrum. At the minimal end sits Shelf, with raw primitives and full control. You wire everything yourself. At the maximal end sits Serverpod. It's a full framework... read more

How to Scale Laravel Applications for High-Traffic Production Systems

Olamilekan Lamidi |
Your first scaling problem rarely arrives with a bang. For a while, everything is fine: pages load fast, the database barely breaks a sweat, and the team ships features without thinking much about inf... read more