freeCodeCamp

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

Abigail Rennemeyer |
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 Prove 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

How to Start your Career in Tech with freeCodeCamp - Full Talk in Spanish

Estefania Cassingena Navone |
Technology is rapidly reshaping the world. Understanding how to use free learning resources and contribute to open source projects can be very helpful to start your career in this field. We just publi... read more

Web Scraping for Beginners 2026

Beau Carnes |
If you have ever wanted to collect product data, monitor competitors, track SEO rankings, or build AI tools that pull information from the internet, you have likely run into the common frustrations of... read more