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Freecodecamp Curriculum

aradotso/trending-skills

If you're looking to contribute to freeCodeCamp or understand how their challenge system works, this walks you through the entire stack. It covers the YAML-based curriculum format they use for challenges, the Fastify API backend, and the Gatsby React frontend. You'll find practical details on creating new challenges with the helper scripts, writing test assertions, and setting up the local development environment with MongoDB and GitHub OAuth. The challenge structure is well documented with concrete examples showing how hints, seeds, and solutions map to the learning experience millions of users see. It's thorough enough that you could actually ship a pull request after reading through it, which is rare for contribution guides.

skills.sh installs: 1.4K
GitHub stars: 61
last updated: Jul 14, 2026

Install

$ npx -y skills add aradotso/trending-skills --skill freecodecamp-curriculum --agent claude-code

Installs into .claude/skills of the current project.

Files

freeCodeCamp Curriculum & Platform Development

Skill by ara.so — Daily 2026 Skills collection.

freeCodeCamp.org is a free, open-source learning platform with thousands of interactive coding challenges, certifications, and a full-stack curriculum. The codebase includes a React/TypeScript frontend, Node.js/Fastify backend, and a YAML/Markdown-based curriculum system.

Architecture Overview

freeCodeCamp/
├── api/                   # Fastify API server (TypeScript)
├── client/                # Gatsby/React frontend (TypeScript)
├── curriculum/            # All challenges and certifications (YAML/Markdown)
│   └── challenges/
│       ├── english/
│       │   ├── responsive-web-design/
│       │   ├── javascript-algorithms-and-data-structures/
│       │   └── ...
│       └── ...
├── tools/
│   ├── challenge-helper-scripts/  # CLI tools for curriculum authoring
│   └── ui-components/             # Shared React components
├── config/                # Shared configuration
└── e2e/                   # Playwright end-to-end tests

Local Development Setup

Prerequisites

SKILL.md on GitHub

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Details

Repository: github.com/aradotso/trending-skills
First seen: Apr 16, 2026

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