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freecodecamp/devdocs

📈 Trending★ 38,930RubyAudience · developerComplexity · 3/5ActiveLicenseSetup · easy

TLDR

A unified documentation browser that aggregates API references for dozens of programming languages and frameworks into one searchable, offline-capable interface.

Mindmap

mindmap
  root((DevDocs))
    What it does
      Unified search
      Offline support
      Dark theme
      Keyboard nav
    How it works
      Ruby scraper
      JavaScript app
      Sinatra server
      Service worker
    Use cases
      Quick API lookup
      Multi-tech projects
      Local hosting
      Offline reference
    Tech stack
      Ruby
      JavaScript
      Sinatra
      Service workers

Things people build with this

USE CASE 1

Search API documentation for multiple languages and frameworks without switching browser tabs.

USE CASE 2

Access programming references offline while working without internet connectivity.

USE CASE 3

Host your own documentation server locally using Docker for team or personal use.

USE CASE 4

Replace scattered bookmarks with a single, keyboard-navigable reference tool for daily development.

Tech stack

RubyJavaScriptSinatraService Workers

Getting it running

Difficulty · easy Time to first run · 5min
Use freely for any purpose, including commercial use, as long as you keep the copyright notice and license text.

In plain English

DevDocs is a web-based documentation browser that brings together the API reference documentation for dozens of programming languages, frameworks, and libraries into one unified, searchable interface. Instead of jumping between separate websites for JavaScript, Python, React, CSS, and whatever other tools you use, DevDocs lets you search all of them at once from a single page at devdocs.io, or from your own locally hosted instance. It has instant search, keyboard navigation, a dark theme, and full offline support. The project is made up of two parts. The first is a Ruby-based scraper that fetches documentation from the official websites of each supported technology, strips away navigation and styling, normalizes the formatting for consistency, and saves the result as compressed local files. The second is a client-side JavaScript web app powered by a small Sinatra server that serves those files. All searching and rendering happens in the browser, with a service worker enabling offline access. The app is intentionally lightweight: the search algorithm is kept simple to stay fast even when searching across 100,000 entries. You would use DevDocs when you want a fast, offline-capable reference tool for your everyday development work. It is particularly useful when you work with many different technologies and do not want to maintain browser bookmarks for each documentation site. Developers can run it locally via Docker with a single command. The tech stack is Ruby for the scraper and build tooling, JavaScript for the web application front-end, and Sinatra (a lightweight Ruby web framework) for the server layer.

Copy-paste prompts

Prompt 1
How do I set up DevDocs locally using Docker so I can search my favorite frameworks offline?
Prompt 2
Show me how the Ruby scraper in DevDocs extracts and normalizes documentation from official websites.
Prompt 3
How can I add a new programming language or framework to my DevDocs instance?
Prompt 4
Explain how DevDocs uses service workers to enable offline search across 100,000+ documentation entries.
Prompt 5
What's the fastest way to search across JavaScript, Python, and React docs simultaneously in DevDocs?
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.