The koajs/examples repository serves as a comprehensive collection of small, focused example applications demonstrating how to use Koa for building web applications and HTTP servers. Koa is an express-like framework for Node.js that emphasizes async/await patterns and middleware composition, and this repository provides practical illustrations of its core capabilities across a range of common web development scenarios.
The repository contains twenty included examples covering fundamental web development patterns. These examples span basic functionality like hello-world applications and 404 error handling, through to more sophisticated features including multi-route applications with view rendering, request body parsing, cookie management, and CSRF protection. The examples demonstrate middleware composition and conditional middleware application, showing developers how to structure reusable components. File and object streaming examples illustrate Koa's capabilities for handling data flows, including server-side events streaming and view streaming. Additional examples cover authentication via base-auth middleware, flash messaging, content negotiation, multipart file downloads, and virtual host configuration. The repository also includes examples for common tasks like multi-file uploading and template-based view rendering.
Beyond the core examples, the repository curates an extensive list of external example repositories that showcase Koa in real-world applications. These range from minimal boilerplate frameworks like coko to full-featured applications such as cnpmjs.org, a private npm registry built on Koa and MySQL. The curated list includes REST API implementations, content management systems, blogging platforms with MongoDB integration, and more complex applications like hacknical, a GitHub-based resume builder using Koa v2 with Redis and Mongoose. Several examples demonstrate integration with modern frontend frameworks, including a todo application built with React and a single-page application using Vue 2.4 on the frontend with Koa 2.3 on the backend.
The repository also maintains curated lists of boilerplates and Yeoman generators designed to accelerate Koa project initialization. These resources provide starting templates with various technology stacks, including TypeScript support, Docker containerization, testing frameworks, and authentication mechanisms. The boilerplates range from minimal setups to comprehensive starter kits featuring database migrations, JWT authentication, and API documentation via Swagger.
GitGenius activity data indicates this repository maintains connections with major open-source projects including Microsoft's VSCode and TypeScript repositories, as well as the Rust language repository, suggesting it draws contributors from significant technology communities. The repository is classified across multiple domains including API development, web application development, request handling, and middleware patterns, reflecting its broad utility as an educational resource for the Koa ecosystem. The repository includes references to external articles on building RESTful APIs with Koa and Postgres, and implementing user authentication with Passport and Koa, providing additional learning resources beyond the code examples themselves.
