# chenshenhai/koa2-note

《Koa2进阶学习笔记》已完结🎄🎄🎄

Repository: https://github.com/chenshenhai/koa2-note
Canonical: https://ross.abutalabs.com/products/koa2-note
Homepage: https://chenshenhai.github.io/koa2-note
License: MIT
License Family: permissive
Topics: koa, koa2, koajs, nodejs, koa2-course, course-notes
Last push: 2022-02-12T03:58:22+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3480, "days_push": 1663, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5154, forks 1260 (observed 2026-08-28T04:09:11.426192+00:00)

## What it is
An open-source ebook (in Chinese) that is a completed beginner-to-intermediate tutorial for the Koa.js 2.x Node.js web framework. It covers routing, request parsing, static files, sessions, templates, file uploads, MySQL, JSONP, testing, and building a full project structure.

## Use cases
- learn koa2 from scratch
- understand koa middleware with async/await
- tutorial for building a node.js web app with koa
- how to handle file uploads in koa2
- koa2 session and cookie handling examples
- connect koa2 to mysql with async/await
- koa2 project structure and routing design

## When to choose
- you are starting with Koa.js 2.x and want a structured, example-driven tutorial
- you prefer reading a free open-source book with runnable code samples
- you want coverage of common web tasks (routing, uploads, sessions, MySQL) in one place

## When to avoid
- you need up-to-date documentation for the latest Koa versions or ecosystem changes
- you want English-language material
- you need advanced Koa internals or design-pattern depth (see the author's companion book instead)

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: documentation, web-framework, developer-tools
- domain: web-development, backend, tutorials
- platform: -
- tags: koa2, ebook, course-notes, middleware, async-await, chinese, nodejs, web-server

## Member repositories
- chenshenhai/koa2-note (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:11.426192+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:01:55.326193+00:00, confidence not recorded.
  - readme: https://github.com/chenshenhai/koa2-note (fetched 2026-08-28T04:09:11.426192+00:00, sha 51fba32431c7)
  - homepage: https://chenshenhai.github.io/koa2-note (fetched 2026-08-29T08:56:21.150116+00:00, sha db73f8a07ea7)
- Data as of 2026-08-30T08:39:29.467469+00:00.