Repo brief: koajs/koa

Generated by RepoPilot · document generated 2026-09-15 · concise human review Evidence snapshot · analyzed 2026-09-15T08:31:19.432Z · commit e145325bec73

Verdict

Healthy — Healthy across all four use cases

• Last commit 1w ago
• 25+ active contributors
• Distributed ownership (top contributor 29% of recent commits)
• MIT licensed
• 2 more receipts on the live page

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

Koa is a minimal, expressive HTTP middleware framework for Node.js (v18+) that uses ES2017 async/await to handle request/response chains. It provides only ~570 lines of core functionality including content negotiation, cookie handling, and error management, delegating all other features to composable middleware rather than bundling them in the framework itself. Single-package structure: core logic in lib/ (application.js, context.js, request.js, response.js) with test suites mirroring this structure in __tests__/ directories. Test helpers in test-helpers/ provide utilities for mocking HTTP contexts. ESM build output goes to dist/koa.mjs (generated via gen-esm-wrapper),…

Start here

Open these first:

• lib/application.js — Entry point and core Koa application class that orchestrates middleware composition, request handling, and error management.
• lib/context.js — Context object that wraps request and response, providing the unified API that middleware receives and manipulates.
• lib/request.js — Request abstraction layer delegating to Node's IncomingMessage with content negotiation, header parsing, and query handling.
• lib/response.js — Response abstraction layer wrapping Node's ServerResponse with status, header, body, and redirect management.
• package.json — Declares dual CJS/ESM exports via ./lib/application.js and ./dist/koa.mjs, build scripts, and Node v18+ requirement.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/koajs/koa.git
cd koa
npm install
npm test

Daily commands:

This is a library framework, not a runnable application. To use Koa: create a file like app.js with const Koa = require('koa'); const app = new Koa(); app.use(ctx => { ctx.body = 'Hello'; }); app.listen(3000); then…

…shortened for this brief.

Key cautions & unknowns

• Node 18.0.0 minimum is enforced (no backport to older LTS versions like v16). The framework has no built-in routing, templating, static file serving, or authentication—all must be provided by external middleware; don't…
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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