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Koa Middleware

⬢ 層級 1技術
中等
薪資影響
1 個月
學習時長
容易
難度
8
職業
一覽

Koa is a minimal Node.js web framework (Express alternative) built by Express team. Lightweight, middleware-first, async/await native (no callbacks). Mastery takes 2-3 weeks. Practitioners earn 10-20% premium because they ship APIs 30% faster than Express (cleaner middleware). The 5% who design advanced middleware chains (auth, logging, rate-limit, compression) are valuable.

什麼是 Koa Middleware

Koa is a lightweight web framework for Node.js, created by the Express team. It's minimal (provides only essentials), middleware-first, and built on async/await (not callbacks). A Koa app is a composition of middleware functions, each middleware has access to a context object (request + response) and can execute code before/after downstream middleware. Koa provides routing (via koa-router), body parsing, static file serving, and a clean API for building REST APIs and web servers.

🔧 工具與生態
Koa frameworkNode.jsAsync/awaitMiddlewareRouting (koa-router)Body parsingContext object

📋 開始之前

Nodejs Express

💰 各地區薪資

地區初級中級高級
USA$75,000$120,000$180,000
UK£48,000£75,000£115,000
EU€52,000€82,000€125,000
CANADACA$75,000CA$125,000CA$185,000

⚖ 對比

Nodejs Express

❓ 常見問題

Why use Koa instead of Express?
Express uses callbacks (callback hell), Koa uses async/await (cleaner). Express middleware = (req, res, next), Koa middleware = (ctx, next) with context object (cleaner API). Koa is lighter (20KB vs Express 50KB). Both are fast enough; Koa is more modern.
How does Koa middleware work?
Middleware is an async function: `async (ctx, next) => { ... }`. Execute code before request (downstream), call `await next()` to pass to next middleware, execute code after response (upstream, useful for timing, logging).
What is ctx (context)?
Koa context object contains request (headers, body, params) and response (status, body, headers). Much cleaner than Express (req, res separate). Middleware accesses ctx.request, ctx.response, sets ctx.status, ctx.body.
Can Koa handle large files?
Yes. Use streaming (ctx.body = stream). Don't load entire file in memory. Koa middleware can pipe streams.

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