diff --git a/frameworks/koa/Dockerfile b/frameworks/koa/Dockerfile
new file mode 100644
index 0000000..aed2515
--- /dev/null
+++ b/frameworks/koa/Dockerfile
@@ -0,0 +1,9 @@
+FROM node:22-slim
+RUN apt-get update && apt-get install -y --no-install-recommends python3 make g++ && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY package.json .
+RUN npm install --omit=dev
+COPY server.js .
+ENV NODE_ENV=production
+EXPOSE 8080
+CMD ["node", "server.js"]
diff --git a/frameworks/koa/README.md b/frameworks/koa/README.md
new file mode 100644
index 0000000..ee4a2c6
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+++ b/frameworks/koa/README.md
@@ -0,0 +1,17 @@
+# Koa
+
+[Koa](https://github.com/koajs/koa) (~36k ⭐) is an expressive middleware framework for Node.js, designed by the team behind Express to leverage async/await for cleaner control flow.
+
+## Key Features
+- Cascading async/await middleware (no callback hell)
+- Lightweight core (~600 LOC, no bundled middleware)
+- Context object (`ctx`) encapsulates request/response
+- Built by TJ Holowaychick and the Express team
+
+## Implementation Details
+- Koa 2.x with koa-router
+- Cluster mode (one worker per CPU core)
+- Pre-computed JSON and gzip buffers
+- Raw stream body reading (no body-parser)
+- better-sqlite3 with mmap for `/db`
+- HTTP/2 via native `http2` module
diff --git a/frameworks/koa/meta.json b/frameworks/koa/meta.json
new file mode 100644
index 0000000..b1d1ea2
--- /dev/null
+++ b/frameworks/koa/meta.json
@@ -0,0 +1,21 @@
+{
+  "display_name": "Koa",
+  "language": "JS",
+  "type": "framework",
+  "engine": "V8",
+  "description": "Expressive middleware framework for Node.js by the Express team, using async/await.",
+  "repo": "https://github.com/koajs/koa",
+  "enabled": true,
+  "tests": [
+    "baseline",
+    "pipelined",
+    "limited-conn",
+    "json",
+    "upload",
+    "compression",
+    "mixed",
+    "noisy",
+    "baseline-h2",
+    "static-h2"
+  ]
+}
diff --git a/frameworks/koa/package.json b/frameworks/koa/package.json
new file mode 100644
index 0000000..58fc4d0
--- /dev/null
+++ b/frameworks/koa/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "httparena-koa",
+  "version": "1.0.0",
+  "private": true,
+  "dependencies": {
+    "koa": "^2.15.0",
+    "koa-router": "^13.0.0",
+    "better-sqlite3": "^11.0.0"
+  }
+}
diff --git a/frameworks/koa/server.js b/frameworks/koa/server.js
new file mode 100644
index 0000000..adb3f2a
--- /dev/null
+++ b/frameworks/koa/server.js
@@ -0,0 +1,255 @@
+const cluster = require('cluster');
+const os = require('os');
+const fs = require('fs');
+const http2 = require('http2');
+const zlib = require('zlib');
+
+const SERVER_NAME = 'koa';
+
+let datasetItems;
+let largeJsonBuf;
+let largeJsonGzip;
+let jsonBuf;
+let dbStmt;
+const staticFiles = {};
+const MIME_TYPES = {
+    '.css': 'text/css', '.js': 'application/javascript', '.html': 'text/html',
+    '.woff2': 'font/woff2', '.svg': 'image/svg+xml', '.webp': 'image/webp', '.json': 'application/json'
+};
+
+function loadStaticFiles() {
+    const dir = '/data/static';
+    try {
+        for (const name of fs.readdirSync(dir)) {
+            const buf = fs.readFileSync(dir + '/' + name);
+            const ext = name.slice(name.lastIndexOf('.'));
+            staticFiles[name] = { buf, ct: MIME_TYPES[ext] || 'application/octet-stream' };
+        }
+    } catch (e) {}
+}
+
+function loadDataset() {
+    const path = process.env.DATASET_PATH || '/data/dataset.json';
+    try {
+        datasetItems = JSON.parse(fs.readFileSync(path, 'utf8'));
+        const items = datasetItems.map(d => ({
+            id: d.id, name: d.name, category: d.category,
+            price: d.price, quantity: d.quantity, active: d.active,
+            tags: d.tags, rating: d.rating,
+            total: Math.round(d.price * d.quantity * 100) / 100
+        }));
+        jsonBuf = Buffer.from(JSON.stringify({ items, count: items.length }));
+    } catch (e) {}
+}
+
+function loadLargeDataset() {
+    try {
+        const raw = JSON.parse(fs.readFileSync('/data/dataset-large.json', 'utf8'));
+        const items = raw.map(d => ({
+            id: d.id, name: d.name, category: d.category,
+            price: d.price, quantity: d.quantity, active: d.active,
+            tags: d.tags, rating: d.rating,
+            total: Math.round(d.price * d.quantity * 100) / 100
+        }));
+        largeJsonBuf = Buffer.from(JSON.stringify({ items, count: items.length }));
+        largeJsonGzip = zlib.gzipSync(largeJsonBuf, { level: 1 });
+    } catch (e) {}
+}
+
+function loadDatabase() {
+    try {
+        const Database = require('better-sqlite3');
+        const db = new Database('/data/benchmark.db', { readonly: true });
+        db.pragma('mmap_size=268435456');
+        dbStmt = db.prepare('SELECT id, name, category, price, quantity, active, tags, rating_score, rating_count FROM items WHERE price BETWEEN ? AND ? LIMIT 50');
+    } catch (e) {}
+}
+
+function sumQuery(query) {
+    let sum = 0;
+    if (query) {
+        for (const key of Object.keys(query)) {
+            const n = parseInt(query[key], 10);
+            if (n === n) sum += n;
+        }
+    }
+    return sum;
+}
+
+function readBody(ctx) {
+    return new Promise((resolve, reject) => {
+        const chunks = [];
+        ctx.req.on('data', c => chunks.push(c));
+        ctx.req.on('end', () => resolve(Buffer.concat(chunks)));
+        ctx.req.on('error', reject);
+    });
+}
+
+function startWorker() {
+    loadDataset();
+    loadLargeDataset();
+    loadStaticFiles();
+    loadDatabase();
+
+    const Koa = require('koa');
+    const Router = require('koa-router');
+
+    const app = new Koa();
+    app.proxy = false;
+
+    const router = new Router();
+
+    // --- /pipeline ---
+    router.get('/pipeline', (ctx) => {
+        ctx.set('server', SERVER_NAME);
+        ctx.type = 'text/plain';
+        ctx.body = 'ok';
+    });
+
+    // --- /baseline11 GET & POST ---
+    router.get('/baseline11', (ctx) => {
+        const s = sumQuery(ctx.query);
+        ctx.set('server', SERVER_NAME);
+        ctx.type = 'text/plain';
+        ctx.body = String(s);
+    });
+
+    router.post('/baseline11', async (ctx) => {
+        const querySum = sumQuery(ctx.query);
+        const body = (await readBody(ctx)).toString();
+        let total = querySum;
+        const n = parseInt(body.trim(), 10);
+        if (n === n) total += n;
+        ctx.set('server', SERVER_NAME);
+        ctx.type = 'text/plain';
+        ctx.body = String(total);
+    });
+
+    // --- /baseline2 ---
+    router.get('/baseline2', (ctx) => {
+        const s = sumQuery(ctx.query);
+        ctx.set('server', SERVER_NAME);
+        ctx.type = 'text/plain';
+        ctx.body = String(s);
+    });
+
+    // --- /json ---
+    router.get('/json', (ctx) => {
+        if (!jsonBuf) {
+            ctx.status = 500;
+            ctx.body = 'No dataset';
+            return;
+        }
+        ctx.set('server', SERVER_NAME);
+        ctx.set('content-length', String(jsonBuf.length));
+        ctx.type = 'application/json';
+        ctx.body = jsonBuf;
+    });
+
+    // --- /compression ---
+    router.get('/compression', (ctx) => {
+        if (!largeJsonGzip) {
+            ctx.status = 500;
+            ctx.body = 'No dataset';
+            return;
+        }
+        ctx.set('server', SERVER_NAME);
+        ctx.set('content-encoding', 'gzip');
+        ctx.set('content-length', String(largeJsonGzip.length));
+        ctx.type = 'application/json';
+        ctx.body = largeJsonGzip;
+    });
+
+    // --- /db ---
+    router.get('/db', (ctx) => {
+        if (!dbStmt) {
+            ctx.set('server', SERVER_NAME);
+            ctx.type = 'application/json';
+            ctx.body = '{"items":[],"count":0}';
+            return;
+        }
+        let min = 10, max = 50;
+        if (ctx.query.min) min = parseFloat(ctx.query.min) || 10;
+        if (ctx.query.max) max = parseFloat(ctx.query.max) || 50;
+        const rows = dbStmt.all(min, max);
+        const items = rows.map(r => ({
+            id: r.id, name: r.name, category: r.category,
+            price: r.price, quantity: r.quantity, active: r.active === 1,
+            tags: JSON.parse(r.tags),
+            rating: { score: r.rating_score, count: r.rating_count }
+        }));
+        const body = JSON.stringify({ items, count: items.length });
+        ctx.set('server', SERVER_NAME);
+        ctx.set('content-length', String(Buffer.byteLength(body)));
+        ctx.type = 'application/json';
+        ctx.body = body;
+    });
+
+    // --- /upload ---
+    router.post('/upload', async (ctx) => {
+        const body = await readBody(ctx);
+        ctx.set('server', SERVER_NAME);
+        ctx.type = 'text/plain';
+        ctx.body = String(body.length);
+    });
+
+    app.use(router.routes());
+    app.use(router.allowedMethods());
+
+    app.listen(8080, '0.0.0.0', () => {
+        startH2();
+    });
+}
+
+function startH2() {
+    const certFile = process.env.TLS_CERT || '/certs/server.crt';
+    const keyFile = process.env.TLS_KEY || '/certs/server.key';
+    try {
+        const opts = {
+            cert: fs.readFileSync(certFile),
+            key: fs.readFileSync(keyFile),
+            allowHTTP1: false,
+        };
+        const h2server = http2.createSecureServer(opts, (req, res) => {
+            const url = req.url;
+            const q = url.indexOf('?');
+            const p = q === -1 ? url : url.slice(0, q);
+            if (p.startsWith('/static/')) {
+                const name = p.slice(8);
+                const sf = staticFiles[name];
+                if (sf) {
+                    res.writeHead(200, { 'content-type': sf.ct, 'content-length': sf.buf.length, 'server': SERVER_NAME });
+                    res.end(sf.buf);
+                } else {
+                    res.writeHead(404);
+                    res.end();
+                }
+            } else {
+                let sum = 0;
+                if (q !== -1) {
+                    const qs = url.slice(q + 1);
+                    let i = 0;
+                    while (i < qs.length) {
+                        const eq = qs.indexOf('=', i);
+                        if (eq === -1) break;
+                        let amp = qs.indexOf('&', eq);
+                        if (amp === -1) amp = qs.length;
+                        const n = parseInt(qs.slice(eq + 1, amp), 10);
+                        if (n === n) sum += n;
+                        i = amp + 1;
+                    }
+                }
+                res.writeHead(200, { 'content-type': 'text/plain', 'server': SERVER_NAME });
+                res.end(String(sum));
+            }
+        });
+        h2server.listen(8443);
+    } catch (e) {}
+}
+
+if (cluster.isPrimary) {
+    const numCPUs = os.availableParallelism ? os.availableParallelism() : os.cpus().length;
+    for (let i = 0; i < numCPUs; i++) cluster.fork();
+} else {
+    startWorker();
+}