CodeSampleX

示例

express 5.1.0: Router

已验证示例 — npm express 5.1.0: Router. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： express.Router() creates modular route handlers for HTTP methods

sha256:aed33eea9243e1aa212673df2ae41a13c6ce62d36a115511c87bda23e0318f72

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 linux 24 · ubuntu · glibc 2.39 x64 npm

验证运行环境

环境 契约 阶段 运行日期
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

案例

HOW
目标
verify express.Router in pkg:npm/express@5.1.0
包
符号
  • express.Router
创建时间
2026-08-23T04:25:50Z

契约

  1. express.Router() creates modular route handlers for HTTP methods
  2. router.use() applies router-level middleware to scoped sub-paths
  3. router.route() chains multiple HTTP method handlers on a single route path
  4. router.param() intercepts and processes URL path parameters
  5. express.Router({ mergeParams: true }) propagates parent route parameters to nested routers
  6. express.Router({ caseSensitive: true }) enforces strict case sensitivity on routes
  7. express.Router in Express 5 catches async handler exceptions and propagates to error middleware

文件

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.js

下载源代码构件 (tar.gz)

源代码

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify express.Router in pkg:npm/express@5.1.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express@5.1.0
Demonstrate these symbols/APIs:
  - express.Router

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:55d2f7e79aa1f9c39f7dd2e85c403374392b5e21e8034077ae8de36a71da2524","contract":["express.Router() creates modular route handlers for HTTP methods","router.use() applies router-level middleware to scoped sub-paths","router.route() chains multiple HTTP method handlers on a single route path","router.param() intercepts and processes URL path parameters","express.Router({ mergeParams: true }) propagates parent route parameters to nested routers","express.Router({ caseSensitive: true }) enforces strict case sensitivity on routes","express.Router in Express 5 catches async handler exceptions and propagates to error middleware"],"goal":"verify express.Router in pkg:npm/express@5.1.0","kind":"HOW","packages":["pkg:npm/express@5.1.0"],"schemaVersion":1,"symbols":["express.Router"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/express@5.1.0"],"schemaVersion":1,"subject":"pkg:npm/express@5.1.0","symbols":["express.Router"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "private": true,
  "description": "Clean-room verification for express.Router in express@5.1.0",
  "main": "test/contract.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "express": "5.1.0"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify express.Router in pkg:npm/express@5.1.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express@5.1.0"
  ],
  "symbols": [
    "express.Router"
  ]
}
test/contract.js
const assert = require('assert');
const http = require('http');
const express = require('express');

async function main() {
  const app = express();
  app.use(express.json());

  // 1. Standard Router with router-level middleware and HTTP methods
  const apiRouter = express.Router();
  let middlewareLogged = false;

  apiRouter.use((req, res, next) => {
    middlewareLogged = true;
    res.setHeader('X-Router-Middleware', 'applied');
    next();
  });

  apiRouter.get('/items', (req, res) => {
    res.json({ items: ['item1', 'item2'] });
  });

  apiRouter.post('/items', (req, res) => {
    res.status(201).json({ created: req.body });
  });

  // 2. router.route() method chaining
  apiRouter.route('/resource')
    .get((req, res) => {
      res.json({ method: 'GET', resource: 'active' });
    })
    .put((req, res) => {
      res.json({ method: 'PUT', updated: req.body });
    });

  // 3. router.param() parameter handling middleware
  apiRouter.param('itemId', (req, res, next, id) => {
    req.itemData = { id: id, normalizedId: Number(id) };
    next();
  });

  apiRouter.get('/items/:itemId', (req, res) => {
    res.json({ item: req.itemData });
  });

  // 4. Nested Router with mergeParams: true
  const parentRouter = express.Router();
  const childRouter = express.Router({ mergeParams: true });

  childRouter.get('/comments/:commentId', (req, res) => {
    res.json({
      articleId: req.params.articleId,
      commentId: req.params.commentId
    });
  });

  parentRouter.use('/articles/:articleId', childRouter);

  // 5. Case-sensitive router
  const caseRouter = express.Router({ caseSensitive: true });
  caseRouter.get('/ExactCase', (req, res) => {
    res.json({ matched: true });
  });

  // 6. Express 5 async error handling in Router
  const asyncRouter = express.Router();
  asyncRouter.get('/async-pass', async (req, res) => {
    const data = await Promise.resolve('async-data');
    res.json({ result: data });
  });

  asyncRouter.get('/async-fail', async (req, res) => {
    throw new Error('Async router failure in Express 5');
  });

  // Mount routers to app
  app.use('/api', apiRouter);
  app.use('/blog', parentRouter);
  app.use('/case', caseRouter);
  app.use('/async', asyncRouter);

  // 4-argument Express error middleware
  app.use((err, req, res, next) => {
    res.status(500).json({ error: true, message: err.message });
  });

  // Start HTTP server on dynamic port
  const server = http.createServer(app);
  await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
  const port = server.address().port;
  const baseUrl = `http://127.0.0.1:${port}`;

  async function request(path, options = {}) {
    const url = new URL(path, baseUrl);
    const headers = options.headers || {};
    let body = options.body;

    if (body && typeof body === 'object' && !Buffer.isBuffer(body)) {
      body = JSON.stringify(body);
      headers['Content-Type'] = 'application/json';
    }

    return new Promise((resolve, reject) => {
      const req = http.request(url, {
        method: options.method || 'GET',
        headers: headers,
        agent: false
      }, (res) => {
        let raw = '';
        res.on('data', chunk => { raw += chunk; });
        res.on('end', () => {
          let parsedJson = null;
          try {
            parsedJson = JSON.parse(raw);
          } catch (_) {}
          resolve({
            status: res.statusCode,
            headers: res.headers,
            text: raw,
            json: parsedJson
          });
        });
      });
      req.on('error', reject);
      if (body) {
        req.write(body);
      }
      req.end();
    });
  }

  try {
    // Assert 1: express.Router() modular route handlers & router.use() middleware
    const resGet = await request('/api/items');
    assert.strictEqual(resGet.status, 200, 'GET /api/items should return 200');
    assert.deepStrictEqual(resGet.json, { items: ['item1', 'item2'] });
    assert.strictEqual(resGet.headers['x-router-middleware'], 'applied');
    assert.strictEqual(middlewareLogged, true, 'Router middleware should have executed');

    const resPost = await request('/api/items', {
      method: 'POST',
      body: { name: 'widget' }
    });
    assert.strictEqual(resPost.status, 201, 'POST /api/items should return 201');
    assert.deepStrictEqual(resPost.json.created, { name: 'widget' });

    // Assert 2: router.route() chained methods
    const resRouteGet = await request('/api/resource');
    assert.strictEqual(resRouteGet.status, 200);
    assert.deepStrictEqual(resRouteGet.json, { method: 'GET', resource: 'active' });

    const resRoutePut = await request('/api/resource', {
      method: 'PUT',
      body: { updated: true }
    });
    assert.strictEqual(resRoutePut.status, 200);
    assert.deepStrictEqual(resRoutePut.json, { method: 'PUT', updated: { updated: true } });

    // Assert 3: router.param()
    const resParam = await request('/api/items/456');
    assert.strictEqual(resParam.status, 200);
    assert.deepStrictEqual(resParam.json.item, { id: '456', normalizedId: 456 });

    // Assert 4: mergeParams: true across nested routers
    const resNested = await request('/blog/articles/tech-trends/comments/c99');
    assert.strictEqual(resNested.status, 200);
    assert.strictEqual(resNested.json.articleId, 'tech-trends');
    assert.strictEqual(resNested.json.commentId, 'c99');

    // Assert 5: caseSensitive router
    const resCaseMatch = await request('/case/ExactCase');
    assert.strictEqual(resCaseMatch.status, 200);
    assert.strictEqual(resCaseMatch.json.matched, true);

    const resCaseMismatch = await request('/case/exactcase');
    assert.strictEqual(resCaseMismatch.status, 404, 'Case mismatch on caseSensitive router should 404');

    // Assert 6: Async handlers and error propagation in router
    const resAsyncOk = await request('/async/async-pass');
    assert.strictEqual(resAsyncOk.status, 200);
    assert.strictEqual(resAsyncOk.json.result, 'async-data');

    const resAsyncErr = await request('/async/async-fail');
    assert.strictEqual(resAsyncErr.status, 500);
    assert.strictEqual(resAsyncErr.json.error, true);
    assert.strictEqual(resAsyncErr.json.message, 'Async router failure in Express 5');

    console.log('All express.Router contract assertions passed successfully.');
  } finally {
    await new Promise((resolve) => server.close(resolve));
  }
}

main().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

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