CodeSampleX

サンプル

express 5.3.0: Router, json, urlencoded

検証済みサンプル — npm express 5.3.0: Router, json, urlencoded. node 22 · linux debian/x64 · docker で contract を実行し、成功しました: serve optional route parameters via…

sha256:695d4946abdb50d4d2a35390f06f784f24fae9f59aa8c3fa343d2e7955460168

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node linux 24 · ubuntu · glibc 2.39 x64 node javascript npm

検証実行環境

環境 コントラクト ステージ 実行日
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-10-21

ケース

HOW
ゴール
verify pkg:npm/express@5.3.0
パッケージ
シンボル
  • express
  • express.Router
  • express.json
  • express.urlencoded
環境
node
作成日
2026-10-21T01:05:46Z

コントラクト

  1. serve optional route parameters via '/items{/:id}' and parse query strings
  2. parse JSON request bodies with express.json() middleware and respond 201
  3. capture multi-segment paths with named wildcard '/files/*filepath' as a segment array
  4. forward rejected promises from async route handlers to error middleware with HTTP 500

ファイル

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/app.mjs
  • test/contract.mjs

ソースアーティファクトをダウンロード (tar.gz)

ソース

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 pkg:npm/express@5.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express@5.3.0

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:sha256:7ed58e5b3df814a75e8d4ce0a74b48f93a5b7ba35220153e1e811d11b8b09b4b","contract":["serve optional route parameters via '/items{/:id}' and parse query strings","parse JSON request bodies with express.json() middleware and respond 201","capture multi-segment paths with named wildcard '/files/*filepath' as a segment array","forward rejected promises from async route handlers to error middleware with HTTP 500"],"goal":"verify pkg:npm/express@5.3.0","kind":"HOW","packages":["pkg:npm/express@5.3.0"],"schemaVersion":1,"symbols":["express","express.Router","express.json","express.urlencoded"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/express@5.3.0"],"schemaVersion":1,"subject":"pkg:npm/express@5.3.0","symbols":["express","express.Router","express.json","express.urlencoded"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "verify-express",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "express": "5.3.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/express@5.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express@5.3.0"
  ]
}
src/app.mjs
import express from 'express';

export function createApp() {
  const app = express();
  app.use(express.json());
  app.use(express.urlencoded({ extended: false }));

  const router = express.Router();

  router.get('/items{/:id}', (req, res) => {
    res.json({
      id: req.params.id ?? null,
      query: req.query,
    });
  });

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

  router.get('/files/*filepath', (req, res) => {
    res.json({
      segments: req.params.filepath,
    });
  });

  router.get('/async-error', async () => {
    throw new Error('async route failure');
  });

  app.use('/api', router);

  app.use((err, _req, res, _next) => {
    res.status(500).json({
      error: err.message,
    });
  });

  return app;
}
test/contract.mjs
import assert from 'node:assert/strict';
import { createApp } from '../src/app.mjs';

const app = createApp();

const server = await new Promise((resolve, reject) => {
  const srv = app.listen(0, '127.0.0.1', () => resolve(srv));
  srv.once('error', reject);
});

try {
  const { port } = server.address();
  const baseUrl = `http://127.0.0.1:${port}`;

  // 1. Optional route parameter via {/:id} and query string parsing
  const getWithId = await fetch(`${baseUrl}/api/items/42?sort=asc`);
  assert.equal(getWithId.status, 200);
  assert.deepEqual(await getWithId.json(), {
    id: '42',
    query: { sort: 'asc' },
  });

  const getWithoutId = await fetch(`${baseUrl}/api/items`);
  assert.equal(getWithoutId.status, 200);
  assert.deepEqual(await getWithoutId.json(), {
    id: null,
    query: {},
  });

  // 2. JSON body parsing via express.json()
  const postRes = await fetch(`${baseUrl}/api/items`, {
    method: 'POST',
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify({ name: 'widget', count: 3 }),
  });
  assert.equal(postRes.status, 201);
  assert.deepEqual(await postRes.json(), {
    created: true,
    payload: { name: 'widget', count: 3 },
  });

  // 3. Named wildcard parameter (*filepath) returns path segment array in Express 5
  const wildcardRes = await fetch(`${baseUrl}/api/files/docs/guide/intro.md`);
  assert.equal(wildcardRes.status, 200);
  assert.deepEqual(await wildcardRes.json(), {
    segments: ['docs', 'guide', 'intro.md'],
  });

  // 4. Rejected async route handler automatically forwards to Express 5 error middleware
  const errRes = await fetch(`${baseUrl}/api/async-error`);
  assert.equal(errRes.status, 500);
  assert.deepEqual(await errRes.json(), {
    error: 'async route failure',
  });
} finally {
  await new Promise((resolve) => server.close(resolve));
}

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