CodeSampleX

Exemple

express 5.2.1

Échantillon vérifié pour npm express 5.2.1. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi : express() creates an application…

sha256:9ab8b3fc8e0562fee4c6b35848021c4df71d8b332ee57bc250caa38421deb44c

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré linux 24 · ubuntu · glibc 2.39 x64 npm

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-20

Cas

HOW
Objectif
verify pkg:npm/express@5.2.1
Paquets
Créé
2026-08-20T13:48:38Z

Contrat

  1. express() creates an application instance and express.Router() creates modular route handlers
  2. nested router with mergeParams: true inherits and resolves parent path parameters across route hierarchies
  3. res.set() configures custom response headers, res.cookie() sets HttpOnly and SameSite cookie options, and res.status().json() delivers formatted JSON responses
  4. async route handlers returning rejected promises automatically propagate errors to Express error-handling middleware without unhandled rejections

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code source

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@5.2.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express@5.2.1

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
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package-lock.json
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package.json
{
  "name": "sample-express",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification of express",
  "main": "src/index.js",
  "license": "MIT-0",
  "dependencies": {
    "express": "5.2.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/express@5.2.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express@5.2.1"
  ]
}
src/index.js
const express = require('express');

/**
 * Creates and configures an Express application with async error handling,
 * nested router parameter merging, and standard response helpers.
 * @returns {import('express').Express}
 */
function createApp() {
  const app = express();

  // JSON parsing middleware
  app.use(express.json());

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

  childRouter.get('/items/:itemId', (req, res) => {
    res.status(200).json({
      orgId: req.params.orgId,
      itemId: req.params.itemId
    });
  });

  parentRouter.use('/orgs/:orgId', childRouter);
  app.use('/api', parentRouter);

  // Response header and cookie demonstration
  app.get('/api/response-helpers', (req, res) => {
    res.set('X-Custom-Header', 'express-v5');
    res.cookie('auth_token', 'test-token-12345', {
      httpOnly: true,
      sameSite: 'strict',
      path: '/'
    });
    res.status(200).json({ success: true, message: 'Response helpers verified' });
  });

  // Async route handler that throws - testing native Express 5 Promise rejection handling
  app.get('/api/async-error', async (req, res) => {
    throw new Error('Async execution failed');
  });

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

  return app;
}

module.exports = {
  createApp,
  express
};
test/contract.mjs
import assert from 'node:assert';
import http from 'node:http';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);
const { createApp, express } = require('../src/index.js');

// 1. Verify exports and types
assert.strictEqual(typeof express, 'function', 'express must be exported as a function');
assert.strictEqual(typeof express.Router, 'function', 'express.Router must be a function');
assert.strictEqual(typeof createApp, 'function', 'createApp must be a function');

const app = createApp();
assert.ok(app, 'app must be created');
assert.strictEqual(typeof app.listen, 'function', 'app.listen must be a function');

const server = http.createServer(app);

async function runContract() {
  await new Promise((resolve, reject) => {
    server.listen(0, '127.0.0.1', () => {
      resolve();
    });
    server.on('error', reject);
  });

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

  try {
    // 1. Verify nested router with mergeParams: true propagates parent route parameters
    const nestedRes = await fetch(`${baseUrl}/api/orgs/org-42/items/item-99`);
    assert.strictEqual(nestedRes.status, 200, 'Nested router should return 200');
    const nestedData = await nestedRes.json();
    assert.deepStrictEqual(nestedData, { orgId: 'org-42', itemId: 'item-99' }, 'Parent and child params should match');

    // 2. Verify response helpers (res.set, res.cookie, res.status, res.json)
    const helperRes = await fetch(`${baseUrl}/api/response-helpers`);
    assert.strictEqual(helperRes.status, 200, 'Response helpers should return 200');
    assert.strictEqual(helperRes.headers.get('x-custom-header'), 'express-v5', 'Custom header should match');
    const cookieHeader = helperRes.headers.get('set-cookie');
    assert.ok(cookieHeader && cookieHeader.includes('auth_token=test-token-12345'), 'Cookie header should contain auth_token');
    assert.ok(cookieHeader.toLowerCase().includes('httponly'), 'Cookie should be HttpOnly');
    assert.ok(cookieHeader.toLowerCase().includes('samesite=strict'), 'Cookie should have SameSite=Strict');
    const helperData = await helperRes.json();
    assert.deepStrictEqual(helperData, { success: true, message: 'Response helpers verified' });

    // 3. Verify Express 5 native async route handler rejection propagation to error middleware
    const asyncErrRes = await fetch(`${baseUrl}/api/async-error`);
    assert.strictEqual(asyncErrRes.status, 500, 'Async rejected error should be caught by error middleware with 500');
    const asyncErrData = await asyncErrRes.json();
    assert.deepStrictEqual(asyncErrData, { error: true, message: 'Async execution failed' }, 'Error middleware payload should match');

    console.log('Contract tests passed successfully.');
  } finally {
    await new Promise((resolve) => server.close(resolve));
  }
}

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

Seeder d'origine

anonyme