CodeSampleX

Sample

body-parser 2.3.0

Verified sample for npm body-parser 2.3.0. The contract ran on node 22 · linux alpine/x64 · docker and passed: bodyParser.json() parses JSON request bodies…

sha256:44d74dc79dc3563070cf3bbdeace6c1dc4ac9a865dfb7e0d68021dcf7dbfe6c7

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
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

Case

HOW
Goal
verify pkg:npm/body-parser@2.3.0
Packages
Environment
node 22.23.2
Created
2026-08-20T13:31:26Z

Contract

  1. bodyParser.json() parses JSON request bodies and populates req.body with parsed object
  2. bodyParser.urlencoded({ extended: false }) parses URL-encoded bodies into key-value pairs
  3. bodyParser.text() parses plain text request bodies into string
  4. bodyParser.raw() parses request bodies into Buffer when matching application/octet-stream
  5. bodyParser.json() invokes next with 400 status error on malformed JSON payload
  6. body-parser middlewares pass through without modifying req.body when Content-Type does not match

Files

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

Download the source artifact (tar.gz)

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/body-parser@2.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/body-parser@2.3.0
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:b95c6dd3635764e01b315461da6cd19bb2230fd2dba5db6f7276667ca4dff9fc","constraints":{"executionContext":"node"},"contract":["bodyParser.json() parses JSON request bodies and populates req.body with parsed object","bodyParser.urlencoded({ extended: false }) parses URL-encoded bodies into key-value pairs","bodyParser.text() parses plain text request bodies into string","bodyParser.raw() parses request bodies into Buffer when matching application/octet-stream","bodyParser.json() invokes next with 400 status error on malformed JSON payload","body-parser middlewares pass through without modifying req.body when Content-Type does not match"],"goal":"verify pkg:npm/body-parser@2.3.0","kind":"HOW","packages":["pkg:npm/body-parser@2.3.0"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/body-parser@2.3.0"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "csx-sample-body-parser",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification for body-parser",
  "main": "test/contract.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "body-parser": "2.3.0"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/body-parser@2.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/body-parser@2.3.0"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.js
const assert = require('assert');
const http = require('http');
const bodyParser = require('body-parser');

async function runTests() {
  // Set up an HTTP server with endpoints exercising each body-parser middleware
  const server = http.createServer((req, res) => {
    if (req.url === '/json') {
      bodyParser.json()(req, res, (err) => {
        if (err) {
          res.statusCode = err.status || err.statusCode || 500;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({ error: err.message }));
          return;
        }
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ body: req.body }));
      });
    } else if (req.url === '/urlencoded') {
      bodyParser.urlencoded({ extended: false })(req, res, (err) => {
        if (err) {
          res.statusCode = err.status || err.statusCode || 500;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({ error: err.message }));
          return;
        }
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ body: req.body }));
      });
    } else if (req.url === '/text') {
      bodyParser.text()(req, res, (err) => {
        if (err) {
          res.statusCode = err.status || err.statusCode || 500;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({ error: err.message }));
          return;
        }
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ body: req.body }));
      });
    } else if (req.url === '/raw') {
      bodyParser.raw()(req, res, (err) => {
        if (err) {
          res.statusCode = err.status || err.statusCode || 500;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({ error: err.message }));
          return;
        }
        const isBuf = Buffer.isBuffer(req.body);
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ isBuffer: isBuf, hex: isBuf ? req.body.toString('hex') : null, length: isBuf ? req.body.length : null }));
      });
    } else if (req.url === '/passthrough') {
      bodyParser.json()(req, res, (err) => {
        if (err) {
          res.statusCode = err.status || err.statusCode || 500;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({ error: err.message }));
          return;
        }
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ body: req.body === undefined ? '__undefined__' : req.body }));
      });
    } else {
      res.statusCode = 404;
      res.end();
    }
  });

  await new Promise((resolve) => server.listen(0, '127.0.0.1', resolve));
  const port = server.address().port;

  function post(path, contentType, payload) {
    return new Promise((resolve, reject) => {
      const data = Buffer.isBuffer(payload) ? payload : Buffer.from(payload || '', 'utf8');
      const req = http.request({
        hostname: '127.0.0.1',
        port: port,
        path: path,
        method: 'POST',
        headers: {
          'Content-Type': contentType,
          'Content-Length': data.length
        }
      }, (res) => {
        let body = '';
        res.on('data', chunk => body += chunk);
        res.on('end', () => resolve({ status: res.statusCode, data: body }));
      });
      req.on('error', reject);
      req.write(data);
      req.end();
    });
  }

  // 1. JSON parsing
  const jsonRes = await post('/json', 'application/json', JSON.stringify({ name: 'csx', count: 42, flag: true }));
  assert.strictEqual(jsonRes.status, 200, 'JSON POST should succeed with 200 OK');
  assert.deepStrictEqual(JSON.parse(jsonRes.data).body, { name: 'csx', count: 42, flag: true }, 'JSON body should be parsed correctly');

  // 2. URL-encoded parsing
  const urlRes = await post('/urlencoded', 'application/x-www-form-urlencoded', 'key1=val1&key2=val2');
  assert.strictEqual(urlRes.status, 200, 'URL-encoded POST should succeed with 200 OK');
  assert.deepStrictEqual(JSON.parse(urlRes.data).body, { key1: 'val1', key2: 'val2' }, 'URL-encoded body should be parsed into object');

  // 3. Text parsing
  const textRes = await post('/text', 'text/plain', 'plain text payload content');
  assert.strictEqual(textRes.status, 200, 'Text POST should succeed with 200 OK');
  assert.strictEqual(JSON.parse(textRes.data).body, 'plain text payload content', 'Text body should match raw string');

  // 4. Raw Buffer parsing
  const rawRes = await post('/raw', 'application/octet-stream', Buffer.from([0x01, 0x02, 0x03, 0x04]));
  assert.strictEqual(rawRes.status, 200, 'Raw POST should succeed with 200 OK');
  const rawData = JSON.parse(rawRes.data);
  assert.strictEqual(rawData.isBuffer, true, 'Raw body should be a Buffer');
  assert.strictEqual(rawData.hex, '01020304', 'Raw buffer hex should match sent bytes');
  assert.strictEqual(rawData.length, 4, 'Raw buffer length should match sent byte length');

  // 5. Malformed JSON returns 400
  const malformedRes = await post('/json', 'application/json', '{invalid json');
  assert.strictEqual(malformedRes.status, 400, 'Malformed JSON should result in HTTP 400');

  // 6. Ignored Content-Type passes through without modifying req.body
  const passRes = await post('/passthrough', 'text/plain', 'hello world');
  assert.strictEqual(passRes.status, 200, 'Non-matching Content-Type should pass through');
  assert.strictEqual(JSON.parse(passRes.data).body, '__undefined__', 'req.body should remain undefined when Content-Type does not match');

  await new Promise(resolve => server.close(resolve));
  console.log('All body-parser contract assertions passed successfully.');
}

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

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