CodeSampleX

Exemplo

body-parser 1.20.3: urlencoded

Amostra verificada para npm body-parser 1.20.3: urlencoded. O contrato rodou em node 22 · linux debian/x64 · docker e passou: bodyParser.urlencoded parses…

sha256:f8f4a93fe91ec2813ab704e0478546c32d8035576e715bb089e5b132cfbe32d1

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
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…		 2026-09-20

Caso

HOW
Objetivo
verify body-parser.urlencoded in pkg:npm/body-parser@1.20.3
Pacotes
Símbolos
  • body-parser.urlencoded
Criado
2026-09-20T21:40:22Z

Contrato

  1. bodyParser.urlencoded parses basic key-value pairs with extended false
  2. bodyParser.urlencoded with extended true parses nested object structures
  3. bodyParser.urlencoded rejects body exceeding limit with 413
  4. bodyParser.urlencoded rejects body exceeding parameterLimit with 413
  5. bodyParser.urlencoded verify option receives raw Buffer
  6. bodyParser.urlencoded ignores non-matching Content-Type and leaves body empty object

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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 body-parser.urlencoded in pkg:npm/body-parser@1.20.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/body-parser@1.20.3
Demonstrate these symbols/APIs:
  - body-parser.urlencoded

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-body-parser-urlencoded",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "body-parser": "1.20.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify body-parser.urlencoded in pkg:npm/body-parser@1.20.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/body-parser@1.20.3"
  ],
  "symbols": [
    "body-parser.urlencoded"
  ]
}
src/index.mjs
import bodyParser from 'body-parser';

export const urlencoded = bodyParser.urlencoded;
export { bodyParser };

/**
 * Execute body-parser urlencoded middleware against a request stream.
 * @param {Function} middleware - Middleware returned by bodyParser.urlencoded()
 * @param {object} req - Request stream or mock request
 * @param {object} [res={}] - Response object
 * @returns {Promise<any>} Resolves with req.body
 */
export function runMiddleware(middleware, req, res = {}) {
  return new Promise((resolve, reject) => {
    middleware(req, res, (err) => {
      if (err) {
        return reject(err);
      }
      resolve(req.body);
    });
  });
}

export default urlencoded;
test/contract.mjs
import assert from 'node:assert';
import { Readable } from 'node:stream';
import { urlencoded, runMiddleware } from '../src/index.mjs';

function createMockReq(bodyContent, contentType = 'application/x-www-form-urlencoded') {
  const req = new Readable({
    read() {
      if (bodyContent !== undefined && bodyContent !== null) {
        this.push(bodyContent);
      }
      this.push(null);
    }
  });
  const length = bodyContent ? Buffer.byteLength(bodyContent) : 0;
  req.headers = {
    'content-type': contentType,
    'content-length': length.toString()
  };
  return req;
}

// 1. bodyParser.urlencoded parses basic key-value pairs with extended false
{
  const parser = urlencoded({ extended: false });
  const req = createMockReq('user=alice&status=active');
  const body = await runMiddleware(parser, req);
  assert.strictEqual(body.user, 'alice');
  assert.strictEqual(body.status, 'active');
  assert.strictEqual(Object.keys(body).length, 2);
  assert.strictEqual(req.body.user, 'alice');
}

// 2. bodyParser.urlencoded with extended true parses nested object structures
{
  const parser = urlencoded({ extended: true });
  const req = createMockReq('profile%5Bname%5D=bob&profile%5Brole%5D=developer');
  const body = await runMiddleware(parser, req);
  assert.strictEqual(body.profile.name, 'bob');
  assert.strictEqual(body.profile.role, 'developer');
  assert.strictEqual(Object.keys(body.profile).length, 2);
  assert.strictEqual(req.body.profile.name, 'bob');
}

// 3. bodyParser.urlencoded rejects body exceeding limit with 413
{
  const parser = urlencoded({ extended: false, limit: 10 });
  const req = createMockReq('key=value_exceeding_ten_bytes');
  await assert.rejects(
    async () => {
      await runMiddleware(parser, req);
    },
    (err) => {
      assert.strictEqual(err.status, 413);
      assert.strictEqual(err.type, 'entity.too.large');
      return true;
    }
  );
}

// 4. bodyParser.urlencoded rejects body exceeding parameterLimit with 413
{
  const parser = urlencoded({ extended: false, parameterLimit: 2 });
  const req = createMockReq('a=1&b=2&c=3');
  await assert.rejects(
    async () => {
      await runMiddleware(parser, req);
    },
    (err) => {
      assert.strictEqual(err.status, 413);
      assert.strictEqual(err.type, 'parameters.too.many');
      return true;
    }
  );
}

// 5. bodyParser.urlencoded verify option receives raw Buffer
{
  let capturedBuf = null;
  let capturedEncoding = null;
  const parser = urlencoded({
    extended: false,
    verify: (req, res, buf, encoding) => {
      capturedBuf = buf;
      capturedEncoding = encoding;
    }
  });
  const rawPayload = 'user=charlie&role=tester';
  const req = createMockReq(rawPayload);
  const body = await runMiddleware(parser, req);
  assert.strictEqual(body.user, 'charlie');
  assert.strictEqual(body.role, 'tester');
  assert(Buffer.isBuffer(capturedBuf));
  assert.strictEqual(capturedBuf.toString('utf8'), rawPayload);
  assert.strictEqual(capturedEncoding, 'utf-8');
}

// 6. bodyParser.urlencoded ignores non-matching Content-Type and leaves body empty object
{
  const parser = urlencoded({ extended: false });
  const req = createMockReq('{"not":"urlencoded"}', 'application/json');
  const body = await runMiddleware(parser, req);
  assert.deepStrictEqual(body, {});
  assert.deepStrictEqual(req.body, {});
}

console.log('Contract tests passed successfully.');

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