CodeSampleX

Ejemplo

body-parser 1.20.3: json

Muestra verificada para npm body-parser 1.20.3: json. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó: json parses valid JSON body into…

sha256:397831963716b88813865d4f8c9578dab1a9e91763d36feea32ad40205cc98cb

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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…		 2026-09-19

Caso

HOW
Objetivo
verify json in pkg:npm/body-parser@1.20.3
Paquetes
Símbolos
  • json
Creado
2026-09-18T22:50:31Z

Contrato

  1. json parses valid JSON body into an object
  2. json rejects malformed JSON with 400 status code
  3. json rejects payload exceeding byte limit with 413 status code
  4. json supports custom reviver function
  5. json verify option receives raw buffer
  6. json strict mode rejects primitive JSON values

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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 json 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:
  - json

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:sha256:2e8c09ec587e65648677b2275a423ba1861f7a1683ce175130f30092a80844b1","contract":["json parses valid JSON body into an object","json rejects malformed JSON with 400 status code","json rejects payload exceeding byte limit with 413 status code","json supports custom reviver function","json verify option receives raw buffer","json strict mode rejects primitive JSON values"],"goal":"verify json in pkg:npm/body-parser@1.20.3","kind":"HOW","packages":["pkg:npm/body-parser@1.20.3"],"schemaVersion":1,"symbols":["json"]},"contractCommand":["node","test/contract.mjs"],"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/body-parser@1.20.3"],"schemaVersion":1,"subject":"pkg:npm/body-parser@1.20.3","symbols":["json"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-body-parser-json",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "body-parser": "1.20.3"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify json in pkg:npm/body-parser@1.20.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/body-parser@1.20.3"
  ],
  "symbols": [
    "json"
  ]
}
src/index.mjs
import bodyParser from 'body-parser';

export const json = bodyParser.json;

export function parseJson(options) {
  const middleware = json(options);
  return (req, res = {}) =>
    new Promise((resolve, reject) => {
      middleware(req, res, (err) => {
        if (err) {
          reject(err);
        } else {
          resolve(req.body);
        }
      });
    });
}

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

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

// 1. json parses valid JSON body into an object
{
  const parse = parseJson();
  const req = createRequest(JSON.stringify({ status: 'ok', value: 42 }));
  const result = await parse(req);
  assert.deepStrictEqual(result, { status: 'ok', value: 42 });
  assert.deepStrictEqual(req.body, { status: 'ok', value: 42 });
}

// 2. json rejects malformed JSON with 400 status code
{
  const parse = parseJson();
  const req = createRequest('{"unclosed": "json');
  await assert.rejects(
    async () => {
      await parse(req);
    },
    (err) => {
      assert.strictEqual(err.status, 400);
      assert.strictEqual(err.type, 'entity.parse.failed');
      return true;
    }
  );
}

// 3. json rejects payload exceeding byte limit with 413 status code
{
  const parse = parseJson({ limit: 16 });
  const req = createRequest(JSON.stringify({ message: 'payload that definitely exceeds sixteen bytes' }));
  await assert.rejects(
    async () => {
      await parse(req);
    },
    (err) => {
      assert.strictEqual(err.status, 413);
      assert.strictEqual(err.type, 'entity.too.large');
      return true;
    }
  );
}

// 4. json supports custom reviver function
{
  const parse = parseJson({
    reviver: (key, val) => (typeof val === 'number' ? val * 2 : val)
  });
  const req = createRequest(JSON.stringify({ count: 21 }));
  const result = await parse(req);
  assert.strictEqual(result.count, 42);
}

// 5. json verify option receives raw buffer
{
  let capturedBuf = null;
  const parse = parseJson({
    verify: (req, res, buf) => {
      capturedBuf = buf;
    }
  });
  const rawPayload = JSON.stringify({ verified: true });
  const req = createRequest(rawPayload);
  const result = await parse(req);
  assert.deepStrictEqual(result, { verified: true });
  assert(Buffer.isBuffer(capturedBuf));
  assert.strictEqual(capturedBuf.toString('utf8'), rawPayload);
}

// 6. json strict mode rejects primitive JSON values
{
  const parse = parseJson({ strict: true });
  const req = createRequest('"just a string"');
  await assert.rejects(
    async () => {
      await parse(req);
    },
    (err) => {
      assert.strictEqual(err.status, 400);
      assert.strictEqual(err.type, 'entity.parse.failed');
      return true;
    }
  );
}

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

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