CodeSampleX

サンプル

body-parser 1.20.3: json

検証済みサンプル — npm body-parser 1.20.3: json. node 22 · linux debian/x64 · docker で contract を実行し、成功しました: json parses valid JSON body into an object

sha256:397831963716b88813865d4f8c9578dab1a9e91763d36feea32ad40205cc98cb

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 linux 24 · ubuntu · glibc 2.39 x64 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…		 2026-09-19

ケース

HOW
ゴール
verify json in pkg:npm/body-parser@1.20.3
パッケージ
シンボル
  • json
作成日
2026-09-18T22:50:31Z

コントラクト

  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

ファイル

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