qs 6.13.0: parse, stringify

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/qs@6.13.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/qs@6.13.0

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.

{"case":{"caseId":"case:sha256:c02d3ee96abda21658f399541f09b53dd7d7a3bc5ee8887edf8b1dd706a32324","contract":["assert qs.parse parses basic query strings and nested objects","assert qs.parse parses bracketed and indexed query string arrays","assert qs.parse supports dot notation with allowDots option","assert qs.stringify serializes nested objects and arrays","assert qs.stringify formats arrays using indices, brackets, and repeat options","assert qs.stringify and qs.parse roundtrip complex nested object structures"],"goal":"verify pkg:npm/qs@6.13.0","kind":"HOW","packages":["pkg:npm/qs@6.13.0"],"schemaVersion":1,"symbols":["qs.parse","qs.stringify"]},"contractCommand":["node","test/contract.mjs"],"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/qs@6.13.0"],"schemaVersion":1,"subject":"pkg:npm/qs@6.13.0","symbols":["qs.parse","qs.stringify"],"verifierAdapter":"node-typescript@1"}

const qs = require('qs');

/**
 * Parses a query string into an object structure.
 *
 * @param {string} str - Query string to parse.
 * @param {Object} [options] - Parsing options.
 * @returns {Object} Parsed query object.
 */
function parseQuery(str, options) {
  return qs.parse(str, options);
}

/**
 * Serializes an object into a query string.
 *
 * @param {Object} obj - Object to serialize.
 * @param {Object} [options] - Stringification options.
 * @returns {string} Serialized query string.
 */
function stringifyQuery(obj, options) {
  return qs.stringify(obj, options);
}

module.exports = {
  parseQuery,
  stringifyQuery,
  qs,
};

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{
  "name": "sample-qs",
  "version": "1.0.0",
  "description": "Clean-room sample verifying pkg:npm/qs@6.13.0 functionality",
  "main": "index.js",
  "license": "MIT-0",
  "dependencies": {
    "qs": "6.13.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/qs@6.13.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/qs@6.13.0"
  ],
  "symbols": [
    "qs.parse",
    "qs.stringify"
  ]
}

import assert from 'node:assert';
import qs from 'qs';
import { parseQuery, stringifyQuery } from '../index.js';

// 1. Basic query strings and nested objects
const parsedBasic = parseQuery('foo=bar&baz=qux');
assert.deepStrictEqual(
  parsedBasic,
  { foo: 'bar', baz: 'qux' },
  'qs.parse must parse simple key-value pairs'
);

const parsedNested = parseQuery('user[name]=alice&user[age]=30');
assert.deepStrictEqual(
  parsedNested,
  { user: { name: 'alice', age: '30' } },
  'qs.parse must parse nested bracketed objects'
);

// 2. Bracketed and indexed arrays
const parsedIndexed = parseQuery('items[0]=apple&items[1]=banana');
assert.deepStrictEqual(
  parsedIndexed,
  { items: ['apple', 'banana'] },
  'qs.parse must parse explicit indexed arrays'
);

const parsedBrackets = parseQuery('items[]=apple&items[]=banana');
assert.deepStrictEqual(
  parsedBrackets,
  { items: ['apple', 'banana'] },
  'qs.parse must parse empty bracket arrays'
);

// 3. Dot notation with allowDots
const parsedDots = parseQuery('user.profile.name=alice&user.active=true', { allowDots: true });
assert.deepStrictEqual(
  parsedDots,
  { user: { profile: { name: 'alice' }, active: 'true' } },
  'qs.parse must support dot notation when allowDots is true'
);

// 4. Stringify nested objects and arrays
const stringifiedNested = stringifyQuery(
  { user: { name: 'alice', role: 'admin' } },
  { encode: false }
);
assert.strictEqual(
  stringifiedNested,
  'user[name]=alice&user[role]=admin',
  'qs.stringify must serialize nested objects'
);

// 5. Array formatting options
const arrObj = { colors: ['red', 'blue'] };

const indicesFormat = stringifyQuery(arrObj, { arrayFormat: 'indices', encode: false });
assert.strictEqual(
  indicesFormat,
  'colors[0]=red&colors[1]=blue',
  'qs.stringify must support indices array format'
);

const bracketsFormat = stringifyQuery(arrObj, { arrayFormat: 'brackets', encode: false });
assert.strictEqual(
  bracketsFormat,
  'colors[]=red&colors[]=blue',
  'qs.stringify must support brackets array format'
);

const repeatFormat = stringifyQuery(arrObj, { arrayFormat: 'repeat', encode: false });
assert.strictEqual(
  repeatFormat,
  'colors=red&colors=blue',
  'qs.stringify must support repeat array format'
);

// 6. Roundtrip complex nested object structures
const complexObj = {
  filter: {
    category: 'electronics',
    tags: ['portable', 'audio']
  },
  page: '1',
  sort: 'price_desc'
};

const encoded = stringifyQuery(complexObj);
const decoded = parseQuery(encoded);
assert.deepStrictEqual(
  decoded,
  complexObj,
  'qs.parse(qs.stringify(obj)) must roundtrip complex nested structures'
);

console.log('All contract assertions passed.');