CodeSampleX

Sample

express-rate-limit 8.6.2: MemoryStore

Verified sample for npm express-rate-limit 8.6.2: MemoryStore. The contract ran on node 22 · linux debian/x64 · docker and passed.

sha256:cb8664f79e1586e70c327da550f7c59e76f93741e08795b3cc6de107f34a3607

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 linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
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…		 2026-09-07

Case

HOW
Goal
verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2
Packages
Symbols
  • express-rate-limit.MemoryStore
Created
2026-09-07T03:33:29Z

Contract

  1. MemoryStore initializes with windowMs and sets localKeys flag to true
  2. MemoryStore increment records hits and returns totalHits count and resetTime Date
  3. MemoryStore get retrieves hit count and resetTime for active keys and returns undefined for unknown keys
  4. MemoryStore decrement reduces totalHits without dropping below zero
  5. MemoryStore resetKey clears hit records for a specific key
  6. MemoryStore resetAll clears hit records for all keys
  7. MemoryStore resets totalHits when incremented after windowMs expiration
  8. MemoryStore shutdown stops internal timers and resets all stored keys
  9. MemoryStore integrates seamlessly as the store option for rateLimit middleware

Files

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

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 express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/express-rate-limit@8.6.2
Demonstrate these symbols/APIs:
  - express-rate-limit.MemoryStore

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-express-rate-limit-memorystore",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "express-rate-limit": "8.6.2"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify express-rate-limit.MemoryStore in pkg:npm/express-rate-limit@8.6.2",
  "kind": "HOW",
  "packages": [
    "pkg:npm/express-rate-limit@8.6.2"
  ],
  "symbols": [
    "express-rate-limit.MemoryStore"
  ]
}
src/index.mjs
import { MemoryStore, rateLimit } from 'express-rate-limit';

/**
 * Creates and initializes an express-rate-limit MemoryStore instance.
 * @param {number} [windowMs=60000] - Time window in milliseconds.
 * @returns {MemoryStore} Initialized MemoryStore instance.
 */
export function createMemoryStore(windowMs = 60000) {
  const store = new MemoryStore();
  store.init({ windowMs });
  return store;
}

/**
 * Increments the hit count for a specific key in the store.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<{ totalHits: number, resetTime: Date }>}
 */
export async function recordHit(store, key) {
  return await store.increment(key);
}

/**
 * Retrieves the rate limit info for a key.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<{ totalHits: number, resetTime: Date } | undefined>}
 */
export async function getHitInfo(store, key) {
  return await store.get(key);
}

/**
 * Decrements the hit count for a key.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<void>}
 */
export async function decrementHit(store, key) {
  await store.decrement(key);
}

/**
 * Resets a single key in the store.
 * @param {MemoryStore} store
 * @param {string} key
 * @returns {Promise<void>}
 */
export async function resetKey(store, key) {
  await store.resetKey(key);
}

/**
 * Resets all keys in the store.
 * @param {MemoryStore} store
 * @returns {Promise<void>}
 */
export async function resetAllKeys(store) {
  await store.resetAll();
}

/**
 * Creates an express-rate-limit middleware configured with an explicit MemoryStore.
 * @param {Object} options
 * @param {number} [options.windowMs=60000]
 * @param {number} [options.limit=5]
 * @param {MemoryStore} [options.store]
 * @returns {Function} Express middleware function.
 */
export function createLimiterWithMemoryStore(options = {}) {
  const windowMs = options.windowMs || 60000;
  const store = options.store || createMemoryStore(windowMs);
  return rateLimit({
    windowMs,
    limit: options.limit || 5,
    store,
    validate: false,
    ...options,
  });
}

export { MemoryStore, rateLimit };
export default MemoryStore;
test/contract.mjs
import assert from 'node:assert/strict';
import {
  MemoryStore,
  createMemoryStore,
  recordHit,
  getHitInfo,
  decrementHit,
  resetKey,
  resetAllKeys,
  createLimiterWithMemoryStore,
  rateLimit
} from '../src/index.mjs';

function createMockReq(options = {}) {
  return {
    ip: options.ip || '127.0.0.1',
    path: options.path || '/',
    headers: options.headers || {},
    get(name) {
      return this.headers[name.toLowerCase()] || '';
    },
    ...options
  };
}

function createMockRes() {
  return {
    statusCode: 200,
    headers: {},
    body: undefined,
    ended: false,
    setHeader(name, value) {
      this.headers[name.toLowerCase()] = String(value);
      return this;
    },
    getHeader(name) {
      return this.headers[name.toLowerCase()];
    },
    status(code) {
      this.statusCode = code;
      return this;
    },
    send(body) {
      this.body = body;
      this.ended = true;
      return this;
    }
  };
}

function runMiddleware(middleware, req, res) {
  return new Promise((resolve) => {
    let nextCalled = false;
    const next = (err) => {
      nextCalled = true;
      resolve({ nextCalled, err });
    };
    Promise.resolve(middleware(req, res, next)).then(() => {
      if (!nextCalled && res.ended) {
        resolve({ nextCalled: false });
      }
    });
  });
}

// 1. MemoryStore initializes with windowMs and sets localKeys flag to true
{
  const store = createMemoryStore(60000);
  assert.equal(store.localKeys, true);
  assert.equal(store.windowMs, 60000);
  store.shutdown();
}

// 2. MemoryStore increment records hits and returns totalHits count and resetTime Date
{
  const store = createMemoryStore(60000);
  const result1 = await recordHit(store, 'user-1');
  assert.equal(result1.totalHits, 1);
  assert.ok(result1.resetTime instanceof Date);

  const initialResetTime = result1.resetTime.getTime();
  const result2 = await recordHit(store, 'user-1');
  assert.equal(result2.totalHits, 2);
  assert.equal(result2.resetTime.getTime(), initialResetTime);
  store.shutdown();
}

// 3. MemoryStore get retrieves hit count and resetTime for active keys and returns undefined for unknown keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'user-2');
  const info = await getHitInfo(store, 'user-2');
  assert.ok(info !== undefined);
  assert.equal(info.totalHits, 1);
  assert.ok(info.resetTime instanceof Date);

  const unknownInfo = await getHitInfo(store, 'unknown-user');
  assert.equal(unknownInfo, undefined);
  store.shutdown();
}

// 4. MemoryStore decrement reduces totalHits without dropping below zero
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'user-3');
  await recordHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 2);

  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 1);

  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 0);

  // Decrementing when totalHits is 0 should not go negative
  await decrementHit(store, 'user-3');
  assert.equal((await getHitInfo(store, 'user-3')).totalHits, 0);
  store.shutdown();
}

// 5. MemoryStore resetKey clears hit records for a specific key
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'key-a');
  await recordHit(store, 'key-b');

  await resetKey(store, 'key-a');
  assert.equal(await getHitInfo(store, 'key-a'), undefined);
  assert.equal((await getHitInfo(store, 'key-b')).totalHits, 1);
  store.shutdown();
}

// 6. MemoryStore resetAll clears hit records for all keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'key-1');
  await recordHit(store, 'key-2');

  await resetAllKeys(store);
  assert.equal(await getHitInfo(store, 'key-1'), undefined);
  assert.equal(await getHitInfo(store, 'key-2'), undefined);
  store.shutdown();
}

// 7. MemoryStore resets totalHits when incremented after windowMs expiration
{
  const store = createMemoryStore(50);
  const first = await recordHit(store, 'short-lived');
  assert.equal(first.totalHits, 1);
  const firstResetTime = first.resetTime.getTime();

  await new Promise((r) => setTimeout(r, 70));

  const afterExpiry = await recordHit(store, 'short-lived');
  assert.equal(afterExpiry.totalHits, 1);
  assert.ok(afterExpiry.resetTime.getTime() > firstResetTime);
  store.shutdown();
}

// 8. MemoryStore shutdown stops internal timers and resets all stored keys
{
  const store = createMemoryStore(60000);
  await recordHit(store, 'shutdown-key');
  assert.equal((await getHitInfo(store, 'shutdown-key')).totalHits, 1);

  store.shutdown();
  assert.equal(await getHitInfo(store, 'shutdown-key'), undefined);
}

// 9. MemoryStore integrates seamlessly as the store option for rateLimit middleware
{
  const store = createMemoryStore(60000);
  const limiter = createLimiterWithMemoryStore({
    limit: 2,
    windowMs: 60000,
    store
  });

  const req1 = createMockReq({ ip: '10.10.10.1' });
  const res1 = createMockRes();
  const res1Status = await runMiddleware(limiter, req1, res1);
  assert.equal(res1Status.nextCalled, true);
  assert.equal(res1.statusCode, 200);

  const req2 = createMockReq({ ip: '10.10.10.1' });
  const res2 = createMockRes();
  const res2Status = await runMiddleware(limiter, req2, res2);
  assert.equal(res2Status.nextCalled, true);

  const req3 = createMockReq({ ip: '10.10.10.1' });
  const res3 = createMockRes();
  const res3Status = await runMiddleware(limiter, req3, res3);
  assert.equal(res3Status.nextCalled, false);
  assert.equal(res3.statusCode, 429);

  store.shutdown();
}

console.log('Contract assertions passed.');

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