memory-cacher

library1.1.1jsnpmunverified

A lightweight in-memory cache with async value retrieval, deduplication of concurrent requests, and TTL support. Version 1.1.1 is the latest stable release. Published by Logz.io, it provides a simple API to cache asynchronous results, ensuring that multiple calls for the same key during ongoing retrieval will wait for the same promise, avoiding redundant executions. Unlike more feature-rich caches (e.g., node-cache or lru-cache), it focuses on simplicity and async-first design.

storage

npm install memory-cacher

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · MEMORY-CACHER

memory-cacher

storagejavascriptv1.1.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default

✓ import MemoryCacher from 'memory-cacher';

✗ const { MemoryCacher } = require('memory-cacher');

Default import in ESM; CommonJS uses require('memory-cacher').

getCached

✓ import MemoryCacher from 'memory-cacher'; const result = await MemoryCacher.getCached(key, fn, ttl);

✗ import { getCached } from 'memory-cacher';

getCached is a static method on the default export, not a named export.

setCached

✓ import MemoryCacher from 'memory-cacher'; await MemoryCacher.setCached(key, value, ttl);

Also a static method on the default export.

Demonstrates basic usage: caching async result with TTL and retrieving from cache synchronously.

import MemoryCacher from 'memory-cacher'; async function getValue() { // Simulate async operation return new Promise(resolve => setTimeout(() => resolve('cached value'), 100)); } async function main() { const key = 'test'; // First call: executes and caches const result1 = await MemoryCacher.getCached(key, getValue, 5000); console.log(result1); // 'cached value' // Second call (immediate): returns cached value const result2 = await MemoryCacher.getCached(key); console.log(result2); // 'cached value' } main().catch(console.error);

Debug

Known issues

gotchaCalling getCached without a function argument does not throw, but returns null if key not cached.

fix

Check for null or use optional chaining.

affects: >=1.0.0

gotchaTTL parameter is in milliseconds, not seconds.

fix

Ensure you pass TTL in milliseconds.

affects: >=1.0.0

deprecatedThe package has not been updated since 2018 and uses CommonJS only. No TypeScript types.

fix

Consider alternative modern caches like lru-cache or async-cache-dedupe for TypeScript projects.

affects: >=1.0.0

Errors

Common errors & fixes

MemoryCacher is not defined

CommonJS require without variable assignment or ESM import error.

fix

Use const MemoryCacher = require('memory-cacher'); for CommonJS or import MemoryCacher from 'memory-cacher'; for ESM.

getCached(...) is undefined

Calling getCached with no key or non-existent key.

fix

Call getCached with a key that was previously cached or provide a function to compute the value.

Upgrade

Version history

1.1.1latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

13 hits · last 30 days

node

Resources

githubssh://git@github.com/logzio/memory-cacher ↗

packagememory-cacher ↗

homepagehttps://github.com/logzio/memory-cacher#readme ↗