Registry / storage / simple-in-memory-cache

simple-in-memory-cache

library0.4.0jsnpmunverified

A minimal in-memory cache library for Node.js and the browser, supporting time-based expiration (TTL) policies. Version 0.4.0 provides a simple key-value store with configurable default expiration and per-item overrides, type definitions shipped, and zero dependencies. Designed for lightweight caching needs where full-featured solutions like lru-cache or node-cache are overkill, with a focus on a clean API and ease of use. Last updated in 2020, it is considered stable but in maintenance mode.

storage

npm install simple-in-memory-cache

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · SIMPLE-IN-MEMORY-C

simple-in-memory-cache

storagejavascriptv0.4.0

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.

createCache

✓ import { createCache } from 'simple-in-memory-cache'

✗ import createCache from 'simple-in-memory-cache'

This is a named export, not a default export.

Cache

✓ import { type Cache } from 'simple-in-memory-cache'

✗ import { Cache } from 'simple-in-memory-cache'

If you only need the type, use `type` import to avoid runtime issues.

set

✓ const { set } = createCache()

✗ import { set } from 'simple-in-memory-cache'

The `set` function is returned by the `createCache` function, not exported directly.

Demonstrates basic cache operations: set, get, setEx with custom TTL, delete, clear, and size.

import { createCache } from 'simple-in-memory-cache'; const { set, get, setEx, del, clear, size } = createCache({ defaultSecondsUntilExpiration: 60 }); set('key', 'value'); // cached for 60 seconds const value = get('key'); // 'value' setEx('key2', 'value2', 10); // cached for 10 seconds console.log(get('key2')); // 'value2' del('key'); console.log(get('key')); // undefined clear(); console.log(size()); // 0

Debug

Known issues

deprecatedPackage last updated in 2020; no new versions expected.

fix

Consider migrating to actively maintained alternatives like lru-cache or node-cache.

affects: >=0.4.0

gotchaThe `set` function returns a boolean indicating success, but it always returns true; no error handling.

fix

If you need error handling, wrap the call in try/catch or check the return value.

affects: >=0.1.0

gotchaThe `get` function returns `undefined` for expired or missing keys, which can be ambiguous if you stored `undefined` as a value.

fix

Use `has` method or store null instead of undefined to differentiate.

affects: >=0.1.0

Errors

Common errors & fixes

TypeError: createCache is not a function

Importing as default instead of named export.

fix

Use import { createCache } from 'simple-in-memory-cache'

Cannot find module 'simple-in-memory-cache'

Module not installed or path incorrect.

fix

Run npm install --save simple-in-memory-cache

Property 'setEx' does not exist on type '{ set: ... }'

Typo in method name; correct is 'setEx' (not 'setex' or 'setEx' with different casing).

fix

Use setEx('key', 'value', secondsUntilExpiration)

Upgrade

Version history

0.4.0latest on npm

Audit

Dependencies

typescriptoptionalRequired during development to compile, but not a runtime dependency.

Agent activity

30 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/ehmpathy/simple-in-memory-cache ↗

packagesimple-in-memory-cache ↗

homepagehttps://github.com/ehmpathy/simple-in-memory-cache ↗