A simple in-memory cache which can create multiple instances and keep track of misses and hits, forked from npm memory-cache

Usage no npm install needed!

<script type="module">
  import easyMemoryCache from 'https://cdn.skypack.dev/easy-memory-cache';



An easy in-memory cache for node.js, based and forked from Memory-cache


npm install easy-memory-cache --save


var cache = require('memory-cache');

// now just use the cache
cache.put('foo', 'bar');

// that wasn't too interesting, here's the good part

cache.put('houdini', 'disappear', 100, function(key, value) {
    console.log(key + ' did ' + value);
}); // Time in ms

console.log('Houdini will now ' + cache.get('houdini'));

setTimeout(function() {
    console.log('Houdini is ' + cache.get('houdini'));
}, 200);

which should print

Houdini will now disappear
Houdini did disappear
Houdini is null


createCache = function()

  • The function createCache on the global cache object, creates a completely new instance of the cache.
  • Returns the new cache instance.

put = function(key, value, time, timeoutCallback)

  • Simply stores a value
  • If time isn't passed in, it is stored forever
  • Will actually remove the value in the specified time in ms (via setTimeout)
  • timeoutCallback is optional function fired after entry has expired with key and value passed (function(key, value) {})
  • Returns the cached value

get = function(key)

  • Retrieves a value for a given key
  • If value isn't cached, returns null

del = function(key)

  • Deletes a key, returns a boolean specifying whether or not the key was deleted

clear = function()

  • Deletes all keys

size = function()

  • Returns the current number of entries in the cache

memsize = function()

  • Returns the number of entries taking up space in the cache
  • Will usually == size() unless a setTimeout removal went wrong

debug = function(bool)

  • Turns on or off debugging

hits = function()

  • Returns the number of cache hits

misses = function()

  • Returns the number of cache misses

keys = function()

  • Returns all the cache keys

Note on Patches/Pull Requests

  • Fork the project.
  • Make your feature addition or bug fix.
  • Send me a pull request.