memfs

In-memory file-system with Node's fs API.
v4.50.0 URL: https://unpkg.com/memfs@4.50.0/lib/index.js
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fsfilesystemfs.jsmemory-fsmemfsfilefile systemmountmemoryin-memoryvirtualtesttestingmockfsafile system accessnative file systemwebfscrudfsopfscasfscontent addressable storage

node-schedule

A cron-like and not-cron-like job scheduler for Node.
v2.1.1 URL: https://unpkg.com/node-schedule@2.1.1/index.js
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scheduletaskjobcronrecurrentin-memory

@cacheable/memory

High Performance In-Memory Cache for Node.js
v2.0.4 URL: https://unpkg.com/@cacheable/memory@2.0.4/dist/index.cjs
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cacheablehigh performancedistributed cachingKeyv storage enginekeyvmemory cachingLRU cachememoryin-memoryscalable cachein-memory cachelruSizelru

fake-indexeddb

Fake IndexedDB: a pure JS in-memory implementation of the IndexedDB API
v6.2.4 URL: https://unpkg.com/fake-indexeddb@6.2.4/build/cjs/index.js
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indexeddbdatastoredatabaseembeddednosqlin-memorypolyfillshim

ioredis-mock

This library emulates ioredis by performing all operations in-memory.
v8.13.1 URL: https://unpkg.com/ioredis-mock@8.13.1/browser.js
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fakeredisin-memoryioredisioredis-mockmock-ioredismock-redisredisredis fakeredis inmemoryredis jsredis memoryredis mockredis standaloneredis testredis testingredis-jsredis-mockredisjs