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Emulates ioredis by performing all operations in-memory.

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ioredis-mock · npm npm version Redis Compatibility: 28% semantic-release

This library emulates ioredis by performing all operations in-memory. The best way to do integration testing against redis and ioredis is on a real redis-server instance. However, there are cases where mocking the redis-server is a better option.

Cases like:

  • Your workflow already use a local redis-server instance for the dev server.
  • You're on a platform without an official redis release, that's even worse than using an emulator.
  • You're running tests on a CI, setting it up is complicated. If you combine it with CI that also run selenium acceptance testing it's even more complicated, as two redis-server instances on the same CI build is hard.
  • The GitHub repo have bots that run the testing suite and is limited through npm package.json install scripts and can't fire up servers. (Having Greenkeeper notifying you when a new release of ioredis is out and wether your code breaks or not is awesome).

Check the compatibility table for supported redis commands.

Usage (try it in your browser)

var Redis = require('ioredis-mock');
var redis = new Redis({
  // `` does not exist in `ioredis`, only `ioredis-mock`
  data: {
    user_next: '3',
    emails: {
      '[email protected]': '1',
      '[email protected]': '2',
    'user:1': { id: '1', username: 'superman', email: '[email protected]' },
    'user:2': { id: '2', username: 'batman', email: '[email protected]' },
// Basically use it just like ioredis

Configuring Jest

Use the jest specific bundle when setting up mocks:

jest.mock('ioredis', () => require('ioredis-mock/jest'));


bundle inlines imports from
rely on. Thus you can map
import identifiers to
without dealing with circular issues.

Pub/Sub channels

We also support redis publish/subscribe channels (just like ioredis). Like ioredis, you need two clients:

var Redis = require('ioredis-mock');
var redisPubSub = new Redis();
// create a second Redis Mock (connected to redisPubSub)
var redisSync = redisPubSub.createConnectedClient();
redisPubSub.on('message', (channel, message) => {
  expect(message).toBe('[email protected]');
redisSync.publish('emails', '[email protected]');


By default, ioredis-mock uses the native Promise library. If you need (or prefer) bluebird promises, set

var Promise = require('bluebird');
var Redis = require('ioredis-mock');

Redis.Promise = Promise;

Lua scripting

You can use the

to define custom commands using lua or
to directly execute lua code.

In order to create custom commands, using lua scripting, ioredis exposes the defineCommand method.

You could define a custom command

which accepts one key and one argument. A redis key, where you can get the multiplicand, and an argument which will be the multiplicator:
var Redis = require('ioredis-mock');
const redis = new Redis({ data: { 'k1': 5 } });
const commandDefinition: { numberOfKeys: 1, lua: 'return KEYS[1] * ARGV[1]' };
redis.defineCommand('MULTIPLY', commandDefinition) // defineCommand(name, definition)
  // now we can call our brand new multiply command as an ordinary command
  .then(() => redis.multiply('k1', 10));
  .then(result => {
    expect(result).toBe(5 * 10);

You can also achieve the same effect by using the

var Redis = require('ioredis-mock');
const redis = new Redis({ data: { k1: 5 } });
const result = redis.eval(`return"GET", "k1") * 10`);
expect(result).toBe(5 * 10);

note we are calling the ordinary redis

command by using the global

As a difference from ioredis we currently don't support:

  • dynamic key number by passing the number of keys as the first argument of the command.
  • automatic definition of the custom command buffer companion (i.e. for the custom command
    which returns values using
  • the
  • the


Work on Cluster support has started, the current implementation is minimal and PRs welcome #359

var Redis = require('ioredis-mock');

const cluster = new Redis.Cluster(['redis://localhost:7001']); const nodes = cluster.nodes; expect(nodes.length).toEqual(1);


This project started off as just an utility in another project and got open sourced to benefit the rest of the ioredis community. This means there's work to do before it's feature complete:

  • [x] Setup testing suite for the library itself.
  • [x] Refactor to bluebird promises like ioredis, support node style callback too.
  • [x] Implement remaining basic features that read/write data.
  • [x] Implement ioredis argument and reply transformers.
  • [ ] Connection Events
  • [ ] Offline Queue
  • [x] Pub/Sub
  • [ ] Error Handling
  • [ ] Implement remaining commands

I need a feature not listed here

Just create an issue and tell us all about it or submit a PR with it! 😄

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