A robust, performance-focused and full-featured Redis client for Node.js.

Supports Redis >= 2.6.12. Completely compatible with Redis 7.x.

ioredis is a stable project and maintenance is done on a best-effort basis for relevant issues (contributions to ioredis will still be evaluated, reviewed, and merged when they benefit the project). For new projects, node-redis is the recommended client library. node-redis is the open-source (MIT license) Redis JavaScript client library redesigned from the ground up and actively maintained. node-redis supports new (hash-field expiration) and future commands and the capabilities available in Redis Stack and Redis 8 (search, JSON, time-series, probabilistic data structures).

Features

ioredis is a robust, full-featured Redis client that is used in the world's biggest online commerce company Alibaba and many other awesome companies.

Full-featured. It supports Cluster, Sentinel, Streams, Pipelining, and of course Lua scripting, Redis Functions, Pub/Sub (with the support of binary messages).
High performance 🚀.
Delightful API 😄. It works with Node callbacks and Native promises.
Transformation of command arguments and replies.
Transparent key prefixing.
Abstraction for Lua scripting, allowing you to define custom commands.
Supports binary data.
Supports TLS 🔒.
Supports offline queue and ready checking.
Supports ES6 types, such as Map and Set.
Supports GEO commands 📍.
Supports Redis ACL.
Sophisticated error handling strategy.
Supports NAT mapping.
Supports autopipelining.

100% written in TypeScript and official declarations are provided:

Versions

| Version | Branch | Node.js Version | Redis Version | | -------------- | ------ | --------------- | --------------- | | 5.x.x (latest) | main | >= 12 | 2.6.12 ~ latest | | 4.x.x | v4 | >= 8 | 2.6.12 ~ 7 |

Refer to CHANGELOG.md for features and bug fixes introduced in v5.

🚀 Upgrading from v4 to v5

Quick Start

Install

npm install ioredis

In a TypeScript project, you may want to add TypeScript declarations for Node.js:

npm install --save-dev @types/node

Basic Usage

// Import ioredis.
// You can also use `import { Redis } from "ioredis"`
// if your project is a TypeScript project,
// Note that `import Redis from "ioredis"` is still supported,
// but will be deprecated in the next major version.
const Redis = require("ioredis");

// Create a Redis instance.
// By default, it will connect to localhost:6379.
// We are going to cover how to specify connection options soon.
const redis = new Redis();

redis.set("mykey", "value"); // Returns a promise which resolves to "OK" when the command succeeds.

// ioredis supports the node.js callback style
redis.get("mykey", (err, result) => {
  if (err) {
    console.error(err);
  } else {
    console.log(result); // Prints "value"
  }
});

// Or ioredis returns a promise if the last argument isn't a function
redis.get("mykey").then((result) => {
  console.log(result); // Prints "value"
});

redis.zadd("sortedSet", 1, "one", 2, "dos", 4, "quatro", 3, "three");
redis.zrange("sortedSet", 0, 2, "WITHSCORES").then((elements) => {
  // ["one", "1", "dos", "2", "three", "3"] as if the command was `redis> ZRANGE sortedSet 0 2 WITHSCORES`
  console.log(elements);
});

// All arguments are passed directly to the redis server,
// so technically ioredis supports all Redis commands.
// The format is: redis[SOME_REDIS_COMMAND_IN_LOWERCASE](ARGUMENTS_ARE_JOINED_INTO_COMMAND_STRING)
// so the following statement is equivalent to the CLI: `redis> SET mykey hello EX 10`
redis.set("mykey", "hello", "EX", 10);

See the examples/ folder for more examples. For example:

All Redis commands are supported. See the documentation for details.

Connect to Redis

When a new Redis instance is created, a connection to Redis will be created at the same time. You can specify which Redis to connect to by:

new Redis(); // Connect to 127.0.0.1:6379
new Redis(6380); // 127.0.0.1:6380
new Redis(6379, "192.168.1.1"); // 192.168.1.1:6379
new Redis("/tmp/redis.sock");
new Redis({
  port: 6379, // Redis port
  host: "127.0.0.1", // Redis host
  username: "default", // needs Redis >= 6
  password: "my-top-secret",
  db: 0, // Defaults to 0
});

You can also specify connection options as a redis:// URL or rediss:// URL when using TLS encryption:

// Connect to 127.0.0.1:6380, db 4, using password "authpassword":
new Redis("redis://:authpassword@127.0.0.1:6380/4");

// Username can also be passed via URI.
new Redis("redis://username:authpassword@127.0.0.1:6380/4");

See API Documentation for all available options.

Pub/Sub

Redis provides several commands for developers to implement the Publish–subscribe pattern. There are two roles in this pattern: publisher and subscriber. Publishers are not programmed to send their messages to specific subscribers. Rather, published messages are characterized into channels, without knowledge of what (if any) subscribers there may be.

By leveraging Node.js's built-in events module, ioredis makes pub/sub very straightforward to use. Below is a simple example that consists of two files, one is publisher.js that publishes messages to a channel, the other is subscriber.js that listens for messages on specific channels.

// publisher.js

const Redis = require("ioredis");
const redis = new Redis();

setInterval(() => {
  const message = { foo: Math.random() };
  // Publish to my-channel-1 or my-channel-2 randomly.
  const channel = `my-channel-${1 + Math.round(Math.random())}`;

  // Message can be either a string or a buffer
  redis.publish(channel, JSON.stringify(message));
  console.log("Published %s to %s", message, channel);
}, 1000);

// subscriber.js

const Redis = require("ioredis");
const redis = new Redis();

redis.subscribe("my-channel-1", "my-channel-2", (err, count) => {
  if (err) {
    // Just like other commands, subscribe() can fail for some reasons,
    // ex network issues.
    console.error("Failed to subscribe: %s", err.message);
  } else {
    // `count` represents the number of channels this client are currently subscribed to.
    console.log(
      `Subscribed successfully! This client is currently subscribed to ${count} channels.`
    );
  }
});

redis.on("message", (channel, message) => {
  console.log(`Received ${message} from ${channel}`);
});

// There's also an event called 'messageBuffer', which is the same as 'message' except
// it returns buffers instead of strings.
// It's useful when the messages are binary data.
redis.on("messageBuffer", (channel, message) => {
  // Both `channel` and `message` are buffers.
  console.log(channel, message);
});

It's worth noticing that a connection (aka a Redis instance) can't play both roles at the same time. More specifically, when a client issues subscribe() or psubscribe(), it enters the "subscriber" mode. From that point, only commands that modify the subscription set are valid. Namely, they are: subscribe, psubscribe, unsubscribe, punsubscribe, ping,

Ioredis

Install / Use

README