# `createClient` configuration | Property | Default | Description | |------------------------------|------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | url | | `redis[s]://[[username][:password]@][host][:port][/db-number]` (see [`redis`](https://www.iana.org/assignments/uri-schemes/prov/redis) and [`rediss`](https://www.iana.org/assignments/uri-schemes/prov/rediss) IANA registration for more details) | | socket | | Socket connection properties. Unlisted [`net.connect`](https://nodejs.org/api/net.html#socketconnectoptions-connectlistener) properties (and [`tls.connect`](https://nodejs.org/api/tls.html#tlsconnectoptions-callback)) are also supported | | socket.port | `6379` | Redis server port | | socket.host | `'localhost'` | Redis server hostname | | socket.family | `0` | IP Stack version (one of `4 \| 6 \| 0`) | | socket.path | | Path to the UNIX Socket | | socket.connectTimeout | `5000` | Connection timeout (in milliseconds) | | socket.socketTimeout | | The maximum duration (in milliseconds) that the socket can remain idle (i.e., with no data sent or received) before being automatically closed | | socket.noDelay | `true` | Toggle [`Nagle's algorithm`](https://nodejs.org/api/net.html#net_socket_setnodelay_nodelay) | | socket.keepAlive | `true` | Toggle [`keep-alive`](https://nodejs.org/api/net.html#socketsetkeepaliveenable-initialdelay) functionality | | socket.keepAliveInitialDelay | `5000` | If set to a positive number, it sets the initial delay before the first keepalive probe is sent on an idle socket | | socket.tls | | See explanation and examples [below](#TLS) | | socket.reconnectStrategy | Exponential backoff with a maximum of 2000 ms; plus 0-200 ms random jitter. | A function containing the [Reconnect Strategy](#reconnect-strategy) logic | | username | | ACL username ([see ACL guide](https://redis.io/topics/acl)) | | password | | ACL password or the old "--requirepass" password | | name | | Client name ([see `CLIENT SETNAME`](https://redis.io/commands/client-setname)) | | database | | Redis database number (see [`SELECT`](https://redis.io/commands/select) command) | | modules | | Included [Redis Modules](../README.md#packages) | | scripts | | Script definitions (see [Lua Scripts](../README.md#lua-scripts)) | | functions | | Function definitions (see [Functions](../README.md#functions)) | | commandsQueueMaxLength | | Maximum length of the client's internal command queue | | disableOfflineQueue | `false` | Disables offline queuing, see [FAQ](./FAQ.md#what-happens-when-the-network-goes-down) | | readonly | `false` | Connect in [`READONLY`](https://redis.io/commands/readonly) mode | | legacyMode | `false` | Maintain some backwards compatibility (see the [Migration Guide](./v3-to-v4.md)) | | isolationPoolOptions | | An object that configures a pool of isolated connections, If you frequently need isolated connections, consider using [createClientPool](https://github.com/redis/node-redis/blob/master/docs/pool.md#creating-a-pool) instead | | pingInterval | | Send `PING` command at interval (in ms). Useful with ["Azure Cache for Redis"](https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-best-practices-connection#idle-timeout) | | disableClientInfo | `false` | Disables `CLIENT SETINFO LIB-NAME node-redis` and `CLIENT SETINFO LIB-VER X.X.X` commands | ## Reconnect Strategy When the socket closes unexpectedly (without calling `.quit()`/`.disconnect()`), the client uses `reconnectStrategy` to decide what to do. The following values are supported: 1. `false` -> do not reconnect, close the client and flush the command queue. 2. `number` -> wait for `X` milliseconds before reconnecting. 3. `(retries: number, cause: Error) => false | number | Error` -> `number` is the same as configuring a `number` directly, `Error` is the same as `false`, but with a custom error. By default the strategy uses exponential backoff, but it can be overwritten like so: ```javascript createClient({ socket: { reconnectStrategy: (retries, cause) => { // By default, do not reconnect on socket timeout. if (cause instanceof SocketTimeoutError) { return false; } // Generate a random jitter between 0 – 200 ms: const jitter = Math.floor(Math.random() * 200); // Delay is an exponential back off, (times^2) * 50 ms, with a maximum value of 2000 ms: const delay = Math.min(Math.pow(2, retries) * 50, 2000); return delay + jitter; } } }); ``` ## TLS To enable TLS, set `socket.tls` to `true`. Below are some basic examples. > For configuration options see [tls.connect](https://nodejs.org/api/tls.html#tlsconnectoptions-callback) and [tls.createSecureContext](https://nodejs.org/api/tls.html#tlscreatesecurecontextoptions), as those are the underlying functions used by this library. ### Create a SSL client ```javascript createClient({ socket: { tls: true, ca: '...', cert: '...' } }); ``` ### Create a SSL client using a self-signed certificate ```javascript createClient({ socket: { tls: true, rejectUnauthorized: false, cert: '...' } }); ``` ## Connection Pooling In most cases, a single Redis connection is sufficient, as the node-redis client efficiently handles commands using an underlying socket. Unlike traditional databases, Redis does not require connection pooling for optimal performance. However, if your use case requires exclusive connections see [RedisClientPool](https://github.com/redis/node-redis/blob/master/docs/pool.md), which allows you to create and manage multiple dedicated connections.