Basic Operations with node_redis
Tags: redis, node
Published: 2022-09-13 12:26:01

---
title: Basic Operations with node_redis
published: true
date: 2022-06-05 10:23:34 UTC
tags: #redis #node
canonical_url: 
---

![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ray88qsbcpqyuic9x73f.png)




## node\_redis

node\_redis is a modern, high-performance Redis client for Node.js. It has over 3,658,902 Weekly Downloads and has in-build support for all Redis commands. it uses the raw Redis command with all capital letters as well as a camel-cased version of these commands.

**Examples:**

```
// Redis commands syntex
await client.SET('key', 'field', 'value');
await client.GET('key');


// camel cased commands
await client.rPush('key', 'value');
await client.lRange('key', from, to);

```

## Installing node\_redis in Javascript

```
npm i redis

```

## Javascript Datatype Mapping with Redis Type

| **Javascript Datatype** | **Redis Type** |
| String | string |
| Array of String | list |
| Array of String | set |
| Integer | number |
| String | float |
| Object | hash |

## Redis Command Using node\_redis

![1529926.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1654424351383/3rnxBDuFe.png)

* * *

### Hash Commands

- HSET: Sets the string value of a hash field.

**Redis Example**

```
HSET id key "value"

```

**Output**

```
OK

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HSET('id', 'key', 'value').then((res) => {
  console.log('Set key value : ', res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
Set key value : 0

```

- HGET: Gets the value of a hash field stored at the specified key.

**Redis Example**

```
HGET id key

```

**Output**

```
value

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.get('key').then((res) => {
  console.log('Get key value : ', res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
Get key value : value

```

- HMGET: Gets the values of all the given hash fields.

**Redis Example**

```
HMGET id key1 key2

```

**Output**

```
1) "value"
2) "value1"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HMGET('id', ['key1', 'key2']).then((res) => {
  console.log('Get key value : ', res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
Get key value : ['hello', 'world']

```

- HMSET: Sets multiple hash fields to multiple values.

**Redis Example**

```
HMSET id key1 "Hello" key2 "World"

```

**Output**

```
OK

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();
client.HSET('id', ['key1', 'hello', 'key2', 'world']).then((res) => {
  console.log('Set key value : ', res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
Set key value : 1

```

- HDEL: Deletes one or more hash fields.

**Redis Example**

```
HDEL id key1

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HDEL('id', 'key1').then((res) => {
  console.log('Deleted key1 : ', res);
});

```

**Output**

```
Redis Client Connected
Deleted key1 : 1

```

- HEXISTS: Determines whether a hash field exists or not.

**Redis Example**

```
HEXISTS id key1

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HEXISTS('id', 'key1').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
false

```

- HGETALL: Gets all the fields and values Stored in a hash.

**Redis Example**

```
HGETALL id key1

```

**Output**

```
 1) "key"
 2) "value"
 3) "key2"
 4) "world"
 5) "numkey"
 6) "10"
 7) "floatkey"
 8) "10.2"
 9) "key1"
10) "value1"
11) "key11"
12) "value1"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HGETALL('id').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
[Object: null prototype] { key: 'value', key2: 'world' }

```

- HINCRBY: Increments the integer value of a hash field by the given number.

**Redis Example**

```
HINCRBY id numkey 3

```

**Output**

```
6


HINCRBY id numkey 3

```

**Output**

```
9

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HSET('id', 'numkey', 9).then((res) => {
  console.log('set numkey', res);
});

client.HINCRBY('id', 'numkey', 1).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
set numkey 1
10

```

- HINCRBYFLOAT: Increments the float value of a hash field by the given amount.

**Redis Example**

```
HINCRBYFLOAT id floatkey 0.5

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HSET('id', 'floatkey', 9.1).then((res) => {
  console.log('set floatkey', res);
});

client.HINCRBYFLOAT('id', 'floatkey', 1.1).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
set floatkey 1
10.2

```

- HKEYS: Gets all the fields in a hash.

**Redis Example**

```
HKEYS id

```

**Output**

```
1) "key"
2) "key2"
3) "numkey"
4) "floatkey"
5) "key1"
6) "key11"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HKEYS('id').then((keys) => {
  console.log(keys);
  client.quit();
});

```

**Output**

```
Redis Client Connected
['key', 'key2', 'numkey', 'floatkey', 'key1', 'key11']

```

- HLEN: Gets the number of fields in a hash.

**Redis Example**

```
HLEN id

```

**Output**

```
4

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HLEN('id').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
4

```

- HSETNX: Sets the value of a hash field, only if the field does not exist.

**Redis Example**

```
HSETNX id key1 value1

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HSETNX('id', 'key1', 'value1').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
true

```

- HVALS: Gets all the values in a hash

**Redis Example**

```
HVALS id

```

**Output**

```
1) "value"
2) "world"
3) "10"
4) "10.2"
5) "value1"
6) "value1"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HVALS('id').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
['value', 'world', '10', '10.2', 'value1', 'value1']

```

- HSCAN: Incrementally iterates hash fields and associated values.

**Redis Example**

```
HSCAN id curser


HSCAN id 0

```

**Output**

```
1) "0"
2) 1) "key"
    2) "value"
    3) "key2"
    4) "world"
    5) "numkey"
    6) "10"
    7) "floatkey"
    8) "10.2"
    9) "key1"
   10) "value1"
   11) "key11"
   12) "value1"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.HSCAN('id', 0).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
{
  cursor: 0,
  tuples: [
    { field: 'key', value: 'value' },
    { field: 'key2', value: 'world' },
    { field: 'numkey', value: '10' },
    { field: 'floatkey', value: '10.2' },
    { field: 'key1', value: 'value1' },
    { field: 'key11', value: 'value1' }
  ]
}

```

* * *

### List commands

- [BLPOP](https://redis.io/commands/blpop/): It is the blocking version of LPOP as it Removes and gets the first element in a list, or blocks until one is available

**Redis Example**

```
 BLPOP list1 list2 timeout

```

**Output**

```
1) "list1"
2) "a"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.BLPOP('mylist', 2).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
{ key: 'mylist', element: 'three' }

```

- [BRPOP](https://redis.io/commands/brpop/): Removes and gets the last element in a list, or blocks until one is available

**Redis Example**

```
BRPOP list1 list2 timeout

```

**Output**

```
1) "list1"
2) "hello"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.BRPOP('mylist', 1).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
null

```

- LINDEX: Gets an element from a list by its index

**Redis Example**

```
LINDEX mylist position


LINDEX mylist 0

```

**Output**

```
"hello"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LINDEX('mylist', 0).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
nice

```

- LINSERT: Insert an element before or after another element in a list

**Redis Example**

```
LINSERT mylist BEFORE "World" "There"

```

**Output**

```
3

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LINSERT('mylist', 'BEFORE', 'nice', 'three').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
4

```

- LLEN: Gets the length of a list

**Redis Example**

```
LLEN mylist

```

**Output**

```
2

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LLEN('mylist').then((length) => {
  console.log(length);
  client.quit();
});

```

**Output**

```
Redis Client Connected
4

```

- LPOP: Removes and gets the first element in a list

**Redis Example**

```
LPOP mylist

```

**Output**

```
"three"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LPOP('mylist').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
nice

```

- LPUSH: Prepends one or multiple values to a list

**Redis Example**

```
LPUSH mylist "hello"

```

**Output**

```
7

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LPUSH('mylist', 'one').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
3

```

- LPUSHX: Prepends a value to a list, only if the list exists

**Redis Example**

```
LPUSHX mylist "Hello"

```

**Output**

```
2

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LPUSHX('mylist', 'value1').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
4

```

- LRANGE: Gets a range of elements from a list

**Redis Example**

```
LRANGE mylist -3 2

```

**Output**

```
1) "one"
2) "two"
3) "three"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LRANGE('mylist', 0, -1).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
['value1', 'one', 'world', 'hello']

```

- LREM: Removes elements from a list

**Redis Example**

```
LREM mylist -2 "hello"

```

**Output**

```
2

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LREM('mylist', 0, 'hello').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```

- LSET: Sets the value of an element in a list by its index

**Redis Example**

```
LSET mylist 0 "four"

```

**Output**

```
OK

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LSET('mylist', 0, 'Hello').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
OK

```

- LTRIM: Trims a list to the specified range

**Redis Example**

```
 LTRIM mylist 1 -1

```

**Output**

```
OK

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.LTRIM('mylist', 1, -1).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
OK

```

- RPOP: Removes and gets the last element in a list

**Redis Example**

```
 RPOP mylist

```

**Output**

```
hello

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.RPOP('mylist').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
hello

```

- RPOPLPUSH: Removes the last element in a list, appends it to another list, and returns it

**Redis Example**

```
 RPOPLPUSH mylist myotherlist

```

**Output**

```
world

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.RPOPLPUSH('mylist', 'myotherlist').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
world

```

- RPUSH: Appends one or multiple values to a list

**Redis Example**

```
RPUSH mylist "hello"

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.RPUSH('mylist', 'hello').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```

- RPUSHX: Appends a value to a list, only if the list exists and returns the length of the list

**Redis Example**

```
RPUSHX mylist "world"

```

**Output**

```
2

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.RPUSHX('mylist', 'world').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
2

```

* * *

### Set Commands

- SADD: Adds one or more members to a set

**Redis Example**

```
SADD myset "Hello"

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('myset', 'Hello').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```

- SCARD: Gets the number of members in a set

**Redis Example**

```
SCARD myset

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SCARD('myset').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```

- SDIFF: Subtracts multiple sets

**Redis Example**

```
SDIFF key1 key2

```

**Output**

```
1) "a"
2) "b"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('key1', 'a', 'b', 'c', 'e').then((res) => {
  console.log(res);
  client.SADD('key2', 'a', 'b', 'd').then((res) => {
    console.log(res);
    client.SDIFF('key1', 'key2').then((res) => {
      console.log(res);
      client.quit();
    });
  });
});

```

**Output**

```
1
1
['a']

```

- SDIFFSTORE: Subtracts multiple sets and stores the resulting set in a key

**Redis Example**

```
SDIFFSTORE key1 key2

```

**Output**

```
2

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('key1', 'a', 'b', 'c', 'e').then((res) => {
  console.log(res);
  client.SADD('key2', 'a', 'b', 'd').then((res) => {
    console.log(res);
    client.SDIFFSTORE('key1', 'key2').then((res) => {
      console.log(res);
      client.quit();
    });
  });
});

```

**Output**

```
Redis Client Connected
1
1
1

```

- SINTER: Intersects multiple sets

**Redis Example**

```
SINTER key1 key2

```

**Output**

```
1
1
['a']

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('key1', 'a', 'b', 'c', 'e').then((res) => {
  console.log(res);
  client.SADD('key2', 'a', 'b', 'd').then((res) => {
    console.log(res);
    client.SINTER('key1', 'key2').then((res) => {
      console.log(res);
      client.quit();
    });
  });
});

```

**Output**

```
Redis Client Connected
1
1
['a']

```

- SINTERSTORE: Intersects multiple sets and stores the resulting set in a key

**Redis Example**

```
SINTERSTORE key key1 key2

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('key1', 'a', 'b', 'c', 'e').then((res) => {
  console.log(res);
  client.SADD('key2', 'a', 'b', 'd').then((res) => {
    console.log(res);
    client.SINTERSTORE('key1', 'key2').then((res) => {
      console.log(res);
      client.quit();
    });
  });
});

```

**Output**

```
Redis Client Connected
1
1
1

```

- SISMEMBER: Determines if a given value is a member of a set

**Redis Example**

```
SISMEMBER myset "one"

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SISMEMBER('myset', 'one').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
false

```

- SMEMBERS: Gets all the members in a set

**Redis Example**

```
SMEMBERS myset

```

**Output**

```
1) "Hello"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SMEMBERS('myset').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
['Hello']

```

- SMOVE: Moves a member from one set to another

**Redis Example**

```
 SMOVE myset myotherset "two"

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SADD('key6', 'a', 'b', 'c', 'e').then((res) => {
  console.log(res);
  client.SADD('key5', 'a', 'b', 'd', 'x').then((res) => {
    console.log(res);
    client.SMOVE('key5', 'key6', 'e').then((res) => {
      console.log(res);
      client.quit();
    });
  });
});

```

**Output**

```
1
1
true

```

- SPOP: Removes and returns a random member from a set

**Redis Example**

```
SPOP myset

```

**Output**

```
three

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SPOP('myset').then((reply) => {
  console.log(reply);
  client.quit();
});

```

**Output**

```
Redis Client Connected
Hello

```

- SRANDMEMBER: Gets one or multiple random members from a set

**Redis Example**

```
SRANDMEMBER myset -5

```

**Output**

```
1) "s"
2) "w"
3) "s"
4) "a"
5) "a"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SRANDMEMBER('myset', -5).then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
a

```

- SREM: Removes one or more members from a set

**Redis Example**

```
SREM myset "a"

```

**Output**

```
1

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SREM('myset', 'a').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```

- SUNION: Adds multiple sets

**Redis Example**

```
SUNION key1 key2

```

**Output**

```
1) "a"

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SUNION('key1', 'key2').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
['a']

```

- SUNIONSTORE: Adds multiple sets and stores the resulting set in a key

**Redis Example**

```
SUNIONSTORE key key1 key2

```

**Output**

```
5

```

**JavaScript Example**

```
const redis = require('redis');

const client = redis.createClient();

client.on('error', (err) => console.log('Redis Client Error', err));
client.on('connect', () => console.log('Redis Client Connected'));

client.connect();

client.SUNIONSTORE('key', 'key1', 'key2').then((res) => {
  console.log(res);
  client.quit();
});

```

**Output**

```
Redis Client Connected
1

```