Essential Redis Commands for Developers

This cheatsheet provides a quick reference for commonly used Redis commands, categorized for easy access. Redis is a powerful open-source, in-memory data structure store used as a database, cache, and message broker. Understanding its core commands is crucial for efficient development.

Key Management Commands

Manage your Redis keys effectively with these fundamental commands.

# Get the type of a key
TYPE key

# Delete keys
DEL key [key ...]

# Check if a key exists
EXISTS key

# Set a timeout on a key
EXPIRE key seconds
# Set a timeout in milliseconds
PEXPIRE key milliseconds

# Get the remaining time to live of a key
TTL key
# Get remaining time in milliseconds
PTTL key

# Persist a key (remove its timeout)
PERSIST key

# Rename a key
RENAME key newkey

# Get a random key
RANDOMKEY
                

String Commands

Work with Redis strings, which can be any sequence of bytes.

# Set a string value
SET key value

# Get a string value
GET key

# Append a value to a string
APPEND key value

# Get a substring of a string
GETRANGE key start end

# Increment a number stored in a string
INCR key
INCRBY key increment

# Decrement a number stored in a string
DECR key
DECRBY key decrement
                

List Commands

Redis lists are linked lists, useful for implementing queues and stacks.

# Add an element to the head of a list
LPUSH key element [element ...]

# Add an element to the tail of a list
RPUSH key element [element ...]

# Get an element from the head of a list and remove it
LPOP key

# Get an element from the tail of a list and remove it
RPOP key

# Get elements from a list
LRANGE key start end

# Get the length of a list
LLEN key
                

Hash Commands

Hashes are maps between string fields and string values, perfect for representing objects.

# Set a field in a hash
HSET hash field value

# Get a field from a hash
HGET hash field

# Get all fields and values from a hash
HGETALL hash

# Get all fields from a hash
HKEYS hash

# Get all values from a hash
HVALS hash

# Check if a field exists in a hash
HEXISTS hash field
                

Set Commands

Sets are unordered collections of unique strings.

# Add members to a set
SADD set member [member ...]

# Get all members of a set
SMEMBERS set

# Check if a member is in a set
SISMEMBER set member

# Remove members from a set
SREM set member [member ...]

# Get the number of members in a set
SCARD set
                

Sorted Set Commands

Sorted sets are sets where each member has a score, ordered by score.

# Add members to a sorted set
ZADD sorted_set score member [score member ...]

# Get members in a range by score
ZRANGE sorted_set start end [WITHSCORES]

# Get members in a range by rank
ZRANGEBYRANK sorted_set start end [WITHSCORES]

# Get the score of a member
ZSCORE sorted_set member

# Get the number of members in a sorted set
ZCARD sorted_set
                

Pub/Sub Commands

Enable real-time messaging between clients.

# Subscribe to channels
SUBSCRIBE channel [channel ...]

# Publish a message to a channel
PUBLISH channel message
                

Transactions

Group multiple commands into a single atomic operation.

# Start a transaction
MULTI

# Queue commands
SET key value
GET key

# Execute the transaction
EXEC

# Discard the transaction
DISCARD
                

Connection Commands

Manage client connections.

# Ping the server
PING

# Authenticate to the server
AUTH password

# Select a database
SELECT db_index

# Quit the connection
QUIT
                

Further Resources

• Official Redis Commands Documentation
• Redis Documentation
• MDN Web Docs (for general web development context)