Redis supports these core data types, each with its own commands:
- Strings: text, numbers or binary data, up to 512MB.
- Hashes: field-value pairs, like an object.
- Lists: strings in insertion order.
- Sets: unique strings with no order.
- Sorted sets, or ZSets: unique strings ordered by a score.
- Bitmaps: a string used as an array of bits.
- HyperLogLog: a probabilistic structure that estimates cardinality, the number of unique items.
- Geospatial indexes: longitude and latitude points you search by radius.
- Streams: append-only logs of events, used as message queues.
Redis 8 adds JSON, time series and probabilistic types such as Bloom filters. It also adds vector sets for similarity search.
SET mykey "hello" # String
HSET user:1 name "John" # Hash
LPUSH mylist "item1" # List
SADD myset "member1" # Set
ZADD myzset 1 "item1" # Sorted Set
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