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Learn Just Enough Redis to be Productive

Useful links

What you will learn

  • What Redis is
  • Why Redis is so popular
  • How to use Redis
  • How to use Redis to solve some common problems in Node.js

What you will need

What is Redis?

Video sturcture

  1. Getting started with Upstash Redis
  2. Basic commands & data structures
  3. Problems Redis can solve
    • Caching
    • Rate limiting
    • Pub/Sub
    • Indexes
    • Transactions

Basic commands

https://redis.io/commands/

  • Set set mykey tom
  • Get get mykey
  • Del DEL mykey
  • Set with TTL SETEX key seconds value
  • Check if key exists EXISTS mykey
  • List keys KEYS *

Data structures

JSON

SET user:100 '{"name": "John", "age": 30, "email": "[email protected]"}'
GET user:100

Hash Hashes are used to store objects, represented by fields and values.

HSET user:101 name "Alice"
HSET user:101 age 24
HSET user:101 email "[email protected]"

HGET user:101 name

Sets Sets are collections of unique elements

SADD myset 1 2 3

SMEMBERS myset
SADD users tom
SADD users alice
SADD users tom

SMEMBERS users

Sorted Sets Sorted sets are similar to sets, but every member of a sorted set is associated with a score, that is used in order to take the sorted set ordered, from the smallest to the greatest score.

ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"

ZRANGE myzset 0 -1

Counters

INCR counter
INCRBY counter 10
DECR counter
DECRBY counter 5

GET counter