Learn Just Enough Redis to be Productive

Useful links

• Build & Deploy a Realtime App that Scales with Upstash Redis, Next.js & Fastify
• Upstash Redis

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

• Node.js
• Upstash Redis account (free) https://upstash.com/

What is Redis?

• Key value store
• Can handle lots of different data structures: https://redis.io/docs/data-types/
• Has lots of features that you’d expect from a database:
  • Pub/Sub https://redis.io/docs/interact/pubsub/
  • Transactions https://redis.io/docs/interact/transactions/
  • Persistence https://redis.io/docs/management/persistence/
  • Programmability with Lua https://redis.io/docs/interact/programmability/

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": "john@example.com"}'
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 "alice@example.com"

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