I Built a Redis Clone from Scratch in Node.js — RESP, Persistence, Replication, Pub/Sub and Transactions (opens in new tab)

Most of us use Redis like this: SET name Alice GET name It feels simple. You send a command. Redis stores something. You get the value back. But I wanted to understand what actually happens behind that simplicity. So I built a Redis-compatible server from scratch in Node.js. Not a wrapper around Redis. Not a client library. Not a toy object in memory. A real TCP server that can understand Redis-style commands, parse the RESP protocol, store data in memory, persist writes, support transactions...