This is a simple Redis-like in-memory key-value store built using Node.js and TCP sockets.

• PING: Replies with PONG
• ECHO: Replies with the same message
• SET key value: Stores the key-value pair
• SET key value PX milliseconds: Stores the key-value pair with expiry
• GET key: Retrieves the value for the key (if not expired)

Make sure you have Bun installed.

bun install
bun run dev

This starts the TCP server on port 6379.

You can use netcat to send raw RESP (Redis Serialization Protocol) commands.

echo -e '*1\r\n$4\r\nPING\r\n' | nc 127.0.0.1 6379

Response:

+PONG

echo -e '*2\r\n$4\r\nECHO\r\n$5\r\nHello\r\n' | nc 127.0.0.1 6379

Response:

$5
Hello

echo -e '*3\r\n$3\r\nSET\r\n$3\r\nkey\r\n$5\r\nvalue\r\n' | nc 127.0.0.1 6379

Response:

+OK

echo -e '*5\r\n$3\r\nSET\r\n$3\r\nkey\r\n$5\r\nvalue\r\n$2\r\nPX\r\n$4\r\n1000\r\n' | nc 127.0.0.1 6379

Response:

+OK

echo -e '*2\r\n$3\r\nGET\r\n$3\r\nkey\r\n' | nc 127.0.0.1 6379

Response (if key exists):

$5
value

Response (if key does not exist):

$-1

MIT