Redis with node-redis (Node.js)

Uses the official redis package 6.3. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

redis://:secret@redis.example.com:6379/0
redis://:secret@machnosql.example.com:6379/0

The address comes from the environment variable REDIS_URL, so switching to MachNoSQL changes configuration only.

Run

export REDIS_URL='redis://:secret@machnosql.example.com:6379/0'
npm install
npm start

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

app.js

// Cache, counter, session and leaderboard on Redis, unchanged on MachNoSQL.
import { createClient } from "redis";

const client = await createClient({ url: process.env.REDIS_URL }).connect();

await client.set("cache:home", "<html>...</html>", { expiration: { type: "EX", value: 60 } });
console.log("cached:", await client.get("cache:home"), "ttl:", await client.ttl("cache:home"));

console.log("views:", await client.incr("views:home"));

await client.hSet("session:42", { user: "ada", cart_items: "3" });
console.log("session:", await client.hGetAll("session:42"));

await client.zAdd("leaderboard", [
  { score: 120, value: "ada" },
  { score: 95, value: "linus" },
  { score: 130, value: "grace" },
]);
console.log("top:", await client.zRangeWithScores("leaderboard", 0, 2, { REV: true }));

const results = await client
  .multi()
  .incr("orders:count")
  .lPush("orders:recent", "order-1001")
  .lTrim("orders:recent", 0, 99)
  .exec();
console.log("pipeline:", results);

await client.close();

package.json

{
  "name": "machnosql-example-node-redis",
  "private": true,
  "type": "module",
  "scripts": { "start": "node app.js" },
  "dependencies": { "redis": "^6.3.1" }
}