Redis integration for distributed cache in Express - Mini Project: Build & Apply

Redis integration for distributed cache

📖 Scenario: You are building a simple Express server that uses Redis as a distributed cache to store and retrieve user session data quickly.

🎯 Goal: Create an Express app that connects to Redis, sets a cache entry for a user session, and retrieves it on request.

📋 What You'll Learn

Create a Redis client using the redis package

Configure the Redis client connection

Set a user session key-value pair in Redis

Retrieve the user session data from Redis in an Express route

💡 Why This Matters

🌍 Real World

Redis is widely used to cache session data, speeding up web applications by reducing database load.

💼 Career

Understanding Redis integration is valuable for backend developers working on scalable, high-performance web services.

1

Setup Redis client

Create a Redis client using createClient() from the redis package and assign it to a constant called redisClient.

Express

// Your code here

Need a hint?

Use import { createClient } from 'redis' and then const redisClient = createClient().

2

Connect Redis client

Add an async function called connectRedis that calls await redisClient.connect() to connect the Redis client.

Express

import express from 'express';
import { createClient } from 'redis';

const redisClient = createClient();

// Your code here

Need a hint?

Define async function connectRedis() and inside it call await redisClient.connect().

3

Set user session in Redis

Inside an Express route /set-session, use await redisClient.set() to store the key user:123 with value "active".

Express

import express from 'express';
import { createClient } from 'redis';

const redisClient = createClient();

async function connectRedis() {
    await redisClient.connect();
}

await connectRedis();

const app = express();

// Your code here

Need a hint?

Create a GET route /set-session and inside use await redisClient.set('user:123', 'active').

4

Retrieve user session from Redis

Add an Express route /get-session that uses await redisClient.get('user:123') to get the session value and sends it in the response.

Express

import express from 'express';
import { createClient } from 'redis';

const redisClient = createClient();

async function connectRedis() {
    await redisClient.connect();
}

await connectRedis();

const app = express();

app.get('/set-session', async (req, res) => {
    await redisClient.set('user:123', 'active');
    res.send('Session set');
});

// Your code here

Need a hint?

Create a GET route /get-session and inside use await redisClient.get('user:123') to retrieve the session.