Redis cache with Express

redis.js

const express = require('express');
const axios = require('axios');
const redis = require('redis');
const cors = require('cors');

const PORT = 8000;
const DEFAULT_EXPIRATION = 3600;
const API_URL = "https://jsonplaceholder.typicode.com/photos"

const app = express();
app.use(express.urlencoded({ extended: true }));
app.use(cors());

// Empty arg bc Redis is running on localhost
const redisClient = redis.createClient();

function getOrSetCache(key, callback) {
    return new Promise((resolve, reject) => {
        // Redis GET
        redisClient.get(key, async (err, data) => {
            if (err) return reject(err);
            if (data != null) return resolve(JSON.parse(data));
            const freshData = await callback();
            // Redis SETEX
            redisClient.setex(key, DEFAULT_EXPIRATION, JSON.stringify(freshData));
            return resolve(freshData);
        })
    })
}

app.get('/photos', async (req, res) => {
    const albumId = req.query.albumId
    const data = await getOrSetCache(`photos?albumId=${albumId}`, async () => {
        const { data } = await axios.get(`${API_URL}`, {
            params: { albumId }
        });
        return data;
    });
    res.json(data).end()
})

app.listen(PORT, () => {
    console.log(`Server listening on port ${PORT}`)
})