nodejs express cache redis

https://sematext.com/blog/expressjs-best-practices/

const express = require('express')
const app = express()
const redis = require('redis')
​
const redisClient = redis.createClient(6379)
​
async function getSomethingFromDatabase (req, res, next) {
  try {
    const { id } = req.params;
    const data = await database.query()
​
    // Set data to Redis
    redisClient.setex(id, 3600, JSON.stringify(data))

    res.status(200).send(data)
  } catch (err) {
    console.error(err)
    res.status(500)
  }
}
​
function cache (req, res, next) {
  const { id } = req.params
​
  redisClient.get(id, (err, data) => {
    if (err) {
      return res.status(500).send(err)
    }

    // If data exists return the cached value
    if (data != null) {
      return res.status(200).send(data)
    }
​
   // If data does not exist, proceed to the getSomethingFromDatabase function
   next()
  })
}
​
​
app.get('/data/:id', cache, getSomethingFromDatabase)
app.listen(3000, () => console.log(`Server running on Port ${port}`))