Cannot conect to redis in Node

Question

I'm trying to create a basic caching app just to test redis. Im using Redis Version: 4.0.6.

First I was getting error clientclosederror: the client is closed.

Then, after reading the docs, I added

let client;
(async ()=> {
 client = redis.createClient()
 await client.connect()
 
})(); 

But now, when trying on Postman, it just hangs, no response is returned

Full Code:

const express = require("express");
const redis = require("redis");
const axios = require('axios')
const app = express();
let client;
(async ()=> {
 client = redis.createClient()
 await client.connect() 
})(); 
app.get('/result', async (req, res) => {
 const searchTerm = req.query.name; 
 try {
 await client.get(searchTerm, async (err, result) => {
 console.log('cached called')
 if (err) throw err;
 if (result) {
 res.status(200).send({
 result: JSON.parse(result),
 message: "data retrieved from the cache"
 });
 }
 else {
 const result = await axios.get(`https://api.agify.io/?name=${searchTerm}`);
 await client.set(searchTerm, JSON.stringify(result.data));
 
 return res.status(200).send({
 result: result.data,
 message: "cache miss"
 });
 }
 })
 } catch (error) {
 console.log('get error', error)
 return res.status(500).send({ message: error.message })
 }
})
app.listen(process.env.PORT || 3000, () => {
 console.log("Node server started");
});

Answer 1

client.get doesn't need a callback function. It's async. My guess is that it's never getting called and thus Express is not returning anything.

Try this instead:

const result = await client.get('foo')
if (result !== null) {
 // it's a hit
} else {
 // it's a miss
}