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저는 아래 방법으로 해결하였습니다.공식 문서에 따르면 Redis 3 버전은 Promise를 지원하지 않는다고 하네요. 따라서 util 라이브러리를 이용하여 문제를 해결해야합니다. (dependencies util 추가)<blockquote>Node Redis currently doesn't natively support promises (this is coming in v4), however you can wrap the methods you want to use with promises using the built-in Node.js <code>util.promisify</code> method on Node.js >= v8;</blockquote><pre class="hljs"><code>const { promisify } = require("util");
const getAsync = promisify(client.get).bind(client);

getAsync.then(console.log).catch(console.error);</code></pre>&nbsp;<pre class="hljs"><code class="language-javascript">const express = require("express");
const redis = require("redis");
const { promisify } = require("util");

//레디스 클라이언트 생성 
const client = redis.createClient({
 host: "redis-server",
 port: 6379
});
const getAsync = promisify(client.get).bind(client);
const setAsync = promisify(client.set).bind(client);

client.on('error',err => console.log('Redis Client Error',err));

const app = express();

app.get('/',async (req,res) => {
 let number = await getAsync('number');
 if (number === null) {
 number = 0;
 }
 res.send("숫자가 1씩 올라갑니다. 숫자: " + (parseInt(number)));
 await setAsync('number', (parseInt(number) + 1))
})

app.listen(8080);
console.log('Server is running');

</code></pre>

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