How to use Redis with NodeJS to get all the users from DB

Question

I'm trying to implement Redis inside my NodeJS API but having issues to do so. What I try is to make Redis for the endpoint which serves all the users as a response. I'm getting this error from my implementationnode_redis:

The GET command contains a invalid argument type of \"undefined\".\nOnly strings, dates and buffers are accepted. Please update your code to use valid argument types.:

I tried in this way from connection to middleware:

import redis from 'redis';
import { redisConfig } from '../config';
import Logger from './logger';
// Redis default port === 6379
const REDIS_PORT = redisConfig.port || 6379;
// Connect to redis
const client = redis.createClient(REDIS_PORT);
// Check connection
client.on('connect', () => {
 Logger.info('Connected to Redis');
});
client.on('error', () => {
 Logger.error('Redis not connected');
});
export default client;

Then using this above in my controller:

import Client from '../loaders/redis';
const UserController = {
 async getAllUsers(req, res, next) {
 try {
 const users = await DB.User.find({});
 if (!users) {
 Logger.error('User was not found');
 return res.status(404).send('Nothing found');
 }
 // Set users to redis
 await Client.setex(users, 3600, users);
 Logger.info('All the users were found');
 return res.status(200).send(users);
 } catch (err) {
 Logger.error(err);
 return next(err);
 }
 },}

The middleware:

import Client from '../loaders/redis';
// Cache middleware
const cache = (req, res, next) => {
 const { users } = res;
 Client.get(users, (error, cachedData) => {
 if (error) throw error;
 if (cachedData != null) {
 res.send(users, cachedData);
 } else {
 next();
 }
 });
};
export default cache;

The route:

import Controller from '../controllers';
import cache from '../middleware/cacheMiddle';
app.get('/users', cache, Controller.UserCtrl.getAllUsers);

I cannot understand how to use it as I want to adopt Redis to bee able to get the users faster and also I don't know if make sense and also how to do it for the post of a user for example.

• Adam Coster: It looks like users is an array of values. The redis get method only takes individual keys (e.g. one user). If you're trying to scan redis to get a bunch of things back you'll need to use different functions. This other question might help: stackoverflow.com/questions/30728973/…
• Jakub: I would like to see an example in my codes as I cannot understand how I should I do that, please