UnhandledPromiseRejectionWarning: Error: The client is closed in NodeJS and Redis

user_12729401 0
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I'm implementing Access Token and Refresh Token using JWT for login function in NodeJS application. I'm trying to use Redis to store the Refresh Token, but I'm getting the following code :

redis.js

const redis = require('redis');

require('dotenv').config({ path : __dirname + '/../config/env/.env' });

let redisClient;

redisClient = redis.createClient(6379, '127.0.0.1');

module.exports = redisClient;

authRoute.js

'use strict';

const JwtUtil     = require('../../middlewares/jwt-util');
const redisClient = require('../../middlewares/redis');

const authRouter = require('express').Router();

const jwt = new JwtUtil(); 

authRouter.post('/user-token/generate', (req, res, next) => {
    const accessToken = jwt.sign(req.body);

    const refreshToken = jwt.refresh();

    redisClient.set(req.body.id, refreshToken);

    res.status(200).send({
        result : 'success',
        data : {
            accessToken,
            refreshToken
        }
    });
});

module.exports = authRouter;

I have printed several logs, but it seems that redisClient.set(req.body.id, refreshToken); in authRoute.js. There seems to be an error in.

UnhandledPromiseRejectionWarning: Error: The client is closed

(node:24640) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2) (node:24640) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Access Token and Refresh Token are issued normally. Also, the following code doesn't work. I'm not sure how I should rewrite the code. What should I do?

redisClient.on('connection', () => { 
  console.info('Redis connected!');
}

Although I'm using the Windows, I downloaded Redis, performed a ping test, and confirmed that the server is running.

redis node.js javascript
2 Answers

As for now I am able to solve partially to get data, but for set data still not done for redis v4. #redis #v4 # redisv4

app.get('/data',(req,res) => {
     // check in redis first
    //console.log(">>>>url",url)
    (async () => {
        const userInput = (req.query.country).trim()
        const url = `https://en.wikipedia.org/w/api.php?action=parse&format=json&section=0&page=${userInput}`
   
        const client = createClient({
            host:'localhost',
        port:6379});
      
        client.on('error', (err) => console.log('Redis Client Error', err));
      
        await client.connect();

        const response = await  client.get(`${userInput}`)
        if(response){
            const output = JSON.parse(response);
            res.send(output)
        }
      })();

})
user_36872510

I implement connect to redis v6.2 this way in index.js start file.

const redis = require('redis');

const redisCache = createClient({
  url: redis://localhost:6379    
});
redisClient.on('connect', () => console.log('Connected to Redis!'));
redisClient.on('error', (err) => console.log('Redis Client Error', err));
redisClient.connect();

module.exports = redisClient;
user_130379940
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