Node-Redis: ready check failed - NOAUTH Authentication required - node.js

Question

I have a strange redis behavior:
const redis = require('redis');
const { REDIS_URL: redisUrl, REDIS_PASSWORD: redisPassword } = process.env;
const client = redis.createClient(redisUrl, {
no_ready_check: true,
auth_pass: redisPassword
});
client.on('connect', () => {
redisPassword && client.auth(redisPassword);
});
client.on('error', err => {
global.console.log(err.message)
});
But all the time I receive following error:
throw er; // Unhandled 'error' event
ReplyError: Ready check failed: NOAUTH Authentication required.
Why unhandled ? I set onerror handler
Why Ready check failed ? I disabled it in options

Answer 1

I'm not sure why your code will throw this error. But I try this code in my local machine, it works well.
const redis = require('redis');
const redisPassword = "password" ;
const client = redis.createClient({
host : '127.0.0.1',
no_ready_check: true,
auth_pass: redisPassword,
});
client.on('connect', () => {
global.console.log("connected");
});
client.on('error', err => {
global.console.log(err.message)
});
client.set("foo", 'bar');
client.get("foo", function (err, reply) {
global.console.log(reply.toString())
})
And run node client.js will output :
connected
bar
NOAUTH Authentication required is caused by when redis process command , it found the client is not authenticated so it complained with it.
I guess maybe the redisUrl you give to createClient has some problem, try to debug it or change to my code's way to try. Hopefully you can fix it.
And one more thing: the client.auth(redisPassword) is not necessary because if you set an auth_pass or password option, the redis client will auto send auth command to server before any command.

Answer 2

If you have redis uri saved as string. You need decompose it to object. For ioredis you can use function
export function decomposeRedisUrl(url) {
const [[, , password, host, port]] = [...(url.matchAll(/redis:\/\/(([^#]*)#)?(.*?):(\d*)/g))];
return { password, host, port };
}
There are tests for this function:
it("redis url should be decomposed correctly with password", () => {
expect(decomposeRedisUrl("redis://pass#host.com:9183")).to.eql({
password: "pass",
host: "host.com",
port: "9183",
});
});
it("redis url should be decomposed correctly without password", () => {
expect(decomposeRedisUrl("redis://localhost:6379")).to.eql({
password: undefined,
host: "localhost",
port: "6379",
});
});
and usage
import Redis from "ioredis";
async function getKeysFromRedisUrl(url) {
const rc = new Redis(decomposeRedisUrl(url));
const keys = await rc.keys("*");
rc.disconnect();
return keys;
}
describe("Redis can connect", () => {
it("with cloud", async () => {
expect(await getKeysFromRedisUrl("redis://pass#host.com:9183")).to.be.an("array");
});
it("with local redis instance", async () => {
expect(await getKeysFromRedisUrl("redis://localhost:6379")).to.be.an("array");
});
});
user name is not handled in this function

Answer 3

if you're using docker to run Redis, check if your docker-compose has the command: redis-server --requirepass redis
Then check your .env file to make sure you're using it.
It was the problem here and I was able to fix it by adding the password at .env file.