Using Redis with NodeJS

To use Redis with NodeJS is more simple. In this example, we will use Docker to obtain an instance of Redis. Follow the example:

First of all, pull the docker image for redis:

docker pull redis

After that, start image given a name:

docker start redis7

Now, we will create a new node project:

npm init -y

The next step is to add the redis dependencies:

npm install redis

Now, it is time to code. Create a new file, import redis and create a client redis object:

const redis = require('redis')

const clientRedis = redis.createClient(process.env.REDIS_URL)

clientRedis.on('connect', () => {
    console.log(`Server connected with redis`)
});

clientRedis.on('error', err => {
    console.log(`Server redis with error: ${err}`)
});

In the code above we created a redis client and started the server. One important thing is the url of redis. In my case, I’m using an environment variable. To setup the variable in linux, for instance, we can run the following:

 export REDIS_URL="redis://127.0.0.1:6379"

The default port is 6379, and in this case, the redis is in a docker instance.

Finally, just get and set content in redis:

clientRedis.get(args, function(err, data) {
    if (data) {
        return response.send(data)
    }
})

clientRedis.setex(url, 3600, JSON.stringify(someData))//3600 is when data will expires

and that’s all folks!

If you have any doubts, problems or suggestions, just leave a message.