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Building Scalable Apps: Redis Implementation with Node.js

Build an API with Node.js and a Redis Client

Explore how to connect Redis with Node.js by creating a Redis client instance using the redis package. Learn to build an asynchronous API that performs key operations like set, get, and keys. Understand how to integrate Redis operations within Express.js routes and handle common API implementation pitfalls.

We'll cover the following...

Connect Redis using Node.js

To recap, we’ve discussed a lot of Redis commands to perform multiple operations on strings, lists, sets, and transactions. Till now, we’ve executed the commands on the terminal, but in reality, we’ll use Redis with our applications where we need to connect and execute the commands using Node.js.

We’ll use an npm package, redis, that will help our Node.js applications to connect with Redis and perform different operations with it. For now, we’ll only focus on how to connect with Redis using the redis package. The most important step to connect to the Redis server is to create a Redis client instance that will be used to communicate and execute all the Redis commands from our Node.js code. We’ll use the createClient() function to create a Redis client object. We can pass different parameters to this function to customize its behavior, such as specifying a different host, port, or password for the Redis server. An example is shown below:

const redis = require("redis");



const client = redis.createClient({

  host: 'my.redis.server.com',

  port: 6379,

  password: 'myredispassword'

});
Connecting to a remote Redis server

For now, we’ll go ahead with the default parameters that will connect the Redis server on localhost:6379, which is the Redis server running on localhost and at the default ...

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// Importing the required package
const redis = require("redis");
// Creating a Redis client object
const client = redis.createClient();
// An immediately invoked function expression to execute an async function as soon as it is defined
(async () => {
  await client.connect();
})();
// Add event listener on the Redis client and log the error message
client.on("error", (err) => {
  console.log("Error " + err);
});
// Add an event listener on the Redis client once it is ready to accept the request, 
// log the message and disconnect with Redis client to stop execution of the code
client.on("ready", async () => {
  console.log("Connected!")
  await client.quit();
});
...