Here's a detailed tutorial for Building a Real-Time Analytics Dashboard with Node.js, WebSocket, and Redis:
Setup Node.js and Redis:
- First, make sure you have Node.js and Redis installed on your machine. You can download Node.js from the official website (https://nodejs.org/en/) and Redis from the official website (https://redis.io/download).
Create a new Node.js project:
Open a terminal and create a new directory for your project.
Navigate to the directory and run the following command to create a new Node.js project:
csharpnpm init -y
Install Dependencies:
Run the following command to install dependencies:
luanpm install express redis socket.io
This installs the express, redis, and socket.io packages which we will use to create the real-time analytics dashboard.
Create a new Redis client:
Open the
app.js
file and add the following code to create a new Redis client:javascriptconst redis = require('redis'); const client = redis.createClient(); client.on('connect', function() { console.log('Connected to Redis...'); }); client.on('error', function(err) { console.log('Error: ' + err); });
This code creates a new Redis client and logs a message to the console when the client is connected to the Redis server.
Create a new WebSocket server:
Add the following code to create a new WebSocket server:
javascriptconst server = require('http').createServer(); const io = require('socket.io')(server); io.on('connection', function(socket) { console.log('User connected...'); socket.on('disconnect', function() { console.log('User disconnected...'); }); }); server.listen(3000, function() { console.log('WebSocket server listening on port 3000...'); });
This code creates a new WebSocket server and logs a message to the console when a user connects or disconnects from the server.
Send real-time data to the dashboard:
In the
app.js
file, add the following code to send real-time data to the dashboard:javascriptsetInterval(function() { const data = { timestamp: new Date().getTime(), value: Math.floor(Math.random() * 100) }; client.lpush('data', JSON.stringify(data), function(err, reply) { client.ltrim('data', 0, 99); }); io.emit('data', data); }, 1000);
This code sends real-time data to the dashboard every second.
The data is stored in Redis using the
lpush
command and is trimmed to the most recent 100 entries using theltrim
command.The data is then sent to the dashboard using the
emit
method of the WebSocket server.
Create the dashboard:
Create a new file called
index.html
in the project directory.Add the following code to create the dashboard:
php<!DOCTYPE html> <html> <head> <title>Real-Time Analytics Dashboard</title> </head> <body> <h1>Real-Time Analytics Dashboard</h1> <div id="chart"></div> <script src="/socket.io/socket.io.js"></script> <script src="https://cdn.jsdelivr.net/npm/apexcharts"></script> <script> const socket = io(); const chart = new ApexCharts(document.querySelector('#chart'), { series
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