react app

backend/Dockerfile

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+# Use the official Node.js 20 image as the base image
+FROM node:20
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the package.json and package-lock.json files to the container
+COPY package*.json ./
+
+# Install the dependencies
+RUN npm install
+
+# Copy the rest of the application's source code to the container
+COPY . .
+
+# Expose the port that the application listens on
+EXPOSE 3000
+
+# Start the Node.js application
+CMD [ "npm", "start" ]

backend/package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.20.2",
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "mysql2": "^3.4.5",
+    "nodemon": "^2.0.22"
+  }
+}

backend/server.js

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+const express = require("express");
+const mysql = require("mysql2");
+var cors = require("cors");
+const bodyParser = require("body-parser");
+
+// Create the Express app
+const app = express();
+app.use(cors());
+app.use(bodyParser.json());
+
+// Create a connection to the MySQL database
+const mysqlConfig = {
+  host: process.env.DB_HOST || "db",
+  port: process.env.DB_PORT || "3306",
+  user: process.env.DB_USER || "root",
+  password: process.env.DB_PASSWORD || "pass123",
+  database: process.env.DB_NAME || "appdb",
+};
+
+let con = null;
+const databaseInit = () => {
+  con = mysql.createConnection(mysqlConfig);
+  con.connect((err) => {
+    if (err) {
+      console.error("Error connecting to the database: ", err);
+      return;
+    }
+    console.log("Connected to the database");
+  });
+};
+
+const createDatabase = () => {
+  con.query("CREATE DATABASE IF NOT EXISTS appdb", (err, results) => {
+    if (err) {
+      console.error(err);
+      return;
+    }
+    console.log("Database created successfully");
+  });
+};
+
+const createTable = () => {
+  con.query(
+    "CREATE TABLE IF NOT EXISTS apptb (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255))",
+    (err, results) => {
+      if (err) {
+        console.error(err);
+        return;
+      }
+      console.log("Table created successfully");
+    }
+  );
+};
+
+// GET request
+app.get("/user", (req, res) => {
+  databaseInit();
+  con.query("SELECT * FROM apptb", (err, results) => {
+    if (err) {
+      console.error(err);
+      res.status(500).send("Error retrieving data from database");
+    } else {
+      res.json(results);
+    }
+  });
+});
+
+// POST request
+app.post("/user", (req, res) => {
+  con.query(
+    "INSERT INTO apptb (name) VALUES (?)",
+    [req.body.data],
+    (err, results) => {
+      if (err) {
+        console.error(err);
+        res.status(500).send("Error retrieving data from database");
+      } else {
+        res.json(results);
+      }
+    }
+  );
+});
+
+app.post("/dbinit", (req, res) => {
+  databaseInit();
+  createDatabase();
+  res.json("Database created successfully");
+});
+
+app.post("/tbinit", (req, res) => {
+  databaseInit();
+  createTable();
+  res.json("Table created successfully");
+});
+
+// Start the server
+app.listen(3000, () => {
+  console.log("Server running on port 3000");
+});