final commit

backend/.gitignore

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+node_modules/
+
+.env

backend/cardRouter.js

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+const express = require("express");
+const Card = require("./db");
+const router = express.Router();
+
+router.post("/cards", async (req, res) => {
+  try {
+    let { title, description } = req.body;
+
+    // check if both title and description are present
+    if (!title || !description) {
+      return res.status(400).json({
+        message: "Title and description are required",
+      });
+    }
+    const cardExists = await Card.findOne({ title }); //check if card with same title does not exist already
+    if (cardExists) {
+      return res.status(400).json({
+        message: "Card already exists",
+      });
+    }
+    //create the card
+    await Card.create({
+      title,
+      description,
+    });
+    res.status(200).json({
+      message: "Card Created Successfully",
+    });
+  } catch (error) {
+    res.status(500).json({
+      message: "Internal server Error",
+    });
+  }
+});
+
+router.get("/cards", async (req, res) => {
+  try {
+    const cards = await Card.find({});
+    if (cards.length === 0) {
+      return res.status(200).json({
+        message: "No cards found",
+      });
+    }
+    res.status(200).json({
+      cards: cards,
+    });
+  } catch (error) {
+    res.status(500).json({
+      message: "Internal Server Error",
+    });
+  }
+});
+
+router.get("/cards/:title", async (req, res) => {
+  try {
+    const title = req.params.title;
+    console.log(title);
+    const card = await Card.findOne({ title });
+
+    if (!card) {
+      return res.status(404).json({
+        message: "Card not found",
+      });
+    }
+
+    res.status(200).json({
+      card: card,
+    });
+  } catch (error) {
+    res.status(500).json({
+      message: "Internal Server Error",
+    });
+  }
+});
+
+module.exports = router;

backend/db.js

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+const mongoose = require("mongoose");
+require("dotenv").config();
+
+mongoose
+  .connect(`${process.env.MONGODB_URL}`)
+  .then(() => {
+    console.log("Connected to DB");
+  })
+  .catch((err) => {
+    console.error("Error connecting to DB:", err);
+  });
+
+const cardSchema = new mongoose.Schema({
+  title: {
+    type: String,
+    required: true,
+    unique: true,
+  },
+  description: {
+    type: String,
+    required: true,
+  },
+});
+
+
+
+const Card = new mongoose.model("Card", cardSchema);
+
+module.exports = Card;

backend/index.js

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+const express = require("express");
+const cors = require("cors");
+const cardRouter = require("./cardRouter");
+require("dotenv").config();
+
+const app = express();
+app.use(express.json());
+app.use(cors());
+
+app.use("/", cardRouter);
+
+const PORT = process.env.PORT || 3000;
+
+app.listen(PORT, () => {
+  console.log("The server is Up and Running on PORT:" + PORT);
+});