Below is a simple implementation using MongoDB with Node.js and Express.js.
1. Setting Up the Blog App
Install Dependencies
npm init -y
npm install express mongoose body-parser cors
Express.js: Web framework for Node.js.
Mongoose: ODM (Object Data Modeling) for MongoDB.
Body-parser: Middleware for handling request data.
CORS: Allows API requests from different origins.
2. Connecting to MongoDB
Create a file server.js and set up MongoDB connection:
const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const cors = require("cors");
const app = express();
app.use(bodyParser.json());
app.use(cors());
// Connect to MongoDB
mongoose
.connect("mongodb://127.0.0.1:27017/blogDB", { useNewUrlParser: true, useUnifiedTopology: true })
.then(() => console.log("MongoDB connected"))
.catch((err) => console.log(err));
// Define the Blog Schema
const blogSchema = new mongoose.Schema({
title: String,
content: String,
author: String,
createdAt: { type: Date, default: Date.now },
});
const Blog = mongoose.model("Blog", blogSchema);
3. Implementing CRUD Operations
(1) Create a Blog Post (C - Create)
app.post("/blogs", async (req, res) => {
try {
const { title, content, author } = req.body;
const newPost = new Blog({ title, content, author });
await newPost.save();
res.status(201).json(newPost);
} catch (err) {
res.status(500).json({ message: err.message });
}
});
(2) Read All Blog Posts (R - Read)
app.get("/blogs", async (req, res) => {
try {
const posts = await Blog.find();
res.status(200).json(posts);
} catch (err) {
res.status(500).json({ message: err.message });
}
});
(3) Read a Single Blog Post by ID
app.get("/blogs/:id", async (req, res) => {
try {
const post = await Blog.findById(req.params.id);
if (!post) return res.status(404).json({ message: "Post not found" });
res.status(200).json(post);
} catch (err) {
res.status(500).json({ message: err.message });
}
});
(4) Update a Blog Post (U - Update)
app.put("/blogs/:id", async (req, res) => {
try {
const updatedPost = await Blog.findByIdAndUpdate(req.params.id, req.body, { new: true });
if (!updatedPost) return res.status(404).json({ message: "Post not found" });
res.status(200).json(updatedPost);
} catch (err) {
res.status(500).json({ message: err.message });
}
});
(5) Delete a Blog Post (D - Delete)
app.delete("/blogs/:id", async (req, res) => {
try {
const deletedPost = await Blog.findByIdAndDelete(req.params.id);
if (!deletedPost) return res.status(404).json({ message: "Post not found" });
res.status(200).json({ message: "Post deleted successfully" });
} catch (err) {
res.status(500).json({ message: err.message });
}
});
4. Starting the Server
Add the following at the end of server.js:
const PORT = 5000;
app.listen(PORT, () => console.log(`Server running on port ${PORT}`));
Start the server:
node server.js
