MONGOSHELL with POSTMAN

Follow the Following Steps (For Windows)

• windows + R

• Enter Cmd

• Opens the command prompt/terminal

For Linux & Mac Please follow the guide from Mongodb https://www.mongodb.com/docs/mongodb-shell/run-commands/

type mongosh

show databases

use merndb

show collections

db.users.find()

dont worry about these datas we can insert them later its just for the purpose of the particular command used in the mongo shell

Now lets start coding

Make sure to create your project in this manner

We Only need 4 javascript files to make this work server.js,.env,userRoute.js,userModel.js

/////////////////////////SCRIPT JS///////////////////////////////
const express = require("express");
const app = express();
const dotenv = require("dotenv");
const mongoose = require("mongoose");
const cors = require("cors");
dotenv.config();

app.use(cors());

const userDataRoute = require("./Routes/userRoute");

app.use(express.json());



//Connect to mongodb database(locally)
mongoose
  .connect(process.env.URI)
  .then(() => {
    console.log("Connected Successfully");
    app.listen(process.env.PORT || 3000, (err) => {
      if (err) console.log(err);
      console.log(`running at port ${process.env.PORT}`);
    });
  })
  .catch((error) => console.log("Failed to connect", error));

app.use(userDataRoute);

/////////////////////////.env//////////////////////////////

PORT = 3000
URI = mongodb://127.0.0.1:27017/merndb

////////////////////////userRoute js///////////////////////
const express = require("express");
const mongoose = require("mongoose");
const User = require("../models/userModel"); // Adjust the path as needed

const router = express.Router();

// Create
router.post("/", async (req, res) => {
  const { name, email, age } = req.body;

  try {
    const userData = await User.create({
      name,
      email,
      age,
    });
    res.status(201).json(userData);
  } catch (error) {
    if (error.name === 'ValidationError') {
      // Mongoose validation error
      const validationErrors = Object.values(error.errors).map((err) => err.message);
      res.status(400).json({ error: 'Validation failed', details: validationErrors });
    } else {
      console.error(error);
      res.status(500).json({ error: 'Internal server error' });
    }
  }
});

// Get
router.get("/", async (req, res) => {
  try {
    const showAll = await User.find();
    // Your code to retrieve data from MongoDB or perform other operations
    res.status(200).json(showAll);
  } catch (error) {
    console.error(error);
    res.status(500).json({ error: "Internal server error" });
  }
});

//Get Single User
router.get("/:id", async (req, res) => {

    const {id} = req.params;
    try {
      const singleUser = await User.findById({_id : id});
      // Your code to retrieve data from MongoDB or perform other operations
      res.status(200).json(singleUser);
    } catch (error) {
      console.error(error);
      res.status(500).json({ error: "Internal server error" });
    }
  });


 //Delete
 router.delete("/:id", async (req, res) => {

    const {id} = req.params;
    try {
      const singleUser = await User.findByIdAndDelete({_id : id});
      // Your code to retrieve data from MongoDB or perform other operations
      res.status(200).json(singleUser);
    } catch (error) {
      console.error(error);
      res.status(500).json({ error: "Internal server error" });
    }
  });

  // Update
router.patch("/:id", async (req, res) => {
    const { id } = req.params;
    const { name, email, age } = req.body;

    try {
      const updatedUser = await User.findByIdAndUpdate(
        id,
        { name, email, age },
        { new: true }
      );

      // Check if the user with the specified ID exists
      if (!updatedUser) {
        return res.status(404).json({ error: "User not found" });
      }

      // Your code to retrieve data from MongoDB or perform other operations
      res.status(200).json(updatedUser);
    } catch (error) {
      console.error(error);
      res.status(500).json({ error: "Internal server error" });
    }
  });





module.exports = router;
//////////////////////////userModel js///////////////////////

const mongoose = require("mongoose");

//create scehma
const userScehma = new mongoose.Schema({
    name:{
        type: String,
        required: true
    },
    email : {
        type: String,
        unique: true,
        required: true,
    },
    age : {
        type: Number,
        required: false,
    },

},
{ timestamps: true }
);

//create Model
const User = mongoose.model('User', userScehma)
module.exports = User;