Back end development

node and Express Framework

Nowadays day tech is growing as fast as much speed of light

here we are for the basic CRUD operation Using MongoDB as a back-end node and Express as a Framework of back-end tech.

if you are reading or searching about this blog then you are a beginner in the Back end lest Deep dive into Backend code.

some basic Structure: of the controller :

this controller is used for Query or logic part in the controller function here are examples for controller

example of a controller for basic getting data and creating data

const getAllTasks = async (req, res) => { try { const getAlldata = await Task.find({}); res.status(200).json({ getAlldata });

res.status(200).json({ status: "success", data: { getAlldata, nbHits: getAlldata.length }, }); } catch (error) { res.status(500).json({ meg: Server error try again please${error} }); } };

const createTasks = async (req, res) => { try { const task = await Task.create(req.body); res.status(201).json({ task }); } catch (error) { res.status(500).json({ meg: error }); } };

as well as u can also design controller as you want for deleteTasks, updateTasks getSingleTasks, ae well

module.exports = { getAllTasks, deleteTasks, updateTasks, getSingleTasks, createTasks, };

2. then we have to import a controller in the routes.js file and things go well

const express = require("express"); // express router setup here const router = express.Router();

const { getAllTasks, deleteTasks, updateTasks, getSingleTasks, createTasks, } = require("../controllers/TaskControler");

router.route("/").get(getAllTasks).post(createTasks) router.route('/:id').get(getSingleTasks).patch(updateTasks).delete(deleteTasks)

module.exports = router;

3. Basic Schema for data Base for more detail can visit https://mongoosejs.com/

const mongoose = require("mongoose");

const taskSchema = mongoose.Schema({ name: { type: String, required: [true, "must provide name "], trim: true, maxlength: [20, "name can not more then 20 characters"], }, completed: { type: Boolean, default: false, }, });

module.exports = mongoose.model("Task", taskSchema);

4. DB connection Note you have to create a .env file for DB connection for Production Grad back-end Development

const mongoose = require("mongoose");

const connectDb = (url) => { return mongoose.connect(url); };

module.exports = connectDb;

5. all the sum up for the file in app.js or index.js file so here we are Backend app.js

//express initinalized const express = require("express"); const app = express(); const routes = require("./routes/routes"); var bodyParser = require("body-parser"); const connectDb = require("./db/connect"); //! DB CONNECTION

require("dotenv").config(); //! ENV SET UP

app.use(bodyParser.urlencoded({ extended: true })); app.use(bodyParser.json()); app.use("/api/V1/routes", routes);

//basic port declaration const port = process.env.PORT || 3737;

const start = async () => { try { await connectDb(process.env.MONGO_URI); app.listen(port, console.log(app listen on port no ${port})); console.log("connected : SERVER AND DATA BASE"); } catch (error) { console.log("CONNECTION ERROR", error); } };

start();

6 "dependencies"

this dependency requires the Backend

"dependencies": {
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "mongoose": "^8.4.5",
    "nodemon": "^3.1.4"
 }

above are just an overview of the back-end function and code for more details about this basic crud operation visit my GitHub repository https://github.com/mehulpandya096/mehulpandya096-CRUD-API-Node.js-Express-and-MongoDB for more Basic Project https://github.com/mehulpandya096