REST API with Express and MongoDB

Creating a CRUD Rest Api example Express MongoDb:

 Step1: Creating application folder and application structure.:

 Step 2: Install required dependencies by using npm install < dependencies> --save command.

 Step 3: create app folder structure compatible with MVC structure as shown below.

 Package.json file should be like this:

 "scripts": { "start": "nodemon app.js" },

 "author": "", 

 "license": "ISC", 

 "dependencies": {

             "express": "^4.17.1", "mongoose": "^6.0.11", "nodemon": "^2.0.13" } }

 In app.js file write the code for the server: 

 const express = require('express'); 

const app = express(); 

const mongoose = require('mongoose'); 

 app.use(express.json()); // 

import routes const postRoute= require('./routes/posts'); 

app.use('/posts',postRoute); 

 //Routes // listening 

mongoose.connect("mongodb://localhost:27017/myowndb",() =>{ console.log("Connected to DB"); });

 app.listen(3000);  

In models/post.js file code: 

const mongoose = require('mongoose'); 

 const PostSchema= mongoose.Schema({ title:{ type:String, required:true, },

 description:{ type:String, required:true }, date:{ type:Date, default:Date.now } });

 module.exports=mongoose.model('Posts',PostSchema); 

 In routes/ posts.js file  code:

const express= require('express'); 

const router= express.Router();

 const Post= require('../models/post'); 

 // getting all posts router.get('/', async(req,res) =>{ try{ const posts = await Post.find(); res.json(posts);

 }catch (err){ res.json({message:err}); } });

 // getting a post by id

 router.get('/:postid', async(req,res) =>{ try{ const post = await Post.findById(req.params.postid); res.json(post); }catch(err){ res.json({message:err}); } })

 // creating a post

 router.post('/',(req,res)=>{ const post =new Post({ title:req.body.title, description:req.body.description }); post.save(). then(data =>{ res.json(data); }).catch (err=>{ res.json({message:err}); }) }); 

 // deleting a post

 router.delete('/:postid', async(req,res) =>{ try{ const removepost = await Post.deleteOne({_id: req.params.postid}); res.json(removepost); }catch(err){ res.json({message:err}); } } ); 

// updating a post by id

 router.patch('/:postid', async(req,res) =>{ try{ const editpost = await Post.updateOne({_id: req.params.postid}); res.json(editpost); }catch(err){ res.json({message:err}); } });

 module.exports= router;