If you are developing API or pages in NodeJS and Using the database MongoDb as storage, here is the example which gives you a getting started code to manage data in MongoDB database from NodeJs code. We will use MongooseJS library, which will work as a Database Layer to communicate with MongoDb. This library has all the required functionality for developing Production-ready applications. We are using ExpressJS to create the routes and to create server-side requests handler.
Here, we are taking the example of books API where we want to create the CRUD operations.
Here is the schema for book entity:
const mongoose=require("mongoose");
const book=mongoose.Schema({
title:{
type:String,
require:true
},
author:{
type:String,
require:true
},
pages:{
type:Number,
require:true
},
active:Boolean
});
module.exports=mongoose.model("books",book);
And using the above book schema, we can define the CRUD operations easily.
const ex = require("express");
const {route} = require("express/lib/application");
const book = require("../model/book");
const router = ex.Router();
//get all the books
router.get("/", async (req, resp) => {
try {
const books = await book.find()
resp.json(books);
} catch (err) {
resp.json(err);
}
});
//get single book
router.get("/:bookId", async (req, resp) => {
const bookId = req.params.bookId;
try {
const c = await book.findById(bookId);
resp.json(c);
} catch (error) {
resp.json(error);
}
});
//create book
router.post("/", async (req, resp) => {
const bookPost = await book.create(req.body);
console.log("book details return" + bookPost);
resp.json(bookPost);
});
//delete book
router.delete("/:bookId", async (req, resp) => {
try {
console.log("book id--" + req.params.bookId);
await book.deleteOne({
"_id": req.params.bookId
});
resp.status(200).json({
message: "done",
});
} catch (error) {
resp.json(error);
}
});
//update book
router.put("/:bookId", async (req, resp) => {
const bookId = req.params.bookId;
console.log("bookId " + bookId);
try {
const c= await book.updateOne(
{
"_id": bookId
},
req.body
)
console.log("book details" + c);
resp.json(c)
} catch (error) {
resp.json(error);
}
});
module.exports = router;
In .env file you can. declare the PORT and Database connection String.
PORT=2000 DB_CONNECTION_URL=mongodb://localhost:27017/test
After running the above APIs, you can see the data in the database.
And final index.js from where everything would start.
const mongoose=require("mongoose");
const express=require("express");
const booksRouter=require("./routes/books");
const app=express();
const bodyParser=require("body-parser");
app.use(bodyParser.json());
app.use("/api/v1/books",booksRouter);
require("dotenv").config()
mongoose.connect(process.env.DB_CONNECTION_URL);
app.listen(process.env.PORT, ()=>{
console.log("server is running");
});
