How to replace one document in MongoDB using Node.js ?

MongoDB, the most popular NoSQL database, we can count the number of documents in MongoDB Collection using the MongoDB collection.countDocuments() function. The mongodb module is used for connecting the MongoDB database as well as used for manipulating the collections and databases in MongoDB. 

Installing module: You can install mongodb module using the following command. 

npm install mongodb

Project Structure:

Running the server on Local IP: Data is the directory where MongoDB server is present.

mongod --dbpath=data --bind_ip 127.0.0.1

MongoDB Database:

Database:GFG
Collection:aayush

Following is the sample data stored in your database for this example.

Filename: index.js

// Requiring module
const MongoClient = require("mongodb"); 

// Connection URL
const url = 'mongodb://localhost:27017/'; 

// Database name
const databasename = "GFG";
 
MongoClient.connect(url).then((client) => { 
   const connect = client.db(databasename); 

   // Connect to collection 
   const collection = connect .collection("aayush"); 

   // Replacing document with our match condition
   collection.replaceOne({name:"aayush"},
   {name:"aayushsaini"}).then((ans) => {
       console.log("Successful");
   }).then((err) => {
       console.log(err);
   })     
}).catch((err) => { 
   // Printing the error message 
   console.log(err.Message); 
})

Run index.js file using the following command:

node index.js

Output:

Following is our updated database after executing the above command.