To insert embedded document(s) in a collection of a database, you can use collection.insertOne() or collection.insertMany() methods to insert one or multiple documents.

database.collection("sampleCollection").insertOne(firstDocument, function(error, res) {
   if (error) throw error;
   console.log("1 document inserted");
});
database.collection("sampleCollection").insertMany(documents, function(error, res) {
   if (error) throw error;
   console.log("Documents inserted: " + res.insertedCount);
});

Example

Try the following example to insert documents in a mongodb collection −

Copy and paste the following example as mongodb_example.js −

const MongoClient = require(''mongodb'').MongoClient;

// Prepare URL
const url = "mongodb://localhost:27017/";

const firstPost = {
   title : ''MongoDB Overview'',
   description : ''MongoDB is no SQL database'',
   by: ''tutorials point'',
   url: ''http://www.tutorialspoint.com'',
   comments: [{
      user: ''user1'',
      message: ''My First Comment'',
      dateCreated: ''20/2/2020'',
      like: 0
   },
   {
      user: ''user2'',
      message: ''My Second Comment'',
      dateCreated: ''20/2/2020'',
      like: 0
   }]
};
// make a connection to the database
MongoClient.connect(url, function(error, client) {
   if (error) throw error;
   console.log("Connected!");
   // Connect to the database
   const database = client.db(''posts'');     
   database.collection("samplePost").insertOne(firstPost, function(error, res) {
   if (error) throw error;
      console.log("1 document inserted");
   });  
   // close the connection
   client.close();
});

Output

Execute the mysql_example.js script using node and verify the output.

node mongodb_example.js
Connected.
1 document inserted