Connection examples

Use the same connection URI from Connect your application in your code. The examples below show how to connect and run a simple operation with the official MongoDB drivers for Node.js, Python, and Go. Replace the URI with your own (host, username, password, and options such as ssl=false or replicaSet=rs0 as needed).

Node.js

Use the MongoDB Node.js driver. Install it with:

npm install mongodb

Example: connect and insert one document.

const { MongoClient } = require("mongodb");

const uri = "mongodb://myuser:mypassword@my-cluster-name-mongos.default.svc.cluster.local/admin?ssl=false";

async function run() {
  const client = new MongoClient(uri);
  try {
    await client.connect();
    const db = client.db("mydb");
    const result = await db.collection("items").insertOne({ name: "example", value: 1 });
    console.log("Inserted id:", result.insertedId);
  } finally {
    await client.close();
  }
}

run().catch(console.error);

For replica set URI use the same pattern with a URI like mongodb://...@my-cluster-name-rs0.<namespace>.svc.cluster.local/admin?replicaSet=rs0&ssl=false. The driver handles failover and reconnection when you use a replica set URI.

Python

Use PyMongo. Install it with:

pip install pymongo

Example: connect and insert one document.

from pymongo import MongoClient

uri = "mongodb://myuser:mypassword@my-cluster-name-mongos.default.svc.cluster.local/admin?ssl=false"

client = MongoClient(uri)
try:
    db = client.mydb
    result = db.items.insert_one({"name": "example", "value": 1})
    print("Inserted id:", result.inserted_id)
finally:
    client.close()

Use the same URI format as in Connect your application. For replica set, include replicaSet=rs0 in the URI; PyMongo will discover members and handle failover.

Go

Use the MongoDB Go driver. Add the module:

go get go.mongodb.org/mongo-driver/mongo

Example: connect and insert one document.

package main

import (
    "context"
    "fmt"
    "log"

    "go.mongodb.org/mongo-driver/bson"
    "go.mongodb.org/mongo-driver/mongo"
    "go.mongodb.org/mongo-driver/mongo/options"
)

func main() {
    uri := "mongodb://myuser:mypassword@my-cluster-name-mongos.default.svc.cluster.local/admin?ssl=false"

    client, err := mongo.Connect(context.Background(), options.Client().ApplyURI(uri))
    if err != nil {
        log.Fatal(err)
    }
    defer func() { _ = client.Disconnect(context.Background()) }()

    coll := client.Database("mydb").Collection("items")
    result, err := coll.InsertOne(context.Background(), bson.M{"name": "example", "value": 1})
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Inserted id:", result.InsertedID)
}

Use the same URI for replica set (with replicaSet=rs0); the driver handles replica set discovery and reconnection.

Next steps

App configuration best practices

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Last update: March 23, 2026
Created: March 23, 2026