.NET Aspire MongoDB database integration

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In this article, you learn how to use the .NET Aspire MongoDB database integration. The Aspire.MongoDB.Driver library:

  • Registers a IMongoClient in the DI container for connecting to a MongoDB database.
  • Automatically configures the following:
    • Health checks, logging and telemetry to improve app monitoring and diagnostics
  • It supports both a local MongoDB Database and a MongoDB Atlas database deployed in the cloud.

Prerequisites

  • MongoDB database and connection string for accessing the database.

Get started

To get started with the .NET Aspire MongoDB database integration, install the Aspire.MongoDB.Driver NuGet package in the client-consuming project, i.e., the project for the application that uses the MongoDB database client.

dotnet add package Aspire.MongoDB.Driver

For more information, see dotnet add package or Manage package dependencies in .NET applications.

Example usage

In the Program.cs file of your client-consuming project, call the AddMongoDBClient extension to register a IMongoClient for use via the dependency injection container.

builder.AddMongoDBClient("mongodb");

To retrieve your IMongoClient object, consider the following example service:

public class ExampleService(IMongoClient mongoClient)
{
    // Use mongoClient...
}

After adding a IMongoClient, you can require the IMongoClient instance using DI.

App host usage

To model the MongoDB resource in the app host, install the Aspire.Hosting.MongoDB NuGet package in the app host project.

dotnet add package Aspire.Hosting.MongoDB

In your app host project, register the MongoDB database and consume the connection method and consume the service using the following methods:

var builder = DistributedApplication.CreateBuilder(args);

var mongo = builder.AddMongoDB("mongo");
var mongodb = mongo.AddDatabase("mongodb");

var myService = builder.AddProject<Projects.MyService>()
                       .WithReference(mongodb);

If using MongoDB Atlas, you don't need the call to .AddDatabase("mongodb"); as the database creation will automatically be handled by Atlas.

Configuration

The .NET Aspire MongoDB database integration provides multiple configuration approaches and options to meet the requirements and conventions of your project.

Use a connection string

When using a connection string from the ConnectionStrings configuration section, you can provide the name of the connection string when calling builder.AddMongoDBClient():

builder.AddMongoDBClient("MongoConnection");

And then the connection string will be retrieved from the ConnectionStrings configuration section:

Consider the following MongoDB example JSON configuration:

{
  "ConnectionStrings": {
    "MongoConnection": "mongodb://server:port/test",
  }
}

Consider the following MongoDB Atlas example JSON configuration:

{
  "ConnectionStrings": {
    "MongoConnection": "mongodb+srv://username:password@server.mongodb.net/",
  }
}

For more information on how to format this connection string, see MongoDB: ConnectionString documentation.

Use configuration providers

The .NET Aspire MongoDB database integration supports Microsoft.Extensions.Configuration. It loads the MongoDBSettings from configuration files such as appsettings.json by using the Aspire:MongoDB:Driver key.

The following example shows an appsettings.json file that configures some of the available options:

{
  "Aspire": {
    "MongoDB": {
      "Driver": {
        "ConnectionString": "mongodb://server:port/test",
        "DisableHealthChecks": false,
        "HealthCheckTimeout": 10000,
        "DisableTracing": false
      },
    }
  }

Use inline configurations

You can also pass the Action<MongoDBSettings> delegate to set up some or all the options inline:

builder.AddMongoDBClient("mongodb",
    static settings => settings.ConnectionString = "mongodb://server:port/test");

Configuration options

Here are the configurable options with corresponding default values:

Name Description
ConnectionString The connection string of the MongoDB database database to connect to.
DisableHealthChecks A boolean value that indicates whether the database health check is disabled or not.
HealthCheckTimeout An int? value that indicates the MongoDB health check timeout in milliseconds.
DisableTracing A boolean value that indicates whether the OpenTelemetry tracing is disabled or not.

Health checks

By default, .NET Aspire integrations enable health checks for all services. For more information, see .NET Aspire integrations overview.

By default, the .NET Aspire MongoDB database integration handles the following:

  • Adds a health check when enabled that verifies that a connection can be made commands can be run against the MongoDB database within a certain amount of time.
  • Integrates with the /health HTTP endpoint, which specifies all registered health checks must pass for app to be considered ready to accept traffic

Observability and telemetry

.NET Aspire integrations automatically set up Logging, Tracing, and Metrics configurations, which are sometimes known as the pillars of observability. For more information about integration observability and telemetry, see .NET Aspire integrations overview. Depending on the backing service, some integrations may only support some of these features. For example, some integrations support logging and tracing, but not metrics. Telemetry features can also be disabled using the techniques presented in the Configuration section.

Logging

The .NET Aspire MongoDB database integration uses standard .NET logging, and you'll see log entries from the following categories:

  • MongoDB[.*]: Any log entries from the MongoDB namespace.

Tracing

The .NET Aspire MongoDB database integration will emit the following Tracing activities using OpenTelemetry:

  • "MongoDB.Driver.Core.Extensions.DiagnosticSources"

Metrics

The .NET Aspire MongoDB database integration doesn't currently expose any OpenTelemetry metrics.

See also