InMemoryEmulator.MongoDB.JsTriggers 1.1.4

.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher. 
dotnet add package InMemoryEmulator.MongoDB.JsTriggers --version 1.1.4
                    


                    

                
NuGet\Install-Package InMemoryEmulator.MongoDB.JsTriggers -Version 1.1.4
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="InMemoryEmulator.MongoDB.JsTriggers" Version="1.1.4" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="InMemoryEmulator.MongoDB.JsTriggers" Version="1.1.4" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="InMemoryEmulator.MongoDB.JsTriggers" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add InMemoryEmulator.MongoDB.JsTriggers --version 1.1.4
                    


                    

                
#r "nuget: InMemoryEmulator.MongoDB.JsTriggers, 1.1.4"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package InMemoryEmulator.MongoDB.JsTriggers@1.1.4
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=InMemoryEmulator.MongoDB.JsTriggers&version=1.1.4
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=InMemoryEmulator.MongoDB.JsTriggers&version=1.1.4
                    


                            Install as a Cake Tool

<img src="icon.svg" width="32" height="32" alt="InMemoryEmulator.MongoDB icon" style="vertical-align: middle;"> InMemoryEmulator.MongoDB

NuGet License: MIT

A high-fidelity, in-process fake for the MongoDB .NET/C# Driver — zero Docker, zero network, instant startup.

Why?

  • Instant — ~0ms startup (vs 2-15s for Docker/Mongo2Go)
  • Portable — No Docker, no mongod binaries, no ports
  • Reliable — No flaky timeouts, port conflicts, or container failures
  • High-fidelity — Real filter, update, and aggregation semantics (not mocks)

Quick Start

dotnet add package InMemoryEmulator.MongoDB          # for MongoDB.Driver 3.x
dotnet add package InMemoryEmulator.MongoDB.V2Driver  # for MongoDB.Driver 2.x

Unit Tests

var result = InMemoryMongo.Create<Order>("orders");
var collection = result.Collection;

await collection.InsertOneAsync(new Order { Total = 99.99m });
var found = await collection.Find(o => o.Total > 50).FirstOrDefaultAsync();

Integration Tests (DI)

services.UseInMemoryMongoDB(options =>
{
    options.DatabaseName = "testdb";
    options.AddCollection<Order>("orders");
});

What's Supported

Feature Status
Full CRUD (Insert, Find, Update, Replace, Delete, BulkWrite) ✅
Aggregation Pipeline (34 stages, 100+ expression operators) ✅
Indexes (Unique, Compound, Sparse, Partial Filter, TTL) ✅
Change Streams ✅
Transactions (snapshot isolation) ✅
GridFS ✅
Schema Validation ($jsonSchema) ✅
Capped Collections + Tailable Cursors ✅
Views ✅
LINQ (AsQueryable()) ✅
Fault Injection ✅
State Persistence (Export/Import) ✅
DI Integration (2 extension methods) ✅

NuGet Packages

Package Description NuGet
InMemoryEmulator.MongoDB Core library for MongoDB.Driver 3.x NuGet Version
InMemoryEmulator.MongoDB.V2Driver Core library for MongoDB.Driver 2.x NuGet Version
InMemoryEmulator.MongoDB.JsTriggers $function, $accumulator, $where via Jint NuGet Version

Both packages share the same namespace (InMemoryEmulator.MongoDB) and feature set. Pick the one matching your driver version — the API is identical.

Documentation

See the Wiki for full documentation:

Requirements

  • .NET 8.0+
  • InMemoryEmulator.MongoDB requires MongoDB.Driver 3.x (tested up to 3.8.1)
  • InMemoryEmulator.MongoDB.V2Driver requires MongoDB.Driver 2.x (tested up to 2.30.0)

License

MIT

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.1.4 89 5/25/2026
1.1.1 99 5/17/2026
1.1.0 93 5/13/2026
1.0.1 94 5/12/2026