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AWS Lambda for .NET Gitter

Repository for the AWS NuGet packages and Blueprints to support writing AWS Lambda functions using .NET Core.

For a history of releases view the release change log

Table of Contents

NuGet Packages

This repo contains a number of different tools and libraries to support development of Lambda functions using .NET. These packages have individual README docs outlining specific information for that particular package. These packages are cataloged here.


This packages in this folder contains classes that can be used as input types for Lambda functions that process various AWS events.

These are the packages and their files:


Package adds commands to the dotnet cli that can be used to manage Lambda functions including deploying a function from the dotnet cli. For more information see the file for Amazon.Lambda.Tools.

Global Tool Migration

As of September 10th, 2018 Amazon.Lambda.Tools has migrated to be .NET Core Global Tools. As part of the migration the version number was set to

To install Amazon.Lambda.Tools use the dotnet tool install command.

dotnet tool install -g Amazon.Lambda.Tools

To update to the latest version of Amazon.Lambda.Tools use the dotnet tool update command.

dotnet tool update -g Amazon.Lambda.Tools
Migrating from DotNetCliToolReference

To migrate an existing project away from the older project tool, you need to edit your project file and remove the DotNetCliToolReference for the Amazon.Lambda.Tools package. For example, let's look at an existing Lambda project file.

<Project Sdk="Microsoft.NET.Sdk">

    <-- The new property indicating to AWS Toolkit for Visual Studio this is a Lambda project -->
    <-- This line needs to be removed -->
    <DotNetCliToolReference Include="Amazon.Lambda.Tools" Version="2.2.0" />

    <PackageReference Include="Amazon.Lambda.Core" Version="1.0.0" />
    <PackageReference Include="Amazon.Lambda.Serialization.Json" Version="2.1.0" />

To migrate this project, you need to delete the DotNetCliToolReference element, including Amazon.Lambda.Tools. If you don't remove this line, the older project tool version of Amazon.Lambda.Tools will be used instead of an installed Global Tool.

The AWS Toolkit for Visual Studio before .NET Core 2.1 would look for the presence of Amazon.Lambda.Tools in the project file to determine whether to show the Lambda deployment menu item. Because we knew we were going to switch to Global Tools, and the reference to Amazon.Lambda.Tools in the project was going away, we added the AWSProjectType property to the project file. The current version of the AWS Toolkit for Visual Studio now looks for either the presence of Amazon.Lambda.Tools or the AWSProjectType set to Lambda. Make sure when removing the DotNetCliToolReference that your project file has the AWSProjectType property to continue deploying with the AWS Toolkit for Visual Studio.


The Lambda Annotations library allows C# functions to use .NET attributes for a more idiomatic experience writing Lambda functions. This includes dependency injection integration, simplified access to Lambda event information and automatic synchronization with CloudFormation template. For more information see the file for Amazon.Lambda.Annotations.


Package makes it easy to run ASP.NET Core Web API applications as Lambda functions. For more information see the file for Amazon.Lambda.AspNetCoreServer.


Package includes test implementation of the interfaces from Amazon.Lambda.Core and helper methods to help in locally testing. For more information see the file for Amazon.Lambda.TestUtilities.


Blueprints in this repository are .NET Core Lambda functions that can used to get started. In Visual Studio the Blueprints are available when creating a new project and selecting the AWS Lambda Project.

Dotnet CLI Templates

New .NET Core projects can be created with the dotnet new command. By installing the Amazon.Lambda.Templates NuGet package the AWS Lamdba blueprints can be created from the dotnet new command. To install the template execute the following command:

dotnet new -i "Amazon.Lambda.Templates::*"

The ::* on the end of the command indicates the latest version of the NuGet package.

To see a list of the Lambda templates execute dotnet new list --author AWS

> dotnet new list --author AWS              

Template Name                                                                         Short Name                                    Language  Tags                 
------------------------------------------------------------------------------------  --------------------------------------------  --------  ---------------------
Empty Top-level Function                                                              lambda.EmptyTopLevelFunction                  [C#]      AWS/Lambda/Serverless

Lambda Annotations Framework (Preview)                                                serverless.Annotations                        [C#]      AWS/Lambda/Serverless

Lambda ASP.NET Core Minimal API                                                       serverless.AspNetCoreMinimalAPI               [C#]      AWS/Lambda/Serverless

Lambda ASP.NET Core Web API                                                           serverless.AspNetCoreWebAPI                   [C#],F#   AWS/Lambda/Serverless

Lambda ASP.NET Core Web API (.NET 6 Container Image)                                  serverless.image.AspNetCoreWebAPI             [C#],F#   AWS/Lambda/Serverless

Lambda ASP.NET Core Web Application with Razor Pages                                  serverless.AspNetCoreWebApp                   [C#]      AWS/Lambda/Serverless

Lambda Custom Runtime Function (.NET 7)                                               lambda.CustomRuntimeFunction                  [C#],F#   AWS/Lambda/Function  

Lambda Detect Image Labels                                                            lambda.DetectImageLabels                      [C#],F#   AWS/Lambda/Function

Lambda Empty Function                                                                 lambda.EmptyFunction                          [C#],F#   AWS/Lambda/Function

Lambda Empty Function (.NET 7 Container Image)                                        lambda.image.EmptyFunction                    [C#],F#   AWS/Lambda/Function

Lambda Empty Serverless                                                               serverless.EmptyServerless                    [C#],F#   AWS/Lambda/Serverless

Lambda Empty Serverless (.NET 7 Container Image)                                      serverless.image.EmptyServerless              [C#],F#   AWS/Lambda/Serverless

Lambda Function project configured for deployment using .NET 7's Native AOT feature.  lambda.NativeAOT                              [C#],F#   AWS/Lambda/Function

Lambda Giraffe Web App                                                                serverless.Giraffe                            F#        AWS/Lambda/Serverless

Lambda Simple Application Load Balancer Function                                      lambda.SimpleApplicationLoadBalancerFunction  [C#]      AWS/Lambda/Function

Lambda Simple DynamoDB Function                                                       lambda.DynamoDB                               [C#],F#   AWS/Lambda/Function

Lambda Simple Kinesis Firehose Function                                               lambda.KinesisFirehose                        [C#]      AWS/Lambda/Function

Lambda Simple Kinesis Function                                                        lambda.Kinesis                                [C#],F#   AWS/Lambda/Function

Lambda Simple S3 Function                                                             lambda.S3                                     [C#],F#   AWS/Lambda/Function

Lambda Simple SNS Function                                                            lambda.SNS                                    [C#]      AWS/Lambda/Function

Lambda Simple SQS Function                                                            lambda.SQS                                    [C#]      AWS/Lambda/Function

Lex Book Trip Sample                                                                  lambda.LexBookTripSample                      [C#]      AWS/Lambda/Function

Order Flowers Chatbot Tutorial                                                        lambda.OrderFlowersChatbot                    [C#]      AWS/Lambda/Function

Serverless Detect Image Labels                                                        serverless.DetectImageLabels                  [C#],F#   AWS/Lambda/Serverless

Serverless project configured for deployment using .NET 7's Native AOT feature.       serverless.NativeAOT                          [C#],F#   AWS/Lambda/Serverless

Serverless Simple S3 Function                                                         serverless.S3                                 [C#],F#   AWS/Lambda/Serverless

Serverless WebSocket API                                                              serverless.WebSocketAPI                       [C#]      AWS/Lambda/Serverless

Step Functions Hello World                                                            serverless.StepFunctionsHelloWorld            [C#],F#   AWS/Lambda/Serverless

To get details about a template, you can use the help command.

dotnet new lambda.EmptyFunction --help

Template Instantiation Commands for .NET Core CLI.                                                                                          
Lambda Empty Function (C#)                                                                                                                  
Author: AWS                                                                                                                                 
  -p|--profile  The AWS credentials profile set in aws-lambda-tools-defaults.json and used as the default profile when interacting with AWS.
                string - Optional                                                                                                           
  -r|--region   The AWS region set in aws-lambda-tools-defaults.json and used as the default region when interacting with AWS.              
                string - Optional  

The templates take two optional parameters to set the profile and region. These values are written to the aws-lambda-tools-default.json.

To create a function, run the following command

dotnet new lambda.EmptyFunction --name BlogFunction --profile default --region us-east-2

Yeoman (Deprecated)

The Yeoman generators have been deprecated in favor of the new dotnet new templates. They will not be migrated from the older project.json based project system.

Getting Help

To learn more about the various packages in this repo, please reference our Learning Resources document. In particular, please be sure to read through the official Lambda Developer Guide.

If those resources are not sufficient to answer your question or resolve your issue, please feel free to open an issue on this repo.

Feedback and Contributing

We welcome community contributions to our codebase and tools! If you would like to contribute, please read through the document (our contribution guide) and check issues and open pull requests to ensure that the fix/feature you want to contribute is not already in development.