C# REST-API

Open-source C# projects categorized as REST-API
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.NET C# REST clean-architecture asp-net-core
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Top 23 C# REST-API Projects

REST-API

  1. modular-monolith-with-ddd

    Full Modular Monolith application with Domain-Driven Design approach.

  2. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo

  3. run-aspnetcore-microservices

    Microservices on .NET platforms used ASP.NET Web API, Docker, RabbitMQ, MassTransit, Grpc, Yarp API Gateway, PostgreSQL, Redis, SQLite, SqlServer, Marten, Entity Framework Core, CQRS, MediatR, DDD, Vertical and Clean Architecture implementation with using latest features of .NET 8 and C# 12

  4. TodoApp

    Todo application with ASP.NET Core Blazor WASM, Minimal APIs and Authentication

  5. sample-dotnet-core-cqrs-api

    Sample .NET Core REST API CQRS implementation with raw SQL and DDD using Clean Architecture.

  6. coolstore-microservices

    A full-stack .NET microservices build on Dapr and Tye

  7. FilterLists

    :shield: The independent, comprehensive directory of filter and host lists for advertisements, trackers, malware, and annoyances.

    Project mention: FilterLists – Subscriptions for uBlock Origin, Adblock Plus, AdGuard | news.ycombinator.com | 2025-03-15

  8. Smartstore

    A modular, scalable and ultra-fast open-source all-in-one eCommerce platform built on ASP.NET Core 7

  9. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo

  10. Nager.Date

    Worldwide holidays access via WebApi, NuGet or docker container :earth_americas:

  11. Grid.Blazor

    Grid component with CRUD for Blazor (client-side and server-side) and ASP.NET Core MVC

  12. JsonApiDotNetCore

    A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.

  13. api-bricks-sdk

    SDKs for CoinAPI & FinFeedAPI

    Project mention: Pull Real-Time SEC Filings and Stock Data in Python (and Analyze It With AI!) | dev.to | 2025-06-25

    API Bricks SDK GitHub

  14. Warewolf

    Effortless Microservice Design and Integration. This repository includes the code-base for the Warewolf Studio and Server.

  15. Remora.Discord

    A data-oriented C# Discord library, focused on high-performance concurrency and robust design.

  16. Universalis

    A crowdsourced market board API for FFXIV.

  17. LeetU

    A basic REST API using EFCore and SQLite

  18. didact-engine

    The REST API and execution engine for the Didact Platform.

    Project mention: Dotnet Run App.cs | news.ycombinator.com | 2025-05-28

    I'm building a dotnet job orchestrator called Didact (https://www.didact.dev), and this is the sort of thing I was looking for years ago when I was first dreaming it up. Class libraries is the approach I am taking now, but this is still extremely interesting. Could see some interesting use cases for this...

  19. tgstation-server

    A production scale tool for DreamMaker server management

  20. RESTful-Unity

    RESTful-Unity aims to provides a simple RESTful HTTP server for Unity3d.

  21. AuthApi

    An example of a full-stack application for Authentication and Authorization, build with ASP.NET Core 9.0 (Minimal API) and Angular 19.

  22. Net8CoreApiBoilerplate

    Net Core Api startup project that can be used as base to upgrade legacy projects or start new one

  23. WebApiToolkit

    WebApi toolset that allows to make CRUD REST API like a cookie for ~ 20 lines of code, it also allow to build GRPC too

  24. nanoFramework.WebServer

    :package: Web server for .NET nanoFramework packed with features: REST api using attributes, multithread requests, parameters in query URL, static files serving.

  25. FileApi

    An example of a full-stack application for file upload and download, built with ASP.NET Core 9.0 (Minimal API) and Angular 19. (by Gramli)

  26. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

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C# REST-API related posts

  • Modular Monolith with DDD repository migrated to .NET 8.0

    1 project | /r/dotnet | 9 Dec 2023

  • The Starlight Celebration Begins December 15!

    1 project | /r/ffxiv | 8 Dec 2023

  • Best way to implement base class for API calls?

    2 projects | /r/csharp | 7 Dec 2023

  • New to MMOs and have some important questions before I begin. Should I start with Dynamis?

    1 project | /r/ffxiv | 6 Dec 2023

  • .NET Blazor

    7 projects | news.ycombinator.com | 21 Nov 2023

  • Self hosted DNS solution

    2 projects | /r/selfhosted | 27 Oct 2023

  • Make the comment section look like ARR just launched

    1 project | /r/ffxiv | 7 Jul 2023
  • A note from our sponsor - SaaSHub
    www.saashub.com | 17 Jul 2025
    SaaSHub helps you find the best software and product alternatives Learn more →

Index

What are some of the best open-source REST-API projects in C#? This list will help you:

# Project Stars
1 modular-monolith-with-ddd 12,168
2 run-aspnetcore-microservices 3,040
3 TodoApp 3,033
4 sample-dotnet-core-cqrs-api 2,984
5 coolstore-microservices 2,503
6 FilterLists 1,473
7 Smartstore 1,360
8 Nager.Date 1,220
9 Grid.Blazor 725
10 JsonApiDotNetCore 705
11 api-bricks-sdk 510
12 Warewolf 274
13 Remora.Discord 253
14 Universalis 195
15 LeetU 94
16 didact-engine 77
17 tgstation-server 75
18 RESTful-Unity 62
19 AuthApi 47
20 Net8CoreApiBoilerplate 44
21 WebApiToolkit 39
22 nanoFramework.WebServer 36
23 FileApi 26

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Stream - Scalable APIs for Chat, Feeds, Moderation, & Video.
Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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