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Top 10 .NET Core Libraries Every Web Developer Should Know

Top 10 .NET Core Libraries Every Web Developer Should Know

Open-source libraries significantly reduce developers’ work and allow them to create and manage their applications easily.

In this article, I’ll describe some of the most useful .NET Core libraries that every developer needs to know:


Swashbuckle is a library that generates beautiful API documentation, including the Swagger UI, to explore and test API operations. This can be configured in your project and it will take only a few minutes to get started.

GitHub: Swashbuckle.AspNetCore

License: MIT

Stars: 2.8k


Polly , according to its website, “allows developers to express resilience and transient fault-handling policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner.”

GitHub: App-vNext/Polly

License: BSD-3-Clause

Stars: 6.9k


AutoMapper is a popular object-to-object mapper library used to map the properties of two different objects. This will reduce developer work and help us avoid unwanted code when mapping values.

GitHub: AutoMapper

License: MIT

Stars: 6.9k


Building multitenant applications is quite difficult. But this library makes adding multitenancy as simple as possible. This library uses the concept of adding middleware using the OWIN interface. The author of this library has written many blog posts on how to configure SaasKit. Check the blog out for more details.

GitHub: Saaskit

License: Apache License 2.0

Stars: 5.6k


This project is a BeatPulse liveness checker and UI port for the new feature included in the ASP.NET Core 2.2 version of Microsoft Health Checks. Using this library, we can monitor health checks for all apps, databases, APIs, Azure services, etc. This library can create beautiful UIs to display health checks.AspNetCore.Diagnostics.HealthChecks

GitHub: AspNetCore.Diagnostics.HealthChecks

License: Apache License 2.0

Stars: 1.1k


MailKit is a cross-platform mail client library built on top of MimeKit. The goal of this project is to provide the .NET world with robust, fully featured, and RFC-compliant SMTP, POP3, and IMAP client implementations.

GitHub: MailKit

License: MIT

Stars: 3k


CacheManager is an open-source abstraction layer written in C# for .NET. It supports different providers of caches and incorporates other advanced features.

The CacheManager package’s main objective is to make life easier for developers to handle even very complex caching scenarios.

GitHub: CacheManager

License: Apache-2.0

Stars: 1.6k


Dapper is a simple object mapper for .NET. This high-performance micro-ORM supports SQL Server, MySQL, Sqlite, SqlCE, Firebird, and so on. It can be used by simply installing the NuGet package, which extends the IDbConnection interface functionality. The familiar Stack Overflow site is using this library.

GitHub: Dapper

License: Apache-2.0

Stars: 11.8k


Ocelot is a. NET platform API gateway. This project is intended for people who use .NET or Core to run a microservice or service-oriented architecture that requires a unified system entry point. It will work with anything that uses HTTP. It runs on any ASP.NET Core-supported platform.

GitHub: Ocelot

License: MIT

Stars: 4.5k


NLog is an open-source logging tool for use in applications for .NET and Xamarin. It’s free, cross-platform, and easy to set up and expand. NLog is a great easy-to-use logging application with excellent log routing and management features, making it a good choice when selecting a high-performance logging system.

GitHub: NLog

License: BSD 3-Clause

Stars: 4.2k


I hope this blog has introduced you to some of the key open-source libraries of .NET. Besides these, you can find some more important libraries on this GitHub page.

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Comments (21)

Great contribution. Thanks!

I agree with this.

What are your thoughts about Steeltoe being on this list?

Steeltoe is one of the good libraries to create cloud-native microservices.

SaasKit hasn’t been updated since 2016, and doesn’t supports .NET Core 2 (let alone 3)

Was my first concern. How it made the list confuses me. I would not trust it in a production dotnet core app.

Hi Thomas,

We made this list based on popularity and stars got in GitHub. We will revisit our list. Finbuckle.MultiTenant supports latest versions of .NET Core


You forgot Serilog.

Hi Daniel,

Serilog is a good alternate to NLog. You pick either of them.


These are really important libraries of .NET which you introduced. Thanks a lot

Thanks for your feedback!


SaasKit is completely dead from what I can see.
Latest commit from 3 years ago. Too much water under the bridge to even consider it valid by this time.

Everything else seems quite fine so far.

Hi Cesar,

Thanks you for pointing to that and we agree with your point. SaasKit doesn’t support the latest .NET Core version. We will revisit our list.


Good collection. Serilog is also a great logging library.

Thanks. Yes, Serilog is a good alternate to NLog.

CachaMamager hasn’t been updated since 2018. It’s dead.

We have included CacheManager in this list based on popularity and number of downloads. You can find few other alternates to this like Electron.Net. Checkout this link,

Instead of Dapper, I highly recommand Insight.Database

Insight.Database is a good alternate to Dapper. Each have their own pros and cons.


Thanks for the list and the Comments

First I want to thank you for your effort.
Great Blog! I agree with you. This is very well written

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