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Overview
AutoMapper is a .NET object-to-object mapping library. It lets applications declare source-to-destination type maps with CreateMap and centralize repetitive property-assignment code used for DTOs and similar models.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Declare type maps instead of repeating property assignments
CreateMap<Source, Destination>() defines a mapping and mapper.Map<Destination>(source) executes it.
Sources: [1]
Integrate with DI and extensibility points
It integrates with IServiceCollection and supports resolvers, converters, conditions, and mapping actions for specialized conversions.
Sources: [1]
Best fit
Fits repetitive mappings between structurally similar .NET models
It is most useful when applications have many DTO, API, or view-model transformations with largely corresponding members.
Sources: [1]
Before adoption
Validate mapping configuration during development
The README demonstrates AssertConfigurationIsValid() for development-time validation; complex conversions should also be covered by explicit tests.
Sources: [1]
Version 16 requires a licensing and license-key decision
LICENSE.md describes RPL 1.5 terms and points users who do not want to release their software under those terms to a commercial License Agreement. The README also documents license-key configuration, so organizational use should review the applicable path.
Official sources
- [1]AutoMapper v16.2.0 README(2026-10-03)
- [2]AutoMapper v16.2.0 LICENSE.md(2026-10-03)
- [3]AutoMapper v16.2.0 release(2026-10-03)
Supplemental curator note
AutoMapper can remove repetitive DTO mapping code, but complex business rules should not disappear into opaque mapping configuration. Version 16 adoption should also include license-key setup and a review of the applicable license path.
Try it in 3 steps
- 1
Add AutoMapper 16.2.0 to a .NET project
Pin the stable release in the target project and review the applicable licensing terms before use.
dotnet add package AutoMapper --version 16.2.0 - 2
Register the license key and type map
Follow the README DI example to configure the license key and source-to-destination mapping.
services.AddAutoMapper(cfg => { cfg.LicenseKey = "<LICENSE_KEY>"; cfg.CreateMap<Foo, FooDto>(); }); - 3
Map an object to the destination type
Execute the registered map. During development, also validate configuration with AssertConfigurationIsValid().
var fooDto = mapper.Map<FooDto>(foo);
Growth
Growth trends · Last 30 days
10,186 Stars
Trend data is still being collected.
Development activity
Last 90 days · weekly
- Commits (last 30 days)
- 9
- Open PRs
- 2
Development activity is still being collected.
Built with
Categories and tags
Categories
Tags
GitHub data
GitHub dataView detailed GitHub data
- Stars
- 10,186
- Forks
- 2,400
- Watchers
- 369
- Open issues
- 12
- Contributors
- 152
- Owner type
- Organization
- Primary language
- C#
- License
- Not determined
- Repository last updated
- Sep 9, 2026
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