AutoMapper is a convention-based object-object mapper for .NET that eliminates the need to write repetitive code that transforms one object type into another.
The problem AutoMapper solves is the tedious, error-prone work of manually mapping properties between objects—a common task in layered applications where data transfer objects, domain models, and view models need to be converted between each other. The tool uses a configuration-based approach where you declare mappings between types at application startup, then invoke those mappings at runtime with a single method call. This convention-based design means many mappings work automatically without explicit property-by-property configuration.
Developers should adopt AutoMapper when working on .NET applications that involve frequent object transformations, particularly in architectures using multiple object representations across layers. It suits projects of any scale where reducing boilerplate code and improving maintainability matter. The tool provides extension packages for specialized scenarios: collection mapping, expression mapping for LINQ queries, Entity Framework 6 integration, IDataReader mapping, and enum mapping. A commercial license option is available for those requiring paid support.
The project maintains active engagement with its user community through multiple channels including Stack Overflow support and a comprehensive wiki documenting both basic usage and advanced configuration details. The tool offers runtime introspection capabilities allowing developers to understand exactly what their mappings do during execution, which aids in debugging and validation. The project provides a commercial licensing model alongside its core functionality, indicating sustained investment in ongoing maintenance and support.
