error-or/error-or

Health v2 · maintenance only

Adoption not part of the score

2081 stars · 115 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

ErrorOr is a C# library providing a fluent discriminated union type of either an error or a result value, letting developers replace exception-based control flow with explicit error handling. It supports multiple errors, implicit conversions, and functional methods like Match, Switch, and Then for chaining.

Use cases

• replace exceptions with result types in C#
• return multiple errors from a service method
• chain operations with fluent error handling
• implement railway-oriented programming in .NET
• model success-or-failure API responses

When to choose

• you write C#/.NET code and want explicit, exception-free error handling
• you need to propagate multiple errors through a fluent pipeline
• you want Match/Switch/Then combinators for result handling

When to avoid

• your codebase relies on exception-based flow control
• you need a language-level union type rather than a library abstraction
• you work outside the .NET ecosystem

Facets

library · maturity active

error-handling serialization developer-tools backend web-development dotnet cross-platform result-type discriminated-union functional-programming csharp nuget railway-oriented-programming

Member repositories

For agents

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