microsoft/RulesEngine

Health v2 · maintenance only

Adoption not part of the score

4341 stars · 617 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Microsoft-maintained .NET library for abstracting business rules and policies out of application code into externally stored, JSON-defined workflows evaluated via dynamic C# lambda expressions. It supports multiple and dynamic inputs, scoped/global parameters, custom actions, and a standalone expression evaluator.

Use cases

• evaluate business rules defined in json at runtime
• externalize discount or pricing rules from application code
• build a rule-based decision system in .NET
• dynamically evaluate c# expressions without recompiling
• store and update business policies in a database or blob storage
• run conditional workflow rules against multiple inputs

When to choose

• you need business rules changeable without redeploying the application
• you want json-defined rules with c# expression support in a dotnet app
• you need a fast, well-maintained rules engine with microsoft backing
• you need a standalone dynamic expression evaluator

When to avoid

• you need a full BPM/workflow orchestration engine with human tasks
• your project is not on .NET/.NET Standard
• you need forward-chaining inference like a RETE engine (e.g. Drools)
• rules are simple and hardcoding them in code is sufficient

Facets

library · maturity active

workflow-automation parser developer-tools developer-tools backend apis dotnet cross-platform jvm rules-engine business-rules expression-evaluator csharp-expressions json-rules nuget automation

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