Silverback

Silverback is a message bus and broker integration library for .NET. It helps you build event-driven architectures and asynchronous workflows with first-class support for Apache Kafka and MQTT.

Silverback aims to be both high-level (consistent configuration and developer experience) and broker-aware. Kafka is a first-class citizen: features like partition-based parallelism, keys/partitioning, tombstones, Schema Registry integration, idempotency, and transactions are surfaced where they matter, instead of being abstracted away.

Why Silverback

• Kafka-first, not Kafka-only – a consistent API across brokers, while still leveraging Kafka-specific capabilities.
• Reliable by design – transactional outbox, error policies, and storage-backed features.
• Operational usability – structured logging, diagnostics, and tracing.
• Built-in cross-cutting features – headers, validation, encryption, chunking, batching.
• Testability – in-memory broker mocks and end-to-end helpers.

Documentation, guides, and samples are available here: https://silverback-messaging.net

Project Status

Continuous Build

Sonar Build

Quality Metrics

Activity

Getting Started

Silverback is modular – reference only what you need.

Packages

Core:

• Silverback.Core – message bus and core messaging components.
• Silverback.Core.Model – message semantics for event-driven/CQRS scenarios.

Broker integration:

• Silverback.Integration.Kafka – Kafka support.
• Silverback.Integration.Mqtt – MQTT support.

Optional features:

• Silverback.Core.Rx – Rx.NET integration.
• Silverback.Newtonsoft – Newtonsoft.Json serialization.
• Silverback.Kafka.SchemaRegistry – Confluent Schema Registry integration.

Storage (for outbox, client-side offsets, distributed locks):

• Silverback.Storage.PostgreSql
• Silverback.Storage.Sqlite
• Silverback.Storage.EntityFramework
• Silverback.Storage.Memory

Testing:

• Silverback.Integration.Kafka.Testing
• Silverback.Integration.Mqtt.Testing

Supported .NET Versions

Starting with v5, Silverback targets the latest .NET LTS version only.

Quick Example (Kafka)

services.AddSilverback()
    .WithConnectionToMessageBroker(options => options.AddKafka())
    .AddKafkaClients(clients => clients
        .WithBootstrapServers("PLAINTEXT://localhost:9092")
        .AddProducer(producer => producer
            .Produce<MyMessage>(endpoint => endpoint.ProduceTo("my-topic")))
        .AddConsumer(consumer => consumer
            .Consume<MyMessage>(endpoint => endpoint.ConsumeFrom("my-topic"))));

Usage

See the docs site for guides, API reference, and runnable examples:

• https://silverback-messaging.net

Contributing

See CONTRIBUTING.md.

License

MIT License. See LICENSE.