Yokai
Yokai is a simple, modular Go backend framework that provides built-in dependency injection, logging, tracing, metrics, health checks, and support for HTTP, gRPC, MCP server, and worker application patterns with minimal boilerplate.
Best When
You are building a Go backend service and want production-grade observability (logging, tracing, metrics) and dependency injection pre-configured, without setting it all up from scratch.
Avoid When
Your team is unfamiliar with Go or Uber's Fx dependency injection patterns, or you need a language-agnostic framework.
Use Cases
- • Building production-grade Go HTTP or gRPC microservices with observability pre-wired
- • Creating MCP servers in Go with structured dependency injection and configuration management
- • Developing background worker applications with built-in health monitoring
- • Scaffolding new Go backend services that need OpenTelemetry tracing and metrics from day one
Not For
- • Non-Go projects or teams preferring Python, Node.js, or other runtimes
- • Simple scripts or CLI tools that don't need a full framework
- • Projects that already use a different Go DI framework (Wire, dig) and don't want to migrate
Alternatives
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Scores are editorial opinions as of 2026-03-01.