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auth fixing vet issues ... most relating to the Examples Feb 28, 2018
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wrappers.go implement grpc interceptor chaining May 14, 2016
wrappers_test.go add streaming client interceptor Sep 4, 2016


Go gRPC Middleware

Travis Build Go Report Card GoDoc SourceGraph codecov Apache 2.0 License quality: production Slack

gRPC Go Middleware: interceptors, helpers, utilities.

Important The repo recently moved to github.com/grpc-ecosystem/go-grpc-middleware, please update your import paths.


gRPC Go recently acquired support for Interceptors, i.e. middleware that is executed either on the gRPC Server before the request is passed onto the user's application logic, or on the gRPC client either around the user call. It is a perfect way to implement common patterns: auth, logging, message, validation, retries or monitoring.

These are generic building blocks that make it easy to build multiple microservices easily. The purpose of this repository is to act as a go-to point for such reusable functionality. It contains some of them itself, but also will link to useful external repos.

grpc_middleware itself provides support for chaining interceptors. See Documentation, but here's an example:

import "github.com/grpc-ecosystem/go-grpc-middleware"

myServer := grpc.NewServer(


Please send a PR to add new interceptors or middleware to this list


  • grpc_auth - a customizable (via AuthFunc) piece of auth middleware


  • grpc_ctxtags - a library that adds a Tag map to context, with data populated from request body
  • grpc_zap - integration of zap logging library into gRPC handlers.
  • grpc_logrus - integration of logrus logging library into gRPC handlers.



  • grpc_retry - a generic gRPC response code retry mechanism, client-side middleware



This code has been running in production since May 2016 as the basis of the gRPC micro services stack at Improbable.

Additional tooling will be added, and contributions are welcome.


go-grpc-middleware is released under the Apache 2.0 license. See the LICENSE file for details.