Couper is a lightweight API gateway designed to support developers in building and operating API-driven Web projects.

• The quickest way to start is to use our Docker image.
  • or via homebrew: brew tap coupergateway/couper && brew install couper
• The documentation gives an introduction to Couper.
• Check out the example repository to learn about Couper's features in detail.
• Use-cases can be found on couper.io.

Couper …

• is a proxy component connecting clients with (micro) services
• adds access control and observability to the project
• needs no special development skills
• is easy to configure & integrate
• runs on Linux, macOS, Windows, Docker and Kubernetes.

Key features are:

• Easy Configuration & Deployment
• HTTP Request Routing / Forwarding
• Custom Requests and Responses
• Request / Response Manipulation
• Sequence and Parallel Backend Requests
• WebSockets Support
• Centralized Access-Control Layer:
  • Basic-Auth
  • JWT Validation & Signing
  • Single Sign On with SAML2
  • OAuth2 Client Credentials
  • OpenID Connect
• Configurable Service Connectivity
• Upstream Validation & CORS
• SPA & Web Serving
  • Inject server data / environment variables to your SPA
• Error Handling
• Observability
  • Prometheus exporter
• Security
  • mTLS support (server and backend)
  • Request size limiting

The full list of features of Couper 1.x is here or at couper.io.

Development requires Go. Start with make build. Couper requires a configuration file. You can start with a simple one and use:

./couper run -f public/couper.hcl

Thanks for your interest in contributing.

If you have any questions or feedback you are welcome to start a discussion.

If you have an issue please open an issue.