Signet

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What Signet is

Signet is an open-source framework for spec-driven contract testing of microservices. Its CLI proxy can capture requests and responses during tests to create consumer contracts in Pact format, while providers use OpenAPI specifications as their authoritative contracts. The test command checks a running provider against its published specification. The Signet Broker manages contracts and provides a web interface for exploring results; Deploy Guard checks compatibility and provider availability before a service is deployed to an environment. CLI commands and broker webhooks can connect testing and deployment checks to CI/CD pipelines. Teams can deploy the broker to AWS with a command that provisions an ECS Fargate cluster and supporting infrastructure, or use Docker Compose for other cloud providers or on-premises hosting. The CLI installs through npm, and the proxy and test commands require Node.js runtime support. Signet does not offer managed deployment, scaling or high availability. Its AWS deployment command requires the AWS CLI and a logged-in default profile with AdministratorAccess. Each consumer-provider integration needs a separate consumer contract, and each provider needs one provider specification.

Who it suits

Signet is designed for teams developing and deploying microservices that need to test service integrations. It is suited to teams able to manage their own broker hosting and deployment infrastructure.

What it does well

Records test traffic to generate Pact-format consumer contracts.
Checks running providers against OpenAPI specifications.
Deploy Guard checks compatibility and provider availability.
CI/CD pipelines can use CLI commands and broker webhooks.
Supports AWS and Docker Compose hosting options.

What to know first

No managed deployment, scaling or high availability.
AWS deployment requires AdministratorAccess on the default profile.
Requires a separate contract for each consumer-provider integration.
Proxy and test commands require Node.js runtime support.

Limits

Each consumer-provider integration needs its own consumer contract, and each provider needs one specification. Signet does not include managed deployment, scaling or high-availability operations.

Getting started

Install the CLI through npm
Ensure Node.js runtime support for proxy and test commands
Record service tests with the CLI proxy to generate consumer contracts
Publish provider OpenAPI specifications
Deploy the broker to AWS with signet deploy, or use Docker Compose
Connect CLI commands and broker webhooks to CI/CD pipelines

Verdict

Signet combines contract generation, provider verification and deployment checks for microservice teams. Its hosting choices are self-managed, and teams should account for its per-integration contract requirement.

Questions

Is Signet free?

Yes. Signet is free and open source.

Which platforms does it support?

Signet is available through API, web and self-hosted deployments.

What contract formats does it use?

Providers use OpenAPI specifications, while consumer contracts use Pact format.

Can Signet run on AWS?

Yes. The signet deploy command provisions an ECS Fargate cluster and broker infrastructure. AWS CLI and a logged-in default profile with AdministratorAccess are required.

Does Signet offer managed hosting?

No. Teams deploy and operate the broker themselves using AWS or Docker Compose.

Who created Signet?

The site credits Hernando Delgado, Zach Morgan, Michael Newman and Eric Vu as creators.

Facts from Signet's own pages

AWS deployment: The `signet deploy` command provisions an ECS Fargate cluster and deploys the broker and supporting infrastructure to AWS. · signet-framework.dev, 7 Oct 2026
AWS requirements: The AWS deploy command requires the AWS CLI and a logged-in default profile with AdministratorAccess. · signet-framework.dev, 7 Oct 2026
Broker: The Signet Broker manages contracts and provides a web interface for exploring test results. · signet-framework.dev, 7 Oct 2026
CI/CD: The CLI and broker webhooks let CI/CD pipelines automate contract testing and deployment checks. · signet-framework.dev, 7 Oct 2026
Consumer testing: The CLI can record existing service tests to generate consumer contracts, avoiding the need to write new tests for adoption. · signet-framework.dev, 7 Oct 2026
Contract formats: Signet uses OpenAPI specifications for providers and Pact-format consumer contracts. · signet-framework.dev, 7 Oct 2026
Contract generation: The CLI proxy records requests and responses during tests and generates a consumer contract. · signet-framework.dev, 7 Oct 2026
Deployment checks: Deploy Guard tracks deployments by environment and checks compatibility and provider availability before a service deploys. · signet-framework.dev, 7 Oct 2026
Deployment safety: Deploy Guard checks service compatibility and dependency deployment status before a service is deployed to an environment. · signet-framework.dev, 7 Oct 2026
Hosting: The broker can be self-hosted on AWS with the deploy command or started using the provided Docker Compose file. · signet-framework.dev, 7 Oct 2026
Installation: The CLI installs through npm, and the proxy and test commands require Node.js runtime support. · signet-framework.dev, 7 Oct 2026
Integrations: Signet documents use of AWS ECS Fargate for broker deployment, Docker Compose for self-hosting, and CI/CD webhooks. · signet-framework.dev, 7 Oct 2026
Intended users: Signet is designed for teams developing and deploying microservices that need to test service integrations. · signet-framework.dev, 7 Oct 2026
Maker: The site credits Hernando Delgado, Zach Morgan, Michael Newman, and Eric Vu as creators; it lists their locations as Charlotte, Bend, Miami, and San Jose respectively. · signet-framework.dev, 7 Oct 2026
Managed hosting: Signet does not provide a managed option for deployment, scaling, or high availability. · signet-framework.dev, 7 Oct 2026
Notable limit: Signet requires a separate consumer contract for each consumer-provider integration and one provider specification per provider. · signet-framework.dev, 7 Oct 2026
OpenAPI contracts: An OpenAPI spec is the authoritative contract that consumer and provider services are expected to follow. · signet-framework.dev, 7 Oct 2026
Other hosting: For other cloud providers or on-premises hosting, Signet provides a Docker Compose deployment option. · signet-framework.dev, 7 Oct 2026
Provider verification: The test command checks a running provider service against its published API specification. · signet-framework.dev, 7 Oct 2026
Purpose: Signet is an open-source framework for spec-driven contract testing of microservices. · signet-framework.dev, 7 Oct 2026
Web interface: The Signet Broker has a web interface for managing contracts and exploring test results. · signet-framework.dev, 7 Oct 2026

Where Signet stands on Freedom251

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