ContractGuard

ContractGuard is a developer tool for FastAPI applications that helps you detect and manage API contract changes.

It generates your application's OpenAPI schema, stores a baseline contract, and compares future changes against that baseline so you can identify breaking API changes before they reach production.

Why ContractGuard?

APIs evolve constantly.

You add a new endpoint, rename a response field, change a parameter, modify a request body, or remove an endpoint.

The problem is that some of these changes can silently break existing clients.

ContractGuard helps you answer:

"Did my API contract change?"

and more importantly:

"Did I accidentally introduce a breaking change?"

Features

• Generate OpenAPI schema from a FastAPI application
• Initialize an API contract baseline
• Compare the current API schema with the stored contract
• Detect API contract changes
• Check contracts from the command line
• Update the stored contract after intentional changes
• Generate API documentation
• Designed specifically for FastAPI projects
• Simple CLI workflow

-- TO BE LAUNCHED SOON