APIClarity is an open-source tool that provides developers with the ability to:

Reconstruct OpenAPI specifications from live traffic, deployed clusters or local files. Monitor changes over time for APIs in production environments. Review proposed changes before they are deployed into production environments. Provide a learning phase where developers can learn about their APIs without deploying them into production (i.e., sandbox). Detect breaking backward compatibility issues prior to deployment of the change into production environments (i.e., sandboxes)
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