OpenAPI 3.1 is becoming the standard for API specifications because it aligns with JSON Schema 2020-12, improves interoperability, and gives teams more accurate validation. If you are migrating from OpenAPI 3.0.x—or starting a new API—you need testing tools that can import OpenAPI 3.1 specs, validate schemas correctly, and fit into your development workflow. Try Apidog today This guide compares API testing tools that support OpenAPI 3.1 and shows how to use them in practical workflows: importing specs, generating tests, validating schemas, mocking APIs, and running checks in CI/CD.…