api mock - SERP Analysis

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https://beeceptor.com/

https://mockoon.com/

https://designer.mocky.io/

https://wiremock.org/

https://www.getambassador.io/blog/api-mocking-vs-api-stubbing-differences

https://learning.postman.com/docs/design-apis/mock-apis/mock-with-api/

https://mocki.io/

https://katalon.com/resources-center/blog/what-is-api-mocking