The best alternatives to ezyMock are Strapi, DuckRails, and StopLight. If these 3 options don't work for you, we've listed a few more alternatives below.
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Strapi is the next-gen headless CMS, open-source, javascript, enabling content-rich experiences to be created, managed and exposed to any digital device.
Platpi seamlessly converts OpenAPI docs into fully functional mock endpoints, with pseudo-realistic data, with the click of a button. Override response values, change status codes and speeds, all without hard coding data on your front-end, or deploying code.