As of January 2020 there seem to be no lightweight tools to visualize OpenAPI v3 instances. An alternative to this is to downgrade OpenAPI v3 to v2, for example, using OpenAPI-3to2 and then visualize with any of OpenAPI v2 tools.
Rendering tools for OpenAPI v3
As of January 2020 there seem to be no lightweight tools to visualize OpenAPI v3 instances. An alternative to this is to downgrade OpenAPI v3 to v2, for example, using OpenAPI-3to2 and then visualize with any of OpenAPI v2 tools.