title: How to validate openapi 3.0.0 yaml spec?
body: <p>I have a yaml specification that has been updated from swagger 2.0 to openapi 3.0.0.</p>
  
  <p>The file itself is about 7,000 lines so it is challenging to validate by hand.</p>
  
  <p>I need to figure out which tags I have are no longer compatible with openapi 3.0.0. How can I validate my schema? Are there any command line tools I can use?</p>
  
  <p>I do not want to copy/paste this code somewhere online because I don't want to expose all the routes publicly.</p>