I have a readyAPI license, do i need separate license for Swagger editor?

Hey frankW . Swagger Editor is open source, so you don't need any license for it. If you're talking about SwaggerHub (SmartBear's commercial Swagger tool), then there is a Free plan with limited functionality (including an editor) which you don't need a license for. For Teams or Enterprise plan, you would need a license. I hope this helps!

Swagger Editor (open source): https://editor.swagger.io/

Create free SwaggerHub account: https://try.smartbear.com/