Swagger editor and OpenApi 3.0

That's an old version of Swagger Editor.

To run the latest Swagger Editor locally, use one of these options:

1) Clone the repository

git clone https://github.com/swagger-api/swagger-editor.git

then

npm start

This will start the editor on http://127.0.0.1:3001.

2) Run the Docker image:

https://github.com/swagger-api/swagger-editor/#running-the-image-from-dockerhub

3) Download the static assets (index.html and the dist folder) from the repository:

https://github.com/swagger-api/swagger-editor

Then open the index.html page in a browser, or put the assets onto a web server and load the page from there.