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I have installed magento2.3.0 in localhost wamp server, It is working fine.
When I'm trying to test GraphQL for PWA studio, I'm getting this error "TypeError: Failed to fetch".
You are on the right track but you can easily view Documentation when you click on Docs on the right top corner.
See screenshot with an example for the Category Query and the Documentation in the right sidebar.
Does the Documentation Explorer (Docs tab) load? Do you still receive the error?
to put the domain like http://mage230.localhost/graphql and not http://mage230/graphql
I had the same issue, but in my case I forgot the http:// now with a url http://mydomain.test/graphql it works.
Hope it helps.
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