One-click Query Generation
You can easily add a query (or fragment) you see in the documentation into the editor without having to manually type every field within the query. This makes it easier to test and develop with the available queries from the GraphQL server.

Clicking the ADD QUERY button inserts the query generated based on the schema. You can control how deep (nested) the generated query would be using the addQueryDepthLimit option (set to 3 by default) in the settings.
This is a query generated with addQueryDepthLimit set to 2.

This is the same query with addQueryDepthLimit set to 4.

Altair GraphQL Client