IconVault's GraphQL Studio turns a raw GraphQL SDL schema into an interactive playground. Paste your schema and the studio parses every type, enum, input, scalar, interface and union, letting you browse fields, arguments and relationships in a clean type explorer.

Then build queries with a visual field picker instead of writing them by hand, and generate a realistic mock JSON response that matches the query's shape, with sensible sample values per scalar. It is free with no signup and runs fully in your browser, nothing is uploaded. The honest caveat: the SDL parser handles standard schema syntax but not every exotic directive or extension, and mocks are fake data for testing, not a live server.