GraphQL Schema Explorer

SDL stands for Schema Definition Language — the standard text format used to define a GraphQL API. It describes every type (Query, Mutation, Object, Input, Enum, etc.), their fields, and their relationships. SDL is what you write in .graphql files or pass to tools like Apollo Server or graphql-js to build an API.

Paste your SDL schema into the text area at the top. The tool instantly parses it and lists all types in the sidebar, grouped by kind (Query, Mutation, Object, Input, Enum, Scalar, Interface/Union). Click any type to see all its fields, their return types, required/optional status, and any doc-comments attached. You can also search by type name and copy individual type SDL blocks.

All standard GraphQL type kinds are supported: root operation types (Query, Mutation, Subscription), Object types, Input types, Enum types, Scalar types, Interface types, and Union types. Doc-comments written with triple-quotes (""" ... """) or hash comments (# ...) are also extracted and displayed.

Fields whose type ends with an exclamation mark (!) in SDL are marked as 'required' with a red badge. Fields without the ! suffix are marked 'optional' with a grey badge. This mirrors GraphQL's own non-null notation, helping you quickly identify which fields must always be present in a response or input.

Yes. Any valid GraphQL SDL is compatible — whether it's hand-written, generated by Apollo Server's buildSchema, exported from Hasura's introspection endpoint (convert to SDL first), or output by Prisma's nexus/pothos schema builder. The tool parses the SDL text directly, so just paste whatever SDL string you have.

No. The entire parser and explorer runs 100% in your browser using JavaScript. Your schema text is never sent to any server. This makes it safe to paste internal, proprietary, or production schemas without any data-leakage risk.