GraphQL Schema to Introspection JSON Converter
Paste a GraphQL SDL schema to instantly run a real introspection query against it and get back the standard introspection JSON result. Free online developer tool.
Paste GraphQL Schema (SDL)
Introspection JSON
Introspection JSON will appear here...
Free GraphQL Schema to Introspection JSON Converter
Paste a GraphQL SDL schema to instantly run a real introspection query against it and get back the standard introspection JSON result — the same shape tools like GraphiQL, Apollo Studio, and codegen pipelines consume to understand your schema.
How to Use It
Paste your GraphQL schema definition language (SDL) into the input box, or click "Load Example" to see a sample run. The tool builds a real GraphQLSchema from your SDL using the reference graphql library, executes the standard introspection query against it, and shows you the resulting JSON.
Example
Given a schema with a User type implementing a Node interface, the introspection output includes a __schema.types array describing every type, its kind, its fields, and their argument and return types — exactly what a client needs to validate queries against your schema without a live server.
Common Use Cases
- Generating a static introspection snapshot for tools that need one without a running server.
- Feeding introspection JSON into Apollo Client's IntrospectionFragmentMatcher setup.
- Debugging what a schema actually exposes, field by field and type by type.
- Producing fixture data for tests that mock a GraphQL schema.
FAQs
Is this real introspection or a hand-rolled approximation?
It's real — the tool builds an actual GraphQLSchema from your SDL and executes the standard getIntrospectionQuery() query against it with the reference GraphQL.js engine, so the output matches exactly what a live GraphQL server would return.
What happens if my SDL has a syntax error?
The schema build step will fail with a descriptive error message shown above the input, telling you roughly where the SDL is invalid, rather than producing partial or incorrect output.
Is my schema uploaded anywhere?
No — parsing and introspection happen entirely client-side in your browser. Nothing you paste is sent to a server.