Introspection query for GraphQL

introspection-query.graphql

  query IntrospectionQuery {
    __schema {
      queryType { name }
      mutationType { name }
      subscriptionType { name }
      types {
        ...FullType
      }
      directives {
        name
        description
        args {
          ...InputValue
        }
        onOperation
        onFragment
        onField
      }
    }
  }

  fragment FullType on __Type {
    kind
    name
    description
    fields(includeDeprecated: true) {
      name
      description
      args {
        ...InputValue
      }
      type {
        ...TypeRef
      }
      isDeprecated
      deprecationReason
    }
    inputFields {
      ...InputValue
    }
    interfaces {
      ...TypeRef
    }
    enumValues(includeDeprecated: true) {
      name
      description
      isDeprecated
      deprecationReason
    }
    possibleTypes {
      ...TypeRef
    }
  }

  fragment InputValue on __InputValue {
    name
    description
    type { ...TypeRef }
    defaultValue
  }

  fragment TypeRef on __Type {
    kind
    name
    ofType {
      kind
      name
      ofType {
        kind
        name
        ofType {
          kind
          name
        }
      }
    }
  }

The graphql reference implementation on JS has changed slightly and introspectionQuery is no longer exported as above. For newer versions of graphql (after graphql/graphql-js#2718), the above will break/not work, however, this seems to work after adapting to getIntrospectionQuery:

const path = require("path");
const fs = require("fs");
const fetch = require("node-fetch");
const {
    getIntrospectionQuery,
    printSchema,
    buildClientSchema
} = require("graphql");

async function main() {
  const introspectionQuery = getIntrospectionQuery();

    const response = await fetch(
        "https://<URL_HERE>/graphql",
        {
            method: "POST",
            headers: {
                "Content-Type": "application/json"
            },
            body: JSON.stringify({ query: introspectionQuery })
        }
    );

    const { data } = await response.json();

    const schema = buildClientSchema(data);

    const outputFile = path.join(__dirname, "./result.gql");

    await fs.promises.writeFile(outputFile, printSchema(schema));
}

main();

Good call updated getIntrospectionQuery 👍