CODE EXAMPLE FOR JAVASCRIPT

graphql json schema

import {
    graphqlSync,
    getIntrospectionQuery,
    IntrospectionQuery
} from 'graphql';

import { fromIntrospectionQuery } from 'graphql-2-json-schema';

const options = {
  // Whether or not to ignore GraphQL internals that are probably not relevant
  // to documentation generation.
  // Defaults to `true`
  ignoreInternals: true,
  // Whether or not to properly represent GraphQL Lists with Nullable elements
  // as type "array" with items being an "anyOf" that includes the possible
  // type and a "null" type.
  // Defaults to `false` for backwards compatibility, but in future versions
  // the effect of `true` is likely going to be the default and only way. It is
  // highly recommended that new implementations set this value to `true`.
  nullableArrayItems: true
}

// schema is your GraphQL schema.
const introspection = graphqlSync(schema, getIntrospectionQuery()).data as IntrospectionQuery;

const jsonSchema = fromIntrospectionQuery(introspection, options);