I have figured out that this gives me GraphQLSchema
, which I expect I can convert to JSON. How?
// @flow
import path from 'path';
import fs from 'fs';
import {
buildSchema,
} from 'graphql';
const main = () => {
const schemaPath = path.resolve(__dirname, '../schema.graphql');
console.log(buildSchema(fs.readFileSync(schemaPath, 'UTF8')));
};
main();
And how to do the inverse – how to convert JSON representation of GraphQL schema to GraphQL markup?
One way I have found to do it is:
import {
printSchema,
buildSchema,
buildClientSchema,
printIntrospectionSchema,
introspectionFromSchema,
} from 'graphql';
printSchema(buildClientSchema(introspectionFromSchema(buildSchema(fs.readFileSync('./schema.graphql', 'UTF8')))))
However, this looses a lot of data, eg
type Venue implements Node @preLoad {
# test
id: ID!
fuid: String!
url: String!
name: String!
cinema: Cinema!
futureEventCount: Int!
globalCinemaVenue: GlobalCinemaVenue
}
becomes:
type Venue implements Node {
id: ID!
fuid: String!
url: String!
name: String!
cinema: Cinema!
futureEventCount: Int!
globalCinemaVenue: GlobalCinemaVenue
}
You could use the following package which wasn't available at the time of this post I believe: https://www.npmjs.com/package/graphql-2-json-schema
import {
graphqlSync,
getIntrospectionQuery,
IntrospectionQuery
} from 'graphql';
import { fromIntrospectionQuery } from 'graphql-2-json-schema';
const options = {
ignoreInternals: true,
nullableArrayItems: true
}
const introspection = graphqlSync(schema, getIntrospectionQuery()).data as IntrospectionQuery;
const jsonSchema = fromIntrospectionQuery(introspection, options);
You do not need an external library here, you have all you need with graphql-js
:
import { introspectionFromSchema } from "graphql"
import { GraphQLFileLoader } from "@graphql-tools/graphql-file-loader"
import { loadSchema } from "@graphql-tools/load"
// it can be any source you want here
const schema = loadSchema("./schema.graphql", {
loaders: [new GraphQLFileLoader()],
})
const introspection = introspectionFromSchema(schema)
// Tada, you have your introspection
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