fetch-graphql-schema/lib/index.js

fetch GraphQL schema via introspection query

'use strict';

var fetch = require('node-fetch');

var _require = require('graphql/utilities'),
    buildClientSchema = _require.buildClientSchema,
    introspectionQuery = _require.introspectionQuery,
    printSchema = _require.printSchema;

module.exports = function fetchGraphQLSchema(url, options) {
  options = options || {}; // eslint-disable-line no-param-reassign
  return fetch(url, {
    method: 'POST',
    headers: {
      Accept: 'application/json',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      query: introspectionQuery
    })
  }).then(function (res) {
    return res.json();
  }).then(function (schemaJSON) {
    if (options.readable) {
      return printSchema(buildClientSchema(schemaJSON.data));
    }
    return JSON.stringify(schemaJSON, null, 2);
  });
};