Execute GraphQL Queries

executeGraphQLQuery.js

import {
  Source,
  parse,
  validate,
  execute,
  formatError,
  getOperationAST,
  specifiedRules
} from 'graphql';

function executeQuery(query, req) {
    let documentAST;

    const rootValue = { req };

    return new Promise((resolve, reject) => {
        const source = new Source(query, 'GraphQL request');

        try {
            documentAST = parse(source);
        } catch(err) {
            return reject(err);
        }

        const validationErrors = validate(schema, documentAST, specifiedRules);
        if (validationErrors.length > 0) {
            return reject(validationErrors);
        }

        execute(
            schema,
            documentAST,
            rootValue
        ).catch(err => {
            reject(err);
        }).then(data => {
            resolve(data);
        });
    });
}