hello-graphql.js

var graphql = require('graphql');

var userType = new graphql.GraphQLObjectType({
  name: 'User',
  fields: () => ({
    id: {type: graphql.GraphQLString},
    name: {type: graphql.GraphQLString},
    friends: {
      type: new graphql.GraphQLList(userType),
      args: {
        close: {type: graphql.GraphQLBoolean}
      },
      resolve: function(_, args) {
        if(args.close) {
          return [{id: "close", name: "close friend"}]
        } else {
          return [{id: "not-close", name: "not close friend"}];
        }
      }
    }
  })
});

var schema = new graphql.GraphQLSchema({
  query: new graphql.GraphQLObjectType({
    name: 'Query',
    fields: {
      user: {
        type: userType,
        args: {
          id: {type: graphql.GraphQLString, required: true}
        },
        resolve: function(_, args) {
          console.log('Args:', args);
          return {id: 'one', name: "Arunoda", friends: [100, 200, 300]};
        }
      }
    }
  })
});

var query = `
  {
    user {
      name,
      friends(close: true) {
        name,
        friends(close: true) {
          name
        }
      }
    }
  }
`;

graphql.graphql(schema, query).then(result => {
  console.log(JSON.stringify(result, null, 2));
});