What is it

An open-source library for server-side GraphQL operation handling

import { ApolloClient, HttpLink } from '@apollo/client';

const client = new ApolloClient({
  link: new HttpLink({
      uri: 'your client uri goes here',
      fetchOptions: {
        ...
      }
  }),
});

Query = Request

Resolver

• how and where to fetch the data corresponding to a field
• API schema and database schemas are decoupled with GraphQL
  • e.g. resolver can be used to create a missing country field on an address schema

Schema = GraphQL has a typed schema system

Apollo vs GraphQL

Apollo is set of tools for working with GraphQL

• It is primarily an open-source library for server-side GraphQL operation handling

Apollo has both client and server libraries

• Server library helps you build the GQL APIs
• Client library helps you consume the APIs from your front end application