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Here’s an example of a GraphQL query for retrieving car data that can be executed using the Apollo Client in AEM:

query GetCars {
  cars {
    id
    make
    model
    year
    price
  }
}

In this example, the query ‘GetCars' retrieves data for all cars, including the ‘id', ‘make‘, 'model‘, ‘year', and ‘price' of each car.

Once the query has been defined, it can be executed using the Apollo Client in your AEM project by calling the ‘query‘ method and passing the query string as an argument. The response from the server will include the requested data, which can then be used in your AEM project as needed.

Similar implementation for REACT applications:

Here’s an example of a GraphQL query to retrieve car data that can be executed using the Apollo Client in a React app:

import { gql } from 'apollo-boost';

const GET_CARS = gql`
  query GetCars {
    cars {
      id
      make
      model
      year
      color
    }
  }
`;

This query defines a GraphQL operation named ‘GetCars' that retrieves data about cars. The query specifies that it wants to retrieve the ‘id', ‘make‘, 'model‘, ‘year', and ‘price' fields of each car.

To execute this query using the Apollo Client in a React component, you can use the ‘useQuery‘ hook:

import React from 'react';
import { useQuery } from '@apollo/react-hooks';

function CarsList() {
  const { loading, error, data } = useQuery(GET_CARS);

  if (loading) return <p>Loading...</p>;
  if (error) return <p>Error :(</p>;

  return (
    <ul>
      {data.cars.map(car => (
        <li key={car.id}>
          {car.year} {car.make} {car.model} ({car.color})
        </li>
      ))}
    </ul>
  );
}

In this example, the ‘useQuery‘ hook is used to execute the ‘GET_CARS‘ query and retrieve the car data. The hook returns an object with three properties: ‘loading‘, ‘error', and 'data'. The component uses these properties to display a loading indicator while the query is being executed, an error message if an error occurs, or the list of cars if the query is successful.

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To install the Apollo Client in an AEM project, you can use either npm or yarn. Here’s how you can do it with npm:

1. Open the terminal in your AEM project directory
2. Run the following command: npm install apollo-client

And here’s how you can do it with yarn:

1. Open the terminal in your AEM project directory
2. Run the following command: yarn add apollo-client

Once the installation is complete, you can import and use the Apollo Client in your AEM project as per your requirements.

To import the Apollo Client library in your AEM component code, you can follow these steps:

1. Download the Apollo Client library: You can download the latest version of the Apollo Client library from the official Apollo Client website (https://www.apollographql.com/docs/react/).
2. Add the library to your project: You can add the downloaded library to your AEM component project as a dependency. For example, if you are using Maven, you can add the following to your pom.xml file:

<dependency>
  <groupId>com.apollographql.apollo</groupId>
  <artifactId>apollo-client</artifactId>
  <version>2.6.9</version>
</dependency>

3. Import the library in your component code: In your component code, you can import the Apollo Client using the following line of code:

import { ApolloClient } from 'apollo-client';

4. Initialize the Apollo Client: To use the Apollo Client, you need to create an instance of the ApolloClient and configure it with the URL of your GraphQL endpoint. For example:

const client = new ApolloClient({
  uri: 'http://localhost:8080/graphql'
});

Once you have added the library and imported it into your component code, you can start using it to fetch data from the GraphQL endpoint. You can also use the Apollo Client library to make mutations and perform other operations with your GraphQL endpoint.

This POC defines that GraphQL API can be consumed by one of the following approach.

Based on my research i felt best to use Apollo Client because Apollo Client is a state management library that simplifies managing remote and local data with GraphQL. Apollo Client’s intelligent caching and declarative approach to data fetching can help you iterate faster while writing less code.  Additionally, if you need custom functionality, you can create your dream client by building extensions on top of Apollo Client. (ref.)

Apollo client can be used to consume a GraphQL endpoint in AEM by implementing the following steps:

1. Install Apollo client in your AEM project using npm or yarn.
2. In your AEM component code, import the Apollo client and configure it to communicate with your GraphQL endpoint.
3. Define the GraphQL query that you want to execute using the Apollo client.
4. Use the Apollo client to execute the query and retrieve the data from the GraphQL endpoint.
5. Use the data retrieved from the GraphQL endpoint to render the content on the AEM page.

Refer to this example for above 3 steps – (reference)

Here is a sample code for consuming a GraphQL endpoint in AEM using Apollo client:

import { ApolloClient, gql, HttpLink, InMemoryCache } from 'apollo-boost';

const client = new ApolloClient({
  cache: new InMemoryCache(),
  link: new HttpLink({
  uri: 'https://your-gql-endpoint.com/graphql',
 }),
});

const query = gql '{ allCars { id make model year color price }';

client.query({query: query,}).then((data) => {console.log(data);
});

In this example, the Apollo client is configured to communicate with a GraphQL endpoint hosted at ‘https://your-gql-endpoint.com/graphql‘. The query defined in the code retrieves data for all cars from the GraphQL endpoint.