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Example: Schema Stitching with Apollo GraphQL

In this example two GraphQL schemas are stitched together to provide a single, consolidated view for the Client.

  • App 1 (Java, Spring Boot, graphql-java-tools): Beer
  • App 2 (JS/TS, graphql-tools): Rating

Using the schema stitching both schemas are merged together, linked together (Beer gets a direct link to its Ratings) and exposed via one endpoint.

Beer Rating Architecture

Running the example

Beer Backend

(Make sure you have Java 8 installed)

cd backend-beer
./gradlew bootRun
  • GraphQL endpoint: http://localhost:9010/graphql
  • GraphiQL Explorer: http://localhost:9010/graphiql

Rating Backend

cd backend-rating
yarn install
yarn start

(you can also use npm but I've tested with yarn)

  • GraphQL endpoint: http://localhost:9020/graphql
  • GraphiQL Explorer: http://localhost:9020/graphiql

Schema Stitcher

This process merges the GraphQL APIs from the Beer and the Rating backend together and exposes a single schema for the client.

cd schema-stitcher
yarn install
yarn start
  • GraphQL endpoint: http://localhost:9000/graphql
  • GraphiQL Explorer: http://localhost:9000/graphiql

Frontend

The example frontend is built using TypeScript, React and Apollo React. It consumes the API from the stitcher.

cd frontend
yarn install
yarn start
  • URL: http://localhost:9080