Snippet from the Advanced GraphQL workshop I run at OK GROW! - https://www.okgrow.com/graphql

engine.js

const engine = new Engine({
  engineConfig: {
    apiKey: ENGINE_API_KEY,
    logging: {
      level: 'DEBUG'   // Engine Proxy logging level
    }
  },
  graphqlPort: process.env.PORT
  endpoint: '/graphql',                 
});

app.use('/graphql', bodyParser.json(), graphqlExpress({
  schema,
  context: { /* ... */ },
  // enable tracing extension
  tracing: true,
  cacheControl: true
}));

engine.start();