NestJS multiple GraphQL endpoints with code-first approach example

The problem

When trying to configure a single NestJS app with multiple GraphQL endpoints you would endup with following error:

Error: Schema must contain uniquely named types but contains multiple types named "TestModel".

For details, please, see this github issue.

The solution/workaround

This solution is built with the NestJS workspaces and introduces two apps with one shared library. Each app can configure its own GraphQL Module which will generate schema from objects that are in the scope of this app only.

The shared logic including resolvers can be places in the shared library.

How to run it

First, install the dependencies

yarn install

Then you can run both apps

nest start my-app

This will start the my-app applicaton on the port 3000

The GraphQL playground is available on http://localhost:3000/graphql

nest start my-project

This will start the my-project applicaton on the port 3001

The GraphQL playground is available on http://localhost:3001/graphql

Example GraphQL query:

query {
  helloWorld {
    message
  }
  shared {
    message
  }
}