Discussion on: Deploy a fullstack NX workspace on Heroku

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There is a section "Update apps/api/src/main.ts to serve the built nx-fullstack client once built"

It is not clear to me what to change in the file for that step

Here you need to update the express to serve the static build of the frontend app. It is these lines that you need to add

const CLIENT_BUILD_PATH = path.join(__dirname, '../nx-fullstack');

const app = express();
app.use(express.static(CLIENT_BUILD_PATH));

and

// This route needs to come last after all your other api routes
app.get('*', (request, response) => {
  response.sendFile(path.join(CLIENT_BUILD_PATH, 'index.html'));
});