configcat-js-ssr

import { getClient, User } from 'configcat-js-ssr'; // Replace with your actual SDK Key from the ConfigCat Dashboard const SDK_KEY = process.env.CONFIGCAT_SDK_KEY ?? 'YOUR_SDK_KEY'; async function initializeAndFetchFeatureFlags() { if (SDK_KEY === 'YOUR_SDK_KEY') { console.warn('Please replace YOUR_SDK_KEY with your actual ConfigCat SDK Key.'); } const configCatClient = getClient(SDK_KEY); // Example: Get a feature flag for a generic user const isMyAwesomeFeatureEnabled = await configCatClient.getValueAsync('isMyAwesomeFeatureEnabled', false); console.log(`'isMyAwesomeFeatureEnabled' for generic user: ${isMyAwesomeFeatureEnabled}`); if (isMyAwesomeFeatureEnabled) { console.log('Doing the new thing!'); } else { console.log('Doing the old thing.'); } // Example: Get a feature flag for a specific user const userObject = new User('some-user-id'); // User ID can be any unique string userObject.setEmail('user@example.com'); userObject.setCustom('region', 'eu'); const valueForSpecificUser = await configCatClient.getValueAsync('isMyAwesomeFeatureEnabled', false, userObject); console.log(`'isMyAwesomeFeatureEnabled' for user 'some-user-id': ${valueForSpecificUser}`); // Don't forget to close the client when done (e.g., on app shutdown) // This ensures resources are released, especially important in environments like serverless functions. configCatClient.dispose(); } initializeAndFetchFeatureFlags();