There is several ways o do this, pick your poison:
- Environment Variables:
Use environment variables to store API keys outside of your source code.
Reference them in your app's configuration.
- Ionic Storage:
Use Ionic Storage with optional encryption to securely store data locally on the device.
- Secure Storage Plugins:
Utilize plugins like cordova-plugin-secure-storage-echo for secure key storage on iOS and Android.
- Backend Proxy:
Create a backend service that handles API requests, keeping API keys on the server side instead of the client.
- Database Storage
Store API keys in a database with encryption, centralized management, access control, and audit trails for better protection.