Data encryption

How do you handle data encryption in this app? The data entered within the app, and the data coming from the data API server is not encrypted in or through the app. Once the data is in this app the app performs ZERO (none, nada) encryption. You cannot search encrypted data within indexedDb, and encrypting your indexedDb data is a waste of time and energy. Instead the encryption should happen in transit (https connection to the data API server) and with device disk encryption (laptop, smartphone, or whatever device is running the app). If the device is stolen, then the device should have a strong access PIN or password so the device cannot be unencrypted.