Simple React App with Apache Superset embedded dashboards
Based on this documentation: https://www.npmjs.com/package/@superset-ui/embedded-sdk?activeTab=readme

For embedding dashboards you need to implement these options to your superset-config.py:

FEATURE_FLAGS = {..., "EMBEDDED_SUPERSET": True}
# Dashboard embedding
GUEST_ROLE_NAME = "Gamma"
GUEST_TOKEN_JWT_SECRET = "your-secret"
GUEST_TOKEN_JWT_ALGO = "HS256"
GUEST_TOKEN_HEADER_NAME = "X-GuestToken"
GUEST_TOKEN_JWT_EXP_SECONDS = 300  # 5 minutes
WTF_CSRF_ENABLED = False
ENABLE_CORS = True

And provide some changes to App.js. You may need to switch your superset to HTTPS instead of HTTP if you want to use your dashboards on HTTPS sites.

How generated iframe will look like with manual sizing: