Open Settings
Tap Wi-Fi
Tap the connected network
Tap Password
Authenticate with Face ID, Touch ID, or passcode
View or copy the Wi-Fi password
If Password is not shown, go to Settings
Tap Passwords
Authenticate with Face ID, Touch ID, or passcode
Search for the Wi-Fi network name
Tap the network entry to view the password
If needed, use iCloud Keychain on a Mac signed in with the same Apple ID
Open Keychain Access
Search for the Wi-Fi network name
Open the network item
Check Show password
Authenticate with the Mac password or Touch ID