Hide header in stack navigator React navigation

On v4 simply use below code in the page you want to hide the header

export default class Login extends Component {
    static navigationOptions = {
        header: null
    }
}

refer to Stack Navigator

UPDATE as of version 5

As of version 5 it is the option headerShown in screenOptions

Example of usage:

<Stack.Navigator
  screenOptions={{
    headerShown: false
  }}
>
  <Stack.Screen name="route-name" component={ScreenComponent} />
</Stack.Navigator>

If you want only to hide the header on 1 screen you can do this by setting the screenOptions on the screen component see below for example:

<Stack.Screen options={{headerShown: false}} name="route-name" component={ScreenComponent} />

See also the blog about version 5

UPDATE
As of version 2.0.0-alpha.36 (2019-11-07),
there is a new navigationOption: headershown

      navigationOptions: {
        headerShown: false,
      }

https://reactnavigation.org/docs/stack-navigator#headershown

https://github.com/react-navigation/react-navigation/commit/ba6b6ae025de2d586229fa8b09b9dd5732af94bd

Old answer

I use this to hide the stack bar (notice this is the value of the second param):

{
    headerMode: 'none',
    navigationOptions: {
        headerVisible: false,
    }
}

When you use the this method it will be hidden on all screens.

In your case it will look like this:

const MainNavigation = StackNavigator({
  otp: { screen: OTPlogin },
  otpverify: { screen: OTPverification },
  userVerified: {
    screen: TabNavigator({
    List: { screen: List },
    Settings: { screen: Settings }
   }),
 }
},
{
  headerMode: 'none',
  navigationOptions: {
    headerVisible: false,
  }
 }
);