Nativescript Vue Developer Tools not working

vue.js nativescript nativescript-vue vue-devtools

Device and development computers must be in the same network.

So you need to check if your emulator has a correct connection.

10.0.2.2 is a special alias to your host loopback interface (i.e., 127.0.0.1 on your development machine)

Communication with the emulated device may be blocked by a firewall program running on your machine.
Communication with the emulated device may be blocked by another(physical) firewall/router to which your machine is connected.Check your devices withtns device and adb devices then ping to their IP or telnet localhost 5554

Your host computers local IP address can be different but just use 10.0.2.2

Vue.use(VueDevtools, { host: '10.0.2.2' })