React native change listening port

Question

I am using react native android and having face issues to deploy the app on an android device. When I run

react-native start, it won\'t start dev server

Answer 1

I know it is late but FYI, there is also another way where you can change your port permanently.

Go to your_app\node_modules\react-native\local-cli\server\server.js and change the port 8081 to 8088

which will be something like this

    ...
      module.exports = {
      name: 'start',
      func: server,
      description: 'starts the webserver',
      options: [{
        command: '--port [number]',
        default: 8088,
        parse: (val) => Number(val),
      }
     ...

UPDATE TESTED ON RN 0.57:
1. If you are using custom metro config

const config = {
  ...
  server: {
    port: 8088,
  }
  ...
};

2. And if you are not then,
Go to your_app\node_modules\react-native\local-cli\util\Config.js

const Config = {
   ...
   server: {
      port: process.env.RCT_METRO_PORT || 8088 //changed from 8081
   }
   ...
}