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 on port 8081 I have tried a few options mentioned at: https://reactnative.dev/docs/troubleshooting Tried to stop the process running at port number 8081, but no success My question is that can we change the React Native dev server port from 8081 (which is a default in android however the same we can change in ios from AppDelegate.m file) to something else or any other approach Your responses will be highly appreciated. Thanks

reactjsreact-native

vikram jeet singh

Reputation: 3516

React native change listening port

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 on port 8081

I have tried a few options mentioned at:

https://reactnative.dev/docs/troubleshooting
Tried to stop the process running at port number 8081, but no success

My question is that can we change the React Native dev server port from 8081 (which is a default in android however the same we can change in ios from AppDelegate.m file) to something else or any other approach

Your responses will be highly appreciated. Thanks

Upvotes: 62

Answers (18)

Abhimanyu Patil

Reputation: 128

If using yarn-

 yarn start --port your port name   // worked for me.

Eg:-

yarn start --port 8082

Upvotes: 1

Ashif AL

Reputation: 539

Solution:

If you are using npm :-

 npm start --port your port name   // worked for me.

Eg:-

npm start --port 8080

If you are using yarn :-

yarn start --port your port name   // worked for me.

Eg:-

yarn start --port 3000

Upvotes: 1

JimA

Reputation: 41

(Tested on RN 0.72.5) For iOS, add this to Podfile:

post_install do |installer|
...

# Port fix for metro bundler so when we run 'react-native run-ios --port XXXX' it will use the right port XXXX in Metro server and from the client app
installer.pods_project.build_configurations.each do |config|
  config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'].insert(0, "RCT_METRO_PORT=${RCT_METRO_PORT}")
end

...
end

Upvotes: 0

Shubham

Reputation: 61

For windows

correct way is to go to root directory and follow instructions

run cmd as administrator run npm start -- --port=8888

then open another md as administrator in root dir run npm run android -- --port=8888

Upvotes: 0

AmerllicA

Reputation: 32472

Actually, in the current version of React Native, configs of metro bundler are in the @react-native-community/cli and for changing the default PORT of metro bundler we should change the default PORT just by export an environment variable by the following command inside the project path:

export RCT_METRO_PORT=8590

Then in the ios folder of your project find the Pods folder and inside the Pods folder seek RCTDefines.h files, there are two of them, inside both of them change the 8081 to 8590.

Surely, for a test we can run the echo $RCT_METRO_PORT and if you see the new PORT 8590, it is changed now and we can run our project with default commands like yarn start and then yarn ios or yarn android.

Hint: for connecting to the React Native Debugger press ⌘+t and change the 8081 port to 8590.

Upvotes: 3

Alex Fox

Reputation: 1225

You need to overwrite the RCT_METRO_PORT macro variable to ensure your app points to the correct port when running via xcode or react-native run-ios. This can be done by opening the Pods project within your workspace, navigating to Build Settings and adding a Preprocessor Macro. For example RCT_METRO_PORT=7777, if the port you are using is 7777.

Upvotes: 5

Rahul Kumar

Reputation: 3157

run metro-bundler server with specified port eg. "8089"

react-native start --port 8089

build iOS and Android package which listens to above port

iOS:. react-native run-ios --port 8089 --simulator \"iPhone 8\"

Android: react-native run-android --port 8089

Change the server and port number in Dev-settings after launching the app on simulator or device.

iOS: Command + D in Mac and Ctrl + D in windows
- Click on Configure Bundler option
- provide host as localhost and port as 8089 then apply changes
Android: Command + M in Mac and Ctrl + M in windows
- Click on Change Bundle Location
- change it to localhost:8089 then press ok

Upvotes: 16

Gurunath Sripad

Reputation: 1398

After spending a whole day and going through many solutions, a combination of the suggestions helped me resolve this. Follow the steps given below:

Create the project using the command: 'react-native init [PROJECT_NAME]'
Open the project in Xcode and replace all occurrences of "8081" with "8088" and save the changes
Open terminal and change the working directory to the above created project directory. Use the following command to change the port that react native uses: react-native start --port 8088

Once you run this command, you see the following output in the terminal:

As you can see, this starts the Metro instance. Do not kill the command or the terminal window. Let this process run.

Open a new terminal window, change the working directory to the project directory and run the react-native project using the command:

react-native run-ios

Once the project builds successfully on the second terminal, you will see a progress bar indicating the loading of the app bundle in the first terminal window as shown below:

On completion of loading the bundle, the app succesfully launches on the simulator

Hope this helps. Happy coding

Upvotes: 4

刘德苏

Reputation: 76

When you excute command like

./node_modules/react-native/scripts/launchPackager.command

to start a debug server,append args like

---port 8082

it works for me in React native 0.53.3.

Upvotes: 0

Shyam Pratap Singh

Reputation: 161

If you want to change the port other than 8081 and running the same in emulator, i think this link has better working solution : https://medium.com/@hsuastegui/use-react-native-in-a-different-port-1109db5674d8

Upvotes: 0

youngjuning

Reputation: 59

/**
 * Metro configuration for React Native
 * https://github.com/facebook/react-native
 *
 * @format
 */

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: false,
      },
    }),
  },
  server: {
    port: 8088,
  },
}

Upvotes: 3

Bagusflyer

Reputation: 12915

The simplest solution is:

The below command will build Android or iOS package which will listen to port 1234

For iOS: react-native run-ios --port=1234

For Android react-native run-android --port=1234

If you are using metro-server then you can add port under server object like :

server:{ port:1234 }

run

react-native start --port=1234

Find out more configuration for metro-server here: https://facebook.github.io/metro/docs/en/configuration

But requires 0.55 and above.

Upvotes: 13

Neel Gala

Reputation: 2400

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
   }
   ...
}

Upvotes: 17

patrick

Reputation: 6840

Not sure if this is documented or not[1], you can specify the port via a CLI argument, like this:

react-native start --port 9988

I found it in the source code, and it worked on my local machine :)

https://github.com/facebook/react-native/blob/master/local-cli/server/server.js#L30

[1] This is now documented here: https://facebook.github.io/react-native/docs/troubleshooting#using-a-port-other-than-8081

Upvotes: 99

blcsntb

Reputation: 409

export RCT_METRO_PORT=8082
react-native start --port $RCT_METRO_PORT
react-native run-ios

https://facebook.github.io/react-native/docs/troubleshooting#using-a-port-other-than-8081

Upvotes: 2

user1719079

Reputation: 1

Follow the steps :

Step 1:

vim node_modules/react-native/local-cli/server/server.js

Step 2 : change the default port - any other port //example -> 8089

Step 3 : go back to the project -> and do npm start

Upvotes: 0

vinodk

Reputation: 829

Set RCT_METRO_PORT, example:

export RCT_METRO_PORT=8765

Upvotes: 2

Shivani Kumar

Reputation: 11

You can use this react-native-port-patcher which replaces the default 8081 port with your desired port number.

Upvotes: 0

React native change listening port

Answers (18)

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