Could not connect to development server. Ensure node server is running

[lealife]

I run the 2048 example on Xcode and run the IOS simulator, an error occurs:

[amasad]

Did you try running npm start from react-native directory?

[tehfailsafe]

I get this error as well when I try to run on real ios device through xcode. Is that expected?

[meetwudi]

Run npm start on local machine to start the development server. React Native relies on a development server to communicate with the app running in the simulator.

[lealife]

Ok, I will try it, I see the AppDelegate.m :

 // Loading JavaScript code - uncomment the one you want.

  // OPTION 1
  // Load from development server. Start the server from the repository root:
  //
  // $ npm start
  //
  // To run on device, change `localhost` to the IP address of your computer, and make sure your computer and
  // iOS device are on the same Wi-Fi network.

Maybe you should write it in a wiki(How to run examples ?). It's easy to freshman.

[jaichandra]

I see this error even after running 'npm start'. Do I need to make any changes to AppDelegate.m file?

[jaichandra]

OK. fixed the issue. I had to change the port from 8081 to 8881 as the default port is used by another process on my mac. Modifying AppDelegate.m to point to the new port worked.

  // OPTION 1
  // Load from development server. Start the server from the repository root:
  //
  // $ npm start
  //
  // To run on device, change `localhost` to the IP address of your computer, and make sure your computer and
  // iOS device are on the same Wi-Fi network.
  jsCodeLocation = [NSURL URLWithString:@"http://localhost:8881/index.ios.bundle"];

[ikallen]

where is react-native directory?

[brownieboy]

@ikallen

The "react-native directory" refers to the folder where your own source-code is located.

[wongzigii]

I think "react-native root" within the error could be more clear which just as @brownieboy said, refers to the folder where the source code located.

[MilanPalSingh]

It worked for me -> open the APP folder in the terminal and running "react-native start". Here you can also check on which port it is running and set the same.

[jamesfzhang]

I can load this URL just fine in my browser: http://localhost:8081/index.ios.bundle?platform=ios&dev=true but I still get this error. My AppDelegate appears like so:

let jsCodeLocation = NSURL(string: "http://localhost:8081/index.ios.bundle?platform=ios&dev=true")
let rootView = RCTRootView(bundleURL: jsCodeLocation, moduleName: "App", initialProperties: nil, launchOptions: launchOptions)
let rootViewController = ViewController()
rootViewController.view = rootView
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.rootViewController = rootViewController
self.window?.makeKeyAndVisible()
return true