How to set not to open new web browser tab in vscode when running asp.net core api project

Question

e.g

Every time i key ctrl + f5 or ctrl + shift + f5 to rerun asp.net core api project in vscode,it'll open a new tab.

I expect just restart program without opening new tab.

Answer 1

updated : CLI version (recommand)

It can use dotnet watch to do it .

visul studio code (op want to merge)

If you don't want any browser tab be created,you colud go to .vscode\launch.json remove serverReadyAction and it can deal the problem.

default json :

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
             "serverReadyAction": {
                 "action": "openExternally",
                 "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            }
        }
    ]
}

just delete or mark serverReadyAction then system'll not open any web browerser tab 🤗

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
            // "serverReadyAction": {
            //     "action": "openExternally",
            //     "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            //}
        }
    ]
}

---

P.S

I test set launchBrowser enabled false but it not work,it'll still create new tab.

launchBrowser enabled false launch.json :

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            "launchBrowser": {
                "enabled": false    
            },            
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            // If you have changed target frameworks, make sure to update the program path.
            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.0/ServerApp.dll",
            "args": [],
            "cwd": "${workspaceFolder}",
            "stopAtEntry": false,
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
            "serverReadyAction": {
                "action": "openExternally",
                "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            },
            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            },
            "sourceFileMap": {
                "/Views": "${workspaceFolder}/Views"
            }
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command:pickProcess}"
        }
    ]
}

---

Visual Studio Version :

Every kind of application shows you some kind of UI, prompt, or form. Otherwise, how would user know that’s its up and running.

By default, it’s open a new tab only.

Your project template itself is web API? then how can you expect the web without the browser?

Update: I tried setting the launchBrowser to false in launchSettings.json in Visual studio 2019, it’s launching like the below images.

"profiles": {
  "IIS Express": {
    "commandName": "IISExpress",
    "launchBrowser": false,
    "launchUrl": "default",
    "environmentVariables": {
      "ASPNETCORE_ENVIRONMENT": "Development"
    }
  }

You are setting launchBrowser to false in wrong way, you have to do like this "launchBrowser": false. Its working fine in Asp.Net Core 3.1 API.

You can see in the taskbar

Answer 2

If you don't want any browser tab be created,you colud go to .vscode\launch.json remove serverReadyAction and it can deal the problem.

default json :

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
             "serverReadyAction": {
                 "action": "openExternally",
                 "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            }
        }
    ]
}

just delete or mark serverReadyAction then system'll not open any web browerser tab 🤗

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
            // "serverReadyAction": {
            //     "action": "openExternally",
            //     "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            //}
        }
    ]
}

---

P.S

I test set launchBrowser enabled false but it not work,it'll still create new tab.

launchBrowser enabled false launch.json :

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            "launchBrowser": {
                "enabled": false    
            },            
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            // If you have changed target frameworks, make sure to update the program path.
            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.0/ServerApp.dll",
            "args": [],
            "cwd": "${workspaceFolder}",
            "stopAtEntry": false,
            //Enable launching a web browser when ASP.NET Core starts. For more information: https://aka.ms/VSCode-CS-LaunchJson-WebBrowser
            "serverReadyAction": {
                "action": "openExternally",
                "pattern": "\\bNow listening on:\\s+(https?://\\S+)"
            },
            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            },
            "sourceFileMap": {
                "/Views": "${workspaceFolder}/Views"
            }
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command:pickProcess}"
        }
    ]
}