ng serve Port 4200 is already in use

[a-korzhov]

🐞 Bug report

Command (mark with an x)

ng serve --open --port XXXX says error:
Port XXXX is already in use. Use '--port' to specify a different port.
in cmd "netstats" that ports are not used.

Description

Using Intellij Idea.
Its just simple AngularCLI application without additional code.
Just starting npm install -g @angular/cli@1.7.4
and ng new angularclient
Trying to make application Spring Boot + Angular - https://www.baeldung.com/spring-boot-angular-web

After i tried to make another Angular project without backend, just used WebStorm -> AngularCLI -> node v10.16.3. I have got the same error

🔥 Exception or Error

> frontend@0.0.0 start C:\Users\korzh\Programming\Java\Study\Spring\FullStack\frontend
> ng serve

Port 4200 is already in use. Use '--port' to specify a different port.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! frontend@0.0.0 start: `ng serve`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the frontend@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\korzh\AppData\Roaming\npm-cache\_logs\2019-08-18T18_40_28_465Z-debug.log

my project structure first time(when i Did Angular and Spring in 1 project).
-angularclient: e2e, node_modules, src, angular-clie.json, other files...
-src: main->java, resources->static, templates, application.properties; test
pom.xml

When i did it in Intellij in Spring project, my .angular-cli-json -> "$schema": "./node_modules/@angular/cli/lib/config/schema.json", was saying "node_modules not found",
deleted "./", alt+enter on node_modules and its creating package in src/main/resources/static/node_modules. When i tried to move all my angularclient project to "static" - not working.

If it securaly i can share what is in C:\Users\korzh\AppData\Roaming\npm-cache_logs\2019-08-18T18_40_28_465Z-debug.log
Anything else relevant?

[michalstepien]

It is bug in portfinder

[michalstepien]

@angular\cli\utilities check-port.js

[a-korzhov]

Did you try killing the port??

did you reac that i have no potrs to kill?
I`ve cloned hello world project from github (dont remember which one), and it works.
There was 7.2.0 versions in package.json dependencies, in my project was 5.x.x versions. Could it be reason of error?

[michalstepien]

@korzh17 do you have webpack-dev-server in package.json?

[michalstepien]

I've added to my packege.json portfinder": "~1.0.20" and change package-lock.json portfinder to ,
"portfinder": {
"version": "1.0.20",
"resolved": "https://registry.npmjs.org/portfinder/-/portfinder-1.0.20.tgz",
"integrity": "sha512-Yxe4mTyDzTd59PZJY4ojZR8F+E5e97iq2ZOHPz3HDgSvYC5siNad2tLooQ5y5QHyQhc3xVqvyk/eNA3wuoa7Sw==",
"requires": {
"async": "^1.5.2",
"debug": "^2.2.0",
"mkdirp": "0.5.x"
}
},

and works

[hoacodai000]

Reason: node-portfinder > v1.0.21.
Fix: in package.json
add => "portfinder": "1.0.20"
"dependencies": {
"@angular/animations": "~8.2.0",
"@angular/common": "~8.2.0",
"@angular/compiler": "~8.2.0",
"@angular/core": "~8.2.0",
"@angular/forms": "~8.2.0",
"@angular/http": "~7.2.15",
"@angular/platform-browser": "~8.2.0",
"@angular/platform-browser-dynamic": "~8.2.0",
"@angular/router": "~8.2.0",
"core-js": "^3.1.4",
"rxjs": "~6.5.2",
"zone.js": "~0.10.1",
"portfinder": "1.0.20"
}

[clydin]

Version 1.7.4 is no longer supported. Please update to a newer version (8.2.2 is the latest stable version). If the problem persists please file a new issue.

[a-korzhov]

thanks

[jebali-f]

I had the same problem, all ports are refused.
Here are the steps to fix it:

• add portfinder in the devDependencies block
  "devDependencies": {
  "portfinder": "1.0.20",
  }
• Remove node_modules
• clear the cache
• run npm install

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}