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npm audit

 === npm audit security report ===


 Manual Review
 Some vulnerabilities require your attention to resolve

 Visit https://go.npm.me/audit-guide for additional guidance

High Missing Origin Validation

Package webpack-dev-server

Patched in >=3.1.6

Dependency of laravel-mix [dev]

Path laravel-mix > webpack-dev-server

More info https://nodesecurity.io/advisories/725

found 1 high severity vulnerability in 11710 scanned packages
1 vulnerability requires manual review. See the full report for details.

How to fix this i cannot use laravel
whenever i try run command "npm run dev" it shows several problem

This audit is just pointing out a vulnerability in your version of the webpack-dev-server package.

I don't think it's related to the other problems you're encountering when you run npm run dev as I'm currently using a vulnerable version of the same package in my dev environment as well and it works fine.

If you're using laravel mix, it is dependent on a vulnerable version of webpack-dev-server (2.11.1) so you can't really fix this problem and will see this annoying audit message until laravel mix is updated to use a newer, secure version.

Quick solution:

Turning off npm audit on package installation
https://docs.npmjs.com/auditing-package-dependencies-for-security-vulnerabilities

Maybe you must wait to update laravel-mix.
Ref link: https://github.com/JeffreyWay/laravel-mix/issues/1809
Because version of webpack-dev-server < 3.1.6 in laravel-mix.