I am having trouble installing npm and have broken everything - node.js

Question

Hello again to the whole community, I am trying after having deleted the package.json and node_modules several times to reinstall npm in my project but it doesn't work for me in any way.
When I do npm install literally nothing happens, but when I do npm run dev it throws the following error:
tom#tom-CR62-7ML:/var/www/html/Proyectos/clinic$ npm run dev
> # dev /var/www/html/Proyectos/clinic
> npm run development
> # development /var/www/html/Proyectos/clinic
> mix
sh: 1: mix: not found
npm ERR! Linux 4.15.0-135-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "run" "development"
npm ERR! node v8.10.0
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! # development: `mix`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the # development script 'mix'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! mix
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /var/www/html/Proyectos/clinic/npm-debug.log
npm ERR! Linux 4.15.0-135-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "run" "dev"
npm ERR! node v8.10.0
npm ERR! npm v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! # dev: `npm run development`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the # dev script 'npm run development'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! npm run development
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /var/www/html/Proyectos/clinic/npm-debug.log
If any expert can help me on the subject, I would be grateful since I have been dealing with this for several hours. Thank you!
I add my package.json file
{
"name": "clinic",
"version": "1.0.0",
"description": "<p align=\"center\"><img src=\"https://raw.githubusercontent.com/laravel/art/master/logo-lockup/5%20SVG/2%20CMYK/1%20Full%20Color/laravel-logolockup-cmyk-red.svg\" width=\"400\"></p>",
"main": "webpack.mix.js",
"directories": {
"test": "tests"
},
"scripts": {
"test": "dev"
},
"repository": {
"type": "git",
"url": "git+https://github.com/Code1995Tom/clinic.git"
},
"author": "",
"license": "ISC",
"bugs": {
"url": "https://github.com/Code1995Tom/clinic/issues"
},
"homepage": "https://github.com/Code1995Tom/clinic#readme"
}