npm install not installing any packages - gruntjs

Question

Im trying to test an old project, and when i run npm install, all i get is:
npm WARN package.json xx# No repository field.
npm WARN package.json xx# No license field.
My package.json file looks like this:
{
"name": "xx",
"version": "",
"dependencies": {},
"devDependencies": {
"connect-livereload": "~0.3.2",
"grunt": "~0.4.1",
"grunt-bg-shell": "~2.3.1",
"grunt-contrib-csslint": "^0.2.0",
"grunt-contrib-sass": "^0.8.1",
"grunt-contrib-uglify": "^0.6.0",
"grunt-contrib-watch": "~0.5.3",
"grunt-newer": "^0.8.0",
"grunt-ngrok": "^0.2.2",
"load-grunt-tasks": "~0.2.1",
"time-grunt": "~0.2.7"
},
"engines": {
"node": ">=0.8.0"
}
}
I havent run this kind of install in a while and im afraid im forgetting something, any ideas as to what ?
EDIT: it turns out the folder copy i had of the project had already a node_modules folder with everything installed, reason why running npm install wasnt doing anything. Although i thought there would be some kind of warning or message saying all modules are installed already.

Answer 1

Getting the warning is not a concern. If you can see a structure of npm packages being installed after the warning, then it works fine. In case you want to avoid these warning, you can add respository and license fields to your package.json.
"repository": {
"type": "git",
"url": "git://github.com/user/repo.git"
},
"license": "ISC"

Answer 2

You are missing a bracket from the end
{
"name": "xx",
"version": "",
"dependencies": {},
"devDependencies": {
"connect-livereload": "~0.3.2",
"grunt": "~0.4.1",
"grunt-bg-shell": "~2.3.1",
"grunt-contrib-csslint": "^0.2.0",
"grunt-contrib-sass": "^0.8.1",
"grunt-contrib-uglify": "^0.6.0",
"grunt-contrib-watch": "~0.5.3",
"grunt-newer": "^0.8.0",
"grunt-ngrok": "^0.2.2",
"load-grunt-tasks": "~0.2.1",
"time-grunt": "~0.2.7"
},
"engines": {
"node": ">=0.8.0"
}
}
I sugges you to use npm init then install the packages by the cli-tool
for eg:
save to devDepencies
npm install connect-livereload grunt grunt-bg-shell ... --save-dev
save to depencies
npm install express ... --save
read more at: https://docs.npmjs.com/cli/install

Answer 3

It turns out the folder copy i had of the project had already a node_modules folder with everything installed, reason why running npm install wasnt doing anything. Although i thought there would be some kind of warning or message saying all modules are installed already.