npm install error EACCES permission denied? - npm

Question

I have permission problem using npm.
When I write "npm install"
Error: EACCES: permission denied, mkdir '/ItsMe'
TypeError: Cannot read property 'get' of undefined
at errorHandler (/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:211:17)
at /usr/local/lib/node_modules/npm/bin/npm-cli.js:83:20
at cb (/usr/local/lib/node_modules/npm/lib/npm.js:215:22)
at /usr/local/lib/node_modules/npm/lib/npm.js:253:24
at /usr/local/lib/node_modules/npm/lib/config/core.js:81:7
at Array.forEach (native)
at /usr/local/lib/node_modules/npm/lib/config/core.js:80:13
at f (/usr/local/lib/node_modules/npm/node_modules/once/once.js:25:25)
at afterExtras (/usr/local/lib/node_modules/npm/lib/config/core.js:178:20)
at Conf.<anonymous> (/usr/local/lib/node_modules/npm/lib/config/core.js:235:20)
/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:211
if (npm.config.get('json')) {
^
TypeError: Cannot read property 'get' of undefined
at process.errorHandler (/usr/local/lib/node_modules/npm/lib/utils/error-handler.js:211:17)
at emitOne (events.js:96:13)
at process.emit (events.js:191:7)
at process._fatalException (bootstrap_node.js:304:26)
With a "ls -l" I have rwx rights.
I don't understand what "Cannot read property 'get' of undefined" means.
I searched on the web and tried several things but it' doesn't work.
Could you help me ?
Thank you

Answer 1

Your npm install try to do an mkdir in a file you don't have access to. Try to give him the right by doing
sudo npm install
or doing it as a super user (I dont recomand that) You also asked what npm install do without argument. Well if ou don't specify a folder it creates the folder node_module (that is why it does an mkdir). If you don't precise a module it will install all the module from package.json. It can take morte time and you will have a lots of package you won't need but with that you will be sure to have the one you want.
You can choose the package you want if you exactly know wich one. ie :
npm install sax#latest
the latest mean it gonna search for the last existing package
ANd you can also install a package you downloaded yourself. ie :
npm install ./package.tgz