npm not working after clearing cache - node.js

Question

Before clearing cache
npm cache clear
npm is working fine. After clearing cache, it is not working.
The error log below suggest problem with internet connectivity but internet connection is just fine.
This problem does not only happen for bower but for any modules.
Here's the output of process:
> sudo npm install -g bower Password: npm http GET
> https://registry.npmjs.org/bower npm http GET
> https://registry.npmjs.org/bower npm http GET
> https://registry.npmjs.org/bower npm ERR! network connect ETIMEDOUT
> npm ERR! network This is most likely not a problem with npm itself npm
> ERR! network and is related to network connectivity. npm ERR! network
> In most cases you are behind a proxy or have bad network settings. npm
> ERR! network npm ERR! network If you are behind a proxy, please make
> sure that the npm ERR! network 'proxy' config is set properly. See:
> 'npm help config'
>
> npm ERR! System Darwin 12.5.0 npm ERR! command
> "/usr/local/Cellar/node/0.10.16/bin/node" "/usr/local/bin/npm"
> "install" "-g" "bower" npm ERR! cwd /Users/username npm ERR!
> node -v v0.10.16 npm ERR! npm -v 1.3.8 npm ERR! syscall connect npm
> ERR! code ETIMEDOUT npm ERR! errno ETIMEDOUT npm ERR! npm ERR!
> Additional logging details can be found in: npm ERR!
> /Users/username/npm-debug.log npm ERR! not ok code 0

Answer 1

This worked for me:
npm cache clean --force

Answer 2

It should be
npm cache clean
See https://docs.npmjs.com/cli/cache.html

Answer 3

"As of npm#5, the npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid. If you want to make sure everything is consistent, use
npm cache verify
instead."

Answer 4

try this one
npm cache clean --force
after that run
npm cache verify

Answer 5

Try npm cache clean --force if it doesn't work then manually delete %appdata%\npm-cache folder.
and install npm install npm#latest -g
It worked for me.
visit this link

Answer 6

I try to
npm cache clean
But npm said newer version on npm (> 5) has self healing Mechanism
and every thing i need to do for checking npm is use verify
npm cache verify
npm message :
The npm cache self-heals from corruption issues and data extracted from the cache is guaranteed to be valid.
If you want to make sure everything is consistent, use 'npm cache verify' instead.
but for forcing npm use this:
npm cache clean --force

Answer 7

Try npm cache clean --force if it doesn't work then manually delete %appdata%\npm-cache folder.

Answer 8

Environment path may have been removed.
Check it by typing,
npm config get prefix
This must be the location where the npm binaries are found.
In windows, c:/users/username/AppData/Roaming/npm is the place where they are found.
Add this location to the environment variable. It should work fine.
(Control Panel -> Search for 'Environment Variables' and click on a button with that name -> edit Path -> add the above location)

Answer 9

at npm#6.8.0 the command that is been supported is npm cache verify

Answer 10

I solved this issue by running cmd as an administrator.
before that, I was trying to run in vs code.
run it in Power Shell or Cmd with administrative privilege. I hope that it will help.
npm install –g #angular/cli#latest

Answer 11

npm cache clean --force
or
npm cache clean
after that run
npm cache verify

Answer 12

npm install --cache /tmp/empty-cache

Answer 13

rm C:\Users\<User>\AppData\Local\npm-cache\