503 service temporarily unavailable code example

Example 1: npm err! 503 service unavailable proxy

first add this:
- npm config set registry http://registry.npmjs.org/

If your organization use proxy , add proxy :

- npm config set proxy "http://username:password@proxy-url:proxy-port"

- npm config set https-proxy "http://username:password@proxy-url:proxy-port"

Example 2: error 503 service unavailable

A 503 Service Unavailable Error is an HTTP response status code indicating 
that a server is temporarilyunable to handle the request. This may be due 
to the server being overloaded or down for maintenance. This particular 
response code differs from a code like the 500 Internal Server Error we 
explored some time ago.