npm.conf

proxy_cache_path /var/www/npm_cache levels=2:2 keys_zone=npm_cache:10m max_size=20g inactive=1M use_temp_path=off;

server {
  listen 80;
  server_name npm.example.com;

  location / {
    rewrite ^ https://npm.example.com$request_uri permanent;
  }
}

server {
  listen 443 ssl http2;
  server_name npm.example.com;

  ssl on;
  ssl_certificate /etc/nginx/ssl/npm.crt;
  ssl_certificate_key /etc/nginx/ssl/npm.key;

  access_log off;
  error_log /var/log/npm.error.log notice;

  location / {
    proxy_pass https://registry.npmjs.org;
    proxy_cache npm_cache;
    proxy_cache_lock on;
    proxy_cache_min_uses 1;
    proxy_cache_revalidate off;
    proxy_cache_use_stale error timeout invalid_header updating;
  }
}