How to find search/find npm packages
npm search works pretty well:
npm search connect
npm view will show you the timestamp of each version and everthing else from package.json (including node version)
npm view connect
There's nipster too, based on npm + github rating.
Libraries.io is great for searching and filtering through NPM modules, you can also filter by license and keyword: https://libraries.io/search?platforms=NPM
For me the best site for this purpose is Openbase:
https://openbase.com/
By VERY far. It's stats and features are, AFAIK, unmatched by any other site.