NodeJS: any module to limit express request rate [closed]

Question

one of my friend is looking for nodejs module:

• can limit express request rate.
• to prevent robots.

had google, but only found connect has a limit middleware but only limit file size.

Answer 1

Update:

I did multiple searches(also searched npmjs.org):

• http://www.google.com/search?q=rate+limit+http+firewall&hl=en
• http://www.google.com/search?q=rate+limit+http+iptables&hl=en
• http://www.google.com/search?q=connect+node.js+limit+request+rate&hl=en -> http://journal.paul.querna.org/articles/2010/09/04/limiting-concurrency-node-js/
• https://npmjs.org/browse/keyword/rate -> https://npmjs.org/package/rate-limiter && https://npmjs.org/package/express-rate

---

Just did some Google searching with hopefully a solution:

• http://www.debian-administration.org/articles/187
• http://journal.paul.querna.org/articles/2010/09/04/limiting-concurrency-node-js/
• https://github.com/jhurliman/node-rate-limiter
• https://npmjs.org/package/express-rate
• https://github.com/cloudkick/rate-limiter
• https://npmjs.org/package/express-rate
• https://npmjs.org/package/limiter