I know that foreach in nodejs is blocking. I am developing a API Server in nodejs and I need to parse through req.body to produce some kind of signature to validate request. So my question is if I use forEach on req.body will it block other request? How to overcome it if it is blocking?
forEach is blocking, but for most use cases it's just fine, so long as your array.length * function.runTime isn't very large, which it shouldn't be unless you're doing IO or crypto. If you are doing something with a long run time you can then replace the forEach with an async.forEach (https://github.com/caolan/async)
i find async perfect for server-side short work - but if you want something much lighter and can deal with less polish you can adapt one of these: http://book.mixu.net/ch7.html
a lot faster from my experience...which is important when running on low-power embedded devices or low-end servers