I'm new on Node.js and Express and now I'm observing that when I change the method on my calling app the params are in req.param([name]), req.body.[name] or req.query and it depends by the method.Now my questions are two:Are there some differences between these three objects? (something that could explain why a different method refill a different object)Is there some problems if I create a function/module that simple check which is full and, for example, modify the req.body object so I can call this object every time to retrieve the parameters?EDIT:After @jfriend00 's answer I would explain better my dilemma:I'm developing an api and I would create a module that could check data passed with the different methods, for now I writing something like:if(req.method== 'PUT' || req.method=='POST')    x=req.body.x;else    x=req.query.x;and I would do something at the beginning like:if(req.query!=null)    req.body=req.query;so, after, in all my checks I will control over req.body and not the others!Do you think that it is a bad practice?
Why do req.params, req.query and req.body exist?
node.js