node.js - req.query and req.param in ExpressJS

Question

Main differences between req.query and req.param in Express

• How are Both different from each other
• When to use then in what cases

Suppose a client sends say Android (Key,value) pair in the request ........ which one to use ?

[EDIT]

Suppose android sends a POST request -> Intention is to send (Key,Value) to client and the server should perform a database query based on the value in the server and return JSON response

Look:: at this question for the program i referenced:: Simple Express program for querying a result

Answer 1

req.query will return a JS object after the query string is parsed.

/user?name=tom&age=55 - req.query would yield {name:"tom", age: "55"}

req.params will return parameters in the matched route. If your route is /user/:id and you make a request to /user/5 - req.params would yield {id: "5"}

req.param is a function that peels parameters out of the request. All of this can be found here.

UPDATE

If the verb is a POST and you are using bodyParser, then you should be able to get the form body in you function with req.body. That will be the parsed JS version of the POSTed form.