node.js - Parsing postdata value in nodejs -

i have post data in format below

authinfo={"user":"1","password":"a"} 

how key ie authinfo. stuck here! req.query did not work out. appreciated.

data transmitted via post found in req.body.

for example:

req.body.authinfo

also: need data parser enabled, otherwise post data not decoded. assume use express, need app.use(express.bodyparser()).