# req Objects - req - req.body, req.queries, req.validationerrors - res.headers, req.users, req.file, req.assert - req.params, req.checkbody #res Objects - res.send, res.end, res.json, res.render, res.status, res.sendStatus # - .limit(4) //limit only upto 4 docs - skips(3) //skip first 3 docs - exe //query build and then execute, it is also callback function of mongoose. - sort({_id: -1}) //for decending order - populate('userId') //populating data inside the reference.
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