I&#39;m learning NodeJs.

To connect to and use MongoDB from NodeJS, I see a lot of examples using either Monk or Mongoose.

Are these two libraries equivalent ? Do they have the same features or do they each have a specific purpose ? 

As a beginner with NodeJS, which should I use ?

Here are some examples of code that uses Monk : 

    var mongo = require(&#39;mongodb&#39;);
    var monk = require(&#39;monk&#39;);
    var db = monk(&#39;localhost:27017/nodejsapp&#39;);

    ----
    exports.userlist = function(db) {
        return function(req, res) {
            var collection = db.get(&#39;users&#39;);
            collection.find({},{},function(e,docs){
                res.render(&#39;userlist&#39;, {
                    &quot;userlist&quot; : docs
                });
            });
        };
    };

and here a sample that uses Mongoose :

       var mongoose = require(&#39;mongoose&#39;);
    ----
     mongoose.connect(&#39;localhost&#39;, &#39;test&#39;);
     var db = mongoose.connection;
      db.on(&#39;error&#39;, console.error.bind(console, &#39;connection error:&#39;));
      db.once(&#39;open&#39;, function callback() {
       console.log(&#39;Connected to DB&#39;);
    });

    // User Schema
    var userSchema = mongoose.Schema({
       username: { type: String, required: true, unique: true },
       email: { type: String, required: true, unique: true },
      password: { type: String, required: true},
    });

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monk vs mongoose for Mongodb