1.建立Schema

var schema = new mongoose.Schema({
        userName:{type:String,require:true},
        age:{type:Number,require:true},
        hasCard:false
})

2.建立model

var User = mongoose.model("user",schema);

3.在app.get()中呼叫查詢方法find()

app.get("/data",function(req,res){
     User.find({},
 
function(err,doc){
         if(err){
            console.log(err);
            
         }else{
             res.json(doc);
             
         }
     });
});