node.js - error in json format in mongodb - 


var express=require('express'); var app=express(); var bodyparser=require('body-parser'); var mongoose=require('mongoose'); var createerror = require('http-errors')    app.use(bodyparser.json());    genre=require('./model/genre') book=require('./model/book')  //connect mongoose mongoose.promise = global.promise; mongoose.connect('mongodb://localhost/bookstore', { usemongoclient: true}); var db=mongoose.connection;    /*  "/api/books"  *    get: finds books  *    post: creates new book   */  app.get('/api/books',function(req,res){  book.getbook(function(err,book){  if(err){       throw err; //want error in json format  }   //json response show books in json format  res.json(book);     });   });          //connection mongodb localhost   app.listen(27017);    console.log('running on port 27017');    error is:     typeerror: book.getbook not function

please tell me how throw error in json format new mongodb..... using visual studio changes mongodb+node.js+express want error should display in json format....

ok here way throw error in json.

  app.get('/api/books',function(req,res,callback){     book.getbooks(function(err,book){      if(err){          res.status(404).send({ error: 'error in mongo of kalpita!' });            }else{           //json response show books in json format             res.json(book);            }         },10);       });

and add

book.find({},callback).limit(limit);

in model.


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