Receiving Data from Mongodb using Mongoose

Question

Can we retrieve data from Mongodb using Mongoose if data has not been entered using Mogoose. Because data is manually entered in the Mongodb database. Currently I am trying to retrieve data using MongooseModel.findOne() method but its not finding the required data.

My Mongoose Model is this:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var mongooseUniqueValidator = require('mongoose-unique-validator');

var schema = new Schema({    
    email: {type: String, required: true, unique: true},   
    password: {type: String, required: true}
});

schema.plugin(mongooseUniqueValidator);

module.exports = mongoose.model('User', schema);

Database name: test-mean

Collection name: user

This is my post route that in which I am using Mongoose to retrieve data.

router.post('/signin', function(req, res, next) {
  User.findOne({email: req.body.email}, function(err, user) {
      if (err) {
          return res.status(500).json({
              title: 'An error occurred',
              error: err
          });
      }
      if (!user) {
          return res.status(401).json({
              title: 'User Login failed',
              error: {message: 'Invalid login credentials'}
          });
      }
      if (req.body.password != user.password) {          
          console.log('user password ' + user.password);
          console.log('request body password ' + req.body.password);
          return res.status(401).json({
              title: 'Password Login failed',
              error: {message: 'Invalid login credentials'}
          });
      }
      var token = jwt.sign({user: user}, 'secret', {expiresIn: 7200});
      res.status(200).json({
          message: 'Successfully logged in',
          token: token,
          userId: user._id
      });
  });
});

Please help. Thanks