node_modules/mongoose/examples/geospatial/geoJSONSchema.js

// import the necessary modules
var mongoose = require('../../lib');
var Schema = mongoose.Schema;

// create an export function to encapsulate the model creation
module.exports = function() {
  // define schema
  // NOTE : This object must conform *precisely* to the geoJSON specification
  // you cannot embed a geoJSON doc inside a model or anything like that- IT
  // MUST BE VANILLA
  var LocationObject = new Schema({
    loc: {
      type: {type: String},
      coordinates: []
    }
  });
  // define the index
  LocationObject.index({loc: '2dsphere'});

  mongoose.model('Location', LocationObject);
};