Mongoose Model.find není funkce?

Váš export modulu je nesprávný

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var listSchema = new Schema({
    name: { type: String, default: datestring + " List" }
});

**mongoose.exports = mongoose.model('List', listSchema);** <!-- this is wrong -->

mělo by to být

**module.exports = mongoose.model('List', listSchema)**