MangaDB: Manga Schema

manga.js

// ./models/manga.js
// Load required packages
var mongoose = require('mongoose');

// Define our user schema
var MangaSchema = new mongoose.Schema({
  title: {
    type: String, //It has to be a string
    lowercase: true, // make it lowercase
    trim: true, // removes trailing white spaces
    required: true, //cannot be empty
    unique: true, //no similar data on the db
    match: /[a-z]/ // uses regex to ensures there are no numbers (2 !=="2")
  },
  categories: [{ // makes it an array
    ...
  }],
  chapter: {
    type: Number, //makes it to be a number
    min: 0, //ensures the minimum number is zero
    match: /[0-9]/ //regex to enforce numbers, probably not needed due to type.
  },
  userId: {
    ...
    match: /[a-z-0-9]+/ //basically makes it alphanumeric
  }
}).set('toObject', {
  retainKeyOrder: true
});

// Export the Mongoose model
module.exports = mongoose.model('Manga', MangaSchema);

Note that this is not the full file and is just a shortened version for education purposes, it does not work as it is.