Small function to describe mongoose schema.

describeSchema.js

const describeSchema = (obj) => {
  let describeSchema = {};

  for (const key of Object.keys(obj.schema.paths)) {
    describeSchema[key] = obj.schema.paths[key].instance;
  }
  return describeSchema;
};

module.exports = describeSchema;

// Usage:
// const describeSchema = require("./describeSchema");
// describeSchema(Mongoose.Model())
// Mongoose.Model() will be your defined mongoose model.