freeCodeCamp/seed_data/seed.js

require('dotenv').load();
var Challenge = require('../models/Challenge.js'),
    Bonfire = require('../models/Bonfire.js'),
    mongoose = require('mongoose'),
    secrets = require('../config/secrets'),
    challenges = require('./challenges.json'),
    bonfires = require('./bonfires.json');

mongoose.connect(secrets.db);

Challenge.remove({}, function(err, data) {
    if (err) {
      console.error(err);
    } else {
      console.log('Deleted ', data);
    }
    Challenge.create(challenges, function(err, data) {
        if (err) {
          console.log(err);
        } else {
            console.log('Saved ', data);
        }
    });
});

Bonfire.remove({}, function(err, data) {
    if (err) {
        console.error(err);
    } else {
        console.log('Deleted ', data);
    }
    Bonfire.create(bonfires, function(err, data) {
        if (err) {
            console.log(err);
        } else {
            console.log('Saved ', data);
        }
    });
});