Node/Express app hangs whenever interfacing with MongoDB, no errors given - node.js

Question

I'm trying to create a CRUD REST API in NodeJS, Express, and Mongodb.
I did something to break all my routes where they no longer return responses. No errors, nothing in the console, etc. I'm not sure what happened, I had it working before. Through just some console.logs I figured out it was freezing whenever it interfaced with the database.
Now, when I send a post request in Postman, it just hangs with 'Loading request'. I'm sending my request as a raw JSON in the body and a content type of application/json; charset=UTF-8 in the header.
{"username":"zezimaUsername","rsn":"Zezima","avatar":"http://secure.runescape.com/m=avatar-rs/Zezima/chat.png"}
They seem to all be hanging once they interact with Mongodb. I have Mongodb running locally with the mongod --port 27017 and created my database with two collections (user and posts) in Mongodb Compass.
I setup my db in a db.js file...
var mongoose = require('mongoose');
var url = 'mongodb://localhost:27017/my-group';
mongoose.connect(url);
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error: '));
module.exports = db;
And start my app with my server.js...
var express = require('express');
var api = require('./api');
var app = express();
app.use(express.json());
app.use('/api', api);
//Error handling, don't return stack trace to user, log in console.
app.use(function (err, req, res, next){
console.log(err.stack);
res.status(500).send('Something went wrong, internal server error.');
});
app.listen(3000, function(){
console.log("Listening on port 3000");
});
And define my routes in my api.js file...
var express = require('express');
var router = express.Router();
var User = require('./db/models/User');
var Post = require('./db/models/Post');
router.post('/register', function(req, res){
var user = new User(req.body);
user.save()
.then(function(item){
res.status(200).send({message: "User successfully created.", status: 200});
})
.catch(function(err){
res.status(400).send({message: "User failed to save to database", status: 400});
});
});
router.get('/user/:username', function(req, res){
var query = User.findOne({"username": req.params.username});
query.exec(function(err, user){
if(user === null){
res.status(404).send({message: "User not found", status: 404});
}else{
res.status(200).send(user);
}
});
});
router.post('/create_post', function(req, res){
var post = new Post(req.body);
post.save()
.then(function(item){
res.status(200).send({message: "Post successfully created.", status: 200});
})
.catch(function(err){
console.log(err);
res.status(400).send({message: "Post failed to save to database", status: 400});
});
});
router.get('/post/id/:id', function(req, res){
var query = Post.findOne({"_id":req.params.id});
query.exec(function(err, post){
if(post === null){
res.status(404).send({message: 'Post not found', status: 404});
}else{
res.status(200).send(post);
}
});
});
router.get('/post/boss/:boss', function(req, res){
var query = Post.find({"boss":req.params.boss});
query.exec(function(err, post){
if(post === null){
res.status(404).send({message: 'Post not found', status: 404});
}else{
res.status(200).send(post);
}
});
});
module.exports = router;
And just to be complete...my models look like...
User.js
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var userSchema = new Schema({
username:{
type: String,
required: true
},
rsn:{
type: String,
required: true
},
avatar:{
type: String,
required: true
},
posts:[{
type: Schema.Types.ObjectId,
ref: 'posts'
}]
});
var user = mongoose.model('users', userSchema);
module.exports = user;
and Post.js
var mongoose = require('mongoose');
var shortid = require('shortid');
var Schema = mongoose.Schema;
var postSchema = new Schema({
_id:{
type: String,
default: shortid.generate
},
username:{
type: Schema.Types.ObjectId,
ref: 'users'
},
rsn:{
type: String,
required: true
},
avatar:{
type: String,
required: true
},
boss:{
type: String,
required: true
}
});
var post = mongoose.model('posts', postSchema);
module.exports = post;
I'm not sure what's happening, I keep reading a bunch of various tutorials and the documentation but I'm just not seeing the issue I'm having.

Answer 1

You have not required your db.js file in your server.js file.
Require it after var express = require('express');
let db = require("./db");
Then it will work fine.