Trouble with MongoDB insert - angularjs

Question

Currently using MEAN in order to connect my AngularJS app to a database.
I have a button called "commit to database" that first clears the mongodb database, then inserts my array of data (stored in $scope.filterTable) into the database.
I then have a button called "load from database" that updates $scope.filtertable to match data from the database.
Half of the time when I click the "commit to database" button, my database is empty. Half of the time, it's filled with the data I expect it to have.
Anyone know what I'm doing wrong? Thanks!
Here's the code in my main AngularApp:
var commitToDatabase = function(){
deleteDatabase();
insertDatabase();
}
var insertDatabase = function(){
$http.post("/AngularApp", $scope.filterTable).success(function(response){
$http.get('/AngularApp').success(function(response) {
console.log(response);
});
});
}
var deleteDatabase = function(){
$http.delete('/AngularApp');
}
var loadFromDatabase = function(){
$http.get('/AngularApp').success(function(response) {
$scope.filterTable = response;
});
}
Here's the code in my server.js file:
var express = require("express");
var mongojs = require("mongojs");
var bodyParser = require("body-parser");
var app = express();
var db = mongojs("AngularApp", ["AngularApp"]);
app.use(express.static(__dirname + "/public"));
app.use(bodyParser.json());
app.get('/AngularApp', function (req, res) {
console.log('I received a GET request');
db.AngularApp.find(function (err, docs) {
console.log(docs);
res.json(docs);
});
});
app.post('/AngularApp', function (req, res) {
console.log("POST");
console.log(req.body);
db.AngularApp.insert(req.body, function(err, doc) {
res.json(doc);
});
});
app.delete('/AngularApp', function(req, res){
db.AngularApp.remove({},function(err, doc){
res.json(doc);
});
});
app.listen(3000);
console.log("Server running on point 30000");