$scope.addPost = function() {
  $http.post('/api/blogs', $scope.formData)
  .success(function(data) {
    $scope.formData = {};
    $location.path('blogs');
    console.log(data, 'Blog created.');
  })
  .error(function(data) {
    console.log('Error: ' + data);
  })
};

//Dependencies.
var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');
var cors = require('cors');
var mongoose = require('mongoose');
var mongojs = require('mongojs');
var http = require('http');
var path = require('path');
var fs = require('fs');
var dotenv = require('dotenv');

var port = 9001;
var mongoUri = 'mongodb://localhost:27017/blog-app';

var app = express();

app.use(express.static(__dirname + '/public'));
app.use(bodyParser.json());

//Blog Data & Data Storage.
-----------------------------

var Schema = mongoose.Schema;

var blogSchema = new Schema({
   title : {type: String, min: 8, max: 50, required: true},
   body : {type: String, required: true},
   author : {type: String, min: 3, max: 40, required: true},
   pubdate : {type: Date, default: Date.now}
});

var Blog = mongoose.model('Blog', blogSchema);

//Routes.
----------

// GET BLOGS!

app.get('/api/blogs', function(req, res) {
    Blog.find(function (err, blogs) {
        if (err)
            res.send(err);
        res.json(blogs);
    });
});

// POST BLOG!

app.post('/api/blogs', function(req, res) {
    Blog.create({
        title: req.body.title,
        body: req.body.body,
        author: req.body.author,
        date: req.body.date
    }, function(err, blog) {
        if (err)
            res.send(err);
        Blog.find(function(err, blogs) {
            if (err)
                res.send(err);
            res.json(blogs);
        });
    });
});

var app = angular.module("blog-app");

app.controller('MainController', ['mainService', '$scope', '$http',  '$location', '$stateParams', '$state', function(mainService, $scope, $http, $location, $stateParams, $state) {

  $scope.formData = {};

  $scope.blog = [];

  function getBlogs() {
      mainService.getPosts().then(function(data) {
        $scope.blog = data;
        console.log(data, "The blogs.");
      });
  }

  getBlogs();

  $scope.readPost = function(id) {
      mainService.readPost(id).then(function(data) {
        $scope.readblog = data;
        console.log(data, "This is the blog you selected.")
      });
  };

  $scope.addPost = function(formData) {
      mainService.addPost(formData).then(function() {
        $scope.formData = {};
        $location.path('blogs');
        console.log(data, 'Blog created.');
      });
  };

}]); //End Controller.

var app = angular.module("blog-app");

app.service('mainService', function($http, $q) {

    var blog = [];
    var readblog = {};
    var formData = {};

    this.getPosts = function() {
        return $http.get('/api/blogs').then(function(response){
            blog = response.data;
            return blog;
        });
    }

    this.readPost = function(id) {
        return $http.get('/api/blogs/' + id).then(function(response) {
            readblog = response.data;
            return readblog;
      });
    };

    this.addPost = function(formData) {
        $http.post('/api/blogs', formData);
    };

  });

<div class="newblog">
    <a ui-sref="blogs"><i class="fa fa-close fa-2x exit"></i></a>
    <div class="form">
          <form>
                <i class="fa fa-pencil-square-o fa-5x"></i><br>

                <input class="blogtitle" type="text" ng- model="formData.title" placeholder="Blog Title" required /><br>

                <textarea ng-model="formData.body" rows="15" placeholder="Write the body of your blog here." required></textarea><br>

                <label for="">by:</label><br>
                <input class="blogauthor" type="text" ng-model="formData.author" placeholder="Author Name" required /><br><br>

                <button type="submit" ng- click="addPost()">Submit</button>
          </form>
    </div>
</div>

this.addPost = function(formData) {
    $http.post('/api/blogs', formData).then(function(response) {
        blog.push(response.data);
        return blog;
    })
};

$scope.addPost = function(data) {
  mainService.addPost(data).then(function(data) {
    $scope.blog.push(data);
    console.log(data, 'Blog created.');
  });
};