1 00:00:07,500 --> 00:00:08,970 Welcome back. 2 00:00:09,000 --> 00:00:12,330 Let's get started with Mongoose. 3 00:00:12,690 --> 00:00:19,830 So to get started with Mongoose first, unless we connect our application to Mongoose. 4 00:00:19,860 --> 00:00:27,570 So in this video, we are going to learn how we can connect our application or express application to 5 00:00:27,600 --> 00:00:28,420 Mongoose. 6 00:00:28,440 --> 00:00:30,120 So let's start it. 7 00:00:30,390 --> 00:00:38,250 The first step is we need to create a folder for this particular project by making use of m.K, d, 8 00:00:38,280 --> 00:00:43,800 i r and the name of the folder our Carmine RS Mongoose Guide. 9 00:00:44,790 --> 00:00:48,930 Hit Enter next is let me see the into the mongoose guide. 10 00:00:49,170 --> 00:00:57,420 Let me open within my Visual Studio code and I have it open here as that. 11 00:00:57,660 --> 00:01:02,030 The next step is how can we install Mongoose? 12 00:01:02,040 --> 00:01:13,500 So if you go to Mongoose Gamescom, this is the official website for Mongoose and this is the official 13 00:01:13,530 --> 00:01:16,650 website for Mongoose. 14 00:01:17,160 --> 00:01:26,940 Lucky for us, Mongoose is being hoisted on NTP and meaning we can install Mongoose for NPM if we search 15 00:01:26,970 --> 00:01:29,160 for Mongoose and PM. 16 00:01:29,160 --> 00:01:32,130 You're going to see this particular page. 17 00:01:32,160 --> 00:01:34,170 Let's read this description. 18 00:01:34,170 --> 00:01:43,200 It says that Mongoose is a MongoDB object modeling to design to work in asynchronous environment. 19 00:01:43,200 --> 00:01:50,790 And lucky for us, Mongoose support both promises and callbacks, meaning that we can make use of async, 20 00:01:50,790 --> 00:01:53,790 await promises or callbacks. 21 00:01:53,790 --> 00:01:55,440 So let's see how. 22 00:01:55,530 --> 00:02:04,680 And down here you can see how popular this package is, about more than 1 million downloads per week. 23 00:02:04,680 --> 00:02:07,610 So let's go ahead and install Mongoose. 24 00:02:07,620 --> 00:02:14,070 Well, for us to be on the same pipeline, make sure you install the exact version of Mongoose. 25 00:02:14,070 --> 00:02:16,800 That is 6.5.2. 26 00:02:16,800 --> 00:02:20,070 So let's go ahead and then install it. 27 00:02:20,070 --> 00:02:27,960 So we are going to work with Mongoose alone without using Xpress and after that we will combine express 28 00:02:27,960 --> 00:02:30,420 to interact with Mongoose also. 29 00:02:30,420 --> 00:02:37,890 So back to the terminal or better stuff, you can use the built in terminal to issue the command. 30 00:02:37,890 --> 00:02:50,310 So let me come here and go ahead and install Mongoose and p m Install Mongoose version 6.5.3. 31 00:02:50,310 --> 00:02:52,770 Let me confirm again the exact version. 32 00:02:52,770 --> 00:02:53,610 Exactly. 33 00:02:53,730 --> 00:02:57,750 So let me go ahead and then install Mongoose. 34 00:02:59,480 --> 00:03:03,110 Now Mongoose has finished installing. 35 00:03:03,140 --> 00:03:06,410 So how can we run the application? 36 00:03:06,470 --> 00:03:12,470 Let's go ahead and create one file core server or mongoose. 37 00:03:12,500 --> 00:03:16,070 Let's make it as Mongoose dart js. 38 00:03:16,770 --> 00:03:20,340 Ain't your going to write everything on one file? 39 00:03:20,430 --> 00:03:27,240 If you go to the official website and on the home page, you will see how we can connect to Mongoose 40 00:03:27,240 --> 00:03:31,710 with two lines of code as compared to MongoDB. 41 00:03:31,740 --> 00:03:38,820 We wrote at least many lines to get it done, so let's see how we are going to do this one inside our 42 00:03:38,820 --> 00:03:39,720 application. 43 00:03:40,080 --> 00:03:50,660 So first step is we need to require the package core mongoose equal to require the mongoose package. 44 00:03:50,670 --> 00:03:53,010 And here we go. 45 00:03:53,400 --> 00:03:57,450 The next step is let's go ahead and connect to Mongoose. 46 00:03:57,450 --> 00:03:58,410 So here we go. 47 00:03:58,410 --> 00:03:59,310 Connect. 48 00:04:00,460 --> 00:04:03,550 To Mongoose. 49 00:04:03,700 --> 00:04:04,690 All right. 50 00:04:05,620 --> 00:04:08,180 I forgot to bring one over here. 51 00:04:08,200 --> 00:04:09,340 So here we go. 52 00:04:09,580 --> 00:04:13,210 On Mongoose, we have a method called Connect. 53 00:04:13,450 --> 00:04:15,460 And that is it, guys. 54 00:04:15,460 --> 00:04:16,660 And that is it. 55 00:04:16,690 --> 00:04:20,290 So here we pass in our connection string. 56 00:04:20,320 --> 00:04:23,770 Make sure you have your connections trained. 57 00:04:23,860 --> 00:04:29,710 So I'll copy my connection string here and let me come back to the project. 58 00:04:29,710 --> 00:04:31,750 And here I'll provide it. 59 00:04:31,750 --> 00:04:32,760 I'll start. 60 00:04:32,860 --> 00:04:38,560 And remember, it says that Mongoose David was asynchronous environment. 61 00:04:38,560 --> 00:04:43,500 So here it means that we need to handle both success and failure. 62 00:04:43,510 --> 00:04:50,360 It means when everything goes on where we want to tell the user that the connection was successful. 63 00:04:50,380 --> 00:04:52,990 For this one, I'm using promise. 64 00:04:52,990 --> 00:04:57,520 So here I'm going to console.log and it says that DB. 65 00:04:58,270 --> 00:04:59,320 Connect it. 66 00:05:00,380 --> 00:05:01,010 As that. 67 00:05:01,010 --> 00:05:02,570 So let me remove this. 68 00:05:03,290 --> 00:05:04,050 Column here. 69 00:05:04,070 --> 00:05:07,490 And if something goes wrong, I'll bring my catch. 70 00:05:07,490 --> 00:05:12,380 And in here I have the error and I can go ahead and console.log. 71 00:05:12,380 --> 00:05:13,250 The. 72 00:05:14,250 --> 00:05:20,850 Error dot message and we have a message on that and that is it. 73 00:05:20,880 --> 00:05:26,530 You see, I'm done with a connection as compared to MongoDB. 74 00:05:26,610 --> 00:05:29,940 You can see how we're able to connect using this function. 75 00:05:29,940 --> 00:05:34,790 So now how can we text that our connection was successful? 76 00:05:34,800 --> 00:05:37,220 So back to my terminal here. 77 00:05:37,320 --> 00:05:40,860 Make use of node and the file was Mongoose. 78 00:05:40,860 --> 00:05:41,910 So hit enter. 79 00:05:41,940 --> 00:05:43,440 Now let's wait. 80 00:05:44,910 --> 00:05:50,830 And MongoDB has been connected or DB has connected. 81 00:05:50,850 --> 00:05:59,580 So if I try to change the password and let's see if we are going to get some error now let me run the 82 00:05:59,580 --> 00:06:06,180 file again and let's see if you see that I get something called undefined. 83 00:06:06,330 --> 00:06:12,750 So I think there is something wrong or I forgot to bring the E here message. 84 00:06:13,170 --> 00:06:15,990 All right, but on my side, let me run it. 85 00:06:16,200 --> 00:06:19,920 You can see that we got bad of many bad authentication. 86 00:06:19,920 --> 00:06:21,690 That is, authentication failed. 87 00:06:21,720 --> 00:06:25,050 Meaning that I provided wrong password. 88 00:06:25,080 --> 00:06:27,090 So that is it. 89 00:06:27,270 --> 00:06:32,880 So this is how we can connect to MongoDB using Mongoose in the easiest way. 90 00:06:33,150 --> 00:06:36,720 Now that we are done with connection in this video. 91 00:06:36,870 --> 00:06:42,230 Let's see how we can create record and save it into MongoDB.