1 00:00:00,300 --> 00:00:00,790 Beautiful. 2 00:00:00,960 --> 00:00:09,090 We are familiar with the middle where we have our first Mendler function, but there are two issues 3 00:00:09,090 --> 00:00:10,080 with this current setup. 4 00:00:10,500 --> 00:00:17,850 First, our objets is getting somewhat clunky because, I mean, we have this longer than we have the 5 00:00:17,850 --> 00:00:18,320 methods. 6 00:00:19,020 --> 00:00:24,570 It's definitely nicer if we have this a longer function in a separate file. 7 00:00:25,320 --> 00:00:32,640 It's just going to keep our objets lean and in turn it's just going to make it easier for us to navigate 8 00:00:32,640 --> 00:00:35,300 and essentially work with our application. 9 00:00:35,910 --> 00:00:37,210 And the second issue. 10 00:00:37,380 --> 00:00:44,360 What if I have 50 more out and I don't want to add this function manually to all of them? 11 00:00:44,760 --> 00:00:50,910 Would wouldn't be nicer if there would be a method that essentially just adds my middleware function 12 00:00:51,150 --> 00:00:52,320 to Enero. 13 00:00:52,680 --> 00:00:56,060 And of course, the answer is yes, there is such a function. 14 00:00:56,080 --> 00:00:58,710 In fact, we used it a few years ago. 15 00:00:59,050 --> 00:01:03,420 Now, let's start, though, by moving this sucker into a separate file. 16 00:01:04,530 --> 00:01:13,080 So I'm going to go to my not bar, I'm sorry, this is what happens when you have a bunch of projects 17 00:01:13,080 --> 00:01:15,390 open, meaning a bunch of folders open. 18 00:01:15,660 --> 00:01:22,010 Let me go here where I have my abcess and I'm just going to create a new file. 19 00:01:22,470 --> 00:01:24,600 And this is still going to be created in the final. 20 00:01:24,600 --> 00:01:24,930 Sorry. 21 00:01:25,270 --> 00:01:31,770 So let me go here and I'll create a new file and I'll call this a logger just now. 22 00:01:31,770 --> 00:01:35,460 If you really want, you can add the middle order in name as well. 23 00:01:35,460 --> 00:01:41,450 But in my case I'm just going to add the name of my function, then I'll cut it out. 24 00:01:42,300 --> 00:01:45,150 And what's really cool that we know how to export this, right? 25 00:01:45,510 --> 00:01:52,980 So we have const logger and then we go with module exports and we'll just set it equal to our water. 26 00:01:53,340 --> 00:01:56,160 So now we have default export that our logger. 27 00:01:56,430 --> 00:02:01,260 So of course in the address I simply need to go with const logger is equal. 28 00:02:02,140 --> 00:02:12,130 And then I require it, I go with lager, and if I navigate to localhost five thousand, I still should 29 00:02:12,130 --> 00:02:17,070 see in a console my log and if you do, then everything is correct. 30 00:02:17,920 --> 00:02:25,340 So that's the first part, not a second, how can I apply this loga to all my routes? 31 00:02:25,960 --> 00:02:36,340 So, for example, let me just copy and paste these ones and I'll say API and then product and learn 32 00:02:36,340 --> 00:02:43,690 API and I don't know, not about maybe items, then it doesn't really matter what you place here. 33 00:02:44,090 --> 00:02:48,040 I'm going to go with products as well as items. 34 00:02:48,490 --> 00:02:56,500 Again, I can add them manually, but the more route I'm going to have well, the bigger issue, this 35 00:02:56,500 --> 00:03:01,850 is going to become right, because for every route I need to manually add this login. 36 00:03:02,230 --> 00:03:06,340 So a better solution is this one where I select all of them. 37 00:03:06,350 --> 00:03:08,090 I just remove them like. 38 00:03:08,110 --> 00:03:14,200 So now, of course, if I go to any of these routes, I'm not going to have anything in the console. 39 00:03:14,200 --> 00:03:19,210 But there is a method by the name of App Dot Use. 40 00:03:19,540 --> 00:03:22,990 And in that app that use, this is what we do. 41 00:03:22,990 --> 00:03:24,900 We pass in the middleware. 42 00:03:25,210 --> 00:03:27,340 So we simply go with a logger. 43 00:03:27,790 --> 00:03:40,120 And once I say check it out now if I go to about for example, or if I go to home or API and then products 44 00:03:40,120 --> 00:03:41,590 and hopefully get an idea. 45 00:03:42,530 --> 00:03:46,480 All the time you'll get of this log in council. 46 00:03:46,790 --> 00:03:47,190 Why? 47 00:03:47,240 --> 00:03:52,090 Well, because Abdah used will invoke this for any group. 48 00:03:52,340 --> 00:03:54,380 Now, please do keep in mind two things. 49 00:03:54,380 --> 00:04:03,810 First or matters here, if I'm going to place this below douget and if I'm going to try to do that in 50 00:04:03,810 --> 00:04:06,700 the home page, I'm not going to see anything in council. 51 00:04:06,710 --> 00:04:07,170 Why? 52 00:04:07,610 --> 00:04:13,600 Well, because I invoke my use only after get an express. 53 00:04:14,000 --> 00:04:16,029 Everything goes in order. 54 00:04:16,070 --> 00:04:23,150 So if I get is before the use one, the one that applies to all the out and yes. 55 00:04:23,570 --> 00:04:26,780 Well first will hit the homer and then we'll send back home. 56 00:04:26,910 --> 00:04:28,150 So there is no longer. 57 00:04:28,310 --> 00:04:35,360 So that's why you'll see all the middleware functions, all the app that uses at the top of the document. 58 00:04:35,780 --> 00:04:42,940 So you'll have your mail functions first and only then you have all your other methods, whether that's 59 00:04:42,950 --> 00:04:45,640 get post and you get an idea. 60 00:04:45,980 --> 00:04:48,620 So that's the first thing that I would like to mention now. 61 00:04:48,650 --> 00:04:54,170 The second thing that I would like to mention is the fact that we can add here a path. 62 00:04:54,350 --> 00:04:57,170 So if I go to abduct use, that's my method. 63 00:04:57,440 --> 00:05:04,130 And instead of providing only one argument, which in my case is the longer I can set up a first one 64 00:05:04,130 --> 00:05:07,960 and that is going to be path, and I just need to come up with a value. 65 00:05:08,180 --> 00:05:12,680 Now, in my case, I'm going to type API and you'll see in a second one. 66 00:05:12,980 --> 00:05:19,820 So if you save with an API, you'll notice something interesting where this is going to be apply to 67 00:05:19,820 --> 00:05:24,640 both of them, to the product as well as the items. 68 00:05:25,070 --> 00:05:25,910 So here's the deal. 69 00:05:26,120 --> 00:05:33,730 Once you apply this path over here, basically it's going to apply to any route after this API. 70 00:05:33,980 --> 00:05:41,210 So, for example, if I go with API and then some crazy one home about and then products all the time 71 00:05:41,210 --> 00:05:43,580 is going to keep on applying this more. 72 00:05:43,730 --> 00:05:44,690 So that's something new. 73 00:05:44,700 --> 00:05:52,370 Right, because previously we worked only with a specific Ruzzo forward slash or about or product here. 74 00:05:52,550 --> 00:05:59,300 In this case, of course, these are different now when we add this path to use and of course it's going 75 00:05:59,300 --> 00:06:05,330 to be applied pretty much to anything that comes after the path that you provide over here. 76 00:06:05,360 --> 00:06:12,110 So in my case, since I provided API and of course, this is going to go for any path that after that. 77 00:06:12,440 --> 00:06:18,060 Now, if you want to find out more info about Abda use, I suggest navigating to your docs. 78 00:06:18,080 --> 00:06:23,270 Again, we're looking for API reference in our case, that is for and if you take a look at the app 79 00:06:23,270 --> 00:06:30,170 that used Mount's specified middleware function or functions, and we're going to cover that later as 80 00:06:30,170 --> 00:06:32,390 well at the specified path. 81 00:06:32,960 --> 00:06:37,650 And the word function is executed when the base of the request path matches. 82 00:06:37,970 --> 00:06:40,730 So this is going to be our base. 83 00:06:41,150 --> 00:06:46,460 And then whatever comes after, we'll still invoke that middleware function. 84 00:06:46,820 --> 00:06:54,610 And if you augment the path, then this is going to be applied to all of your requests. 85 00:06:55,010 --> 00:07:03,170 So if I were to remove the path now, it's going to be applied to home about API product as well as 86 00:07:03,170 --> 00:07:04,520 API items.