1 00:00:01,300 --> 00:00:02,640 ‫Welcome back. 2 00:00:02,640 --> 00:00:05,120 ‫Let's now finally set up Express, 3 00:00:05,120 --> 00:00:08,390 ‫create a simple server, and do some basic routing 4 00:00:08,390 --> 00:00:10,300 ‫just to get an initial feeling 5 00:00:10,300 --> 00:00:13,590 ‫of how we actually work in Express. 6 00:00:13,590 --> 00:00:16,230 ‫And so in this video, we're actually gonna start working 7 00:00:16,230 --> 00:00:19,883 ‫on the natours project, so the big main project 8 00:00:19,883 --> 00:00:21,690 ‫that is part of this course. 9 00:00:21,690 --> 00:00:23,750 ‫So just like before, please go ahead 10 00:00:23,750 --> 00:00:27,180 ‫and get the starter project from the course files. 11 00:00:27,180 --> 00:00:29,190 ‫I already have it here. 12 00:00:29,190 --> 00:00:32,470 ‫I have it opened up in my VS code. 13 00:00:32,470 --> 00:00:36,180 ‫Let's take just a very quick look at what we have here. 14 00:00:36,180 --> 00:00:38,270 ‫We have the prettier configuration file 15 00:00:38,270 --> 00:00:40,800 ‫just like we set up like before. 16 00:00:40,800 --> 00:00:44,210 ‫I also have a config file for ESLint, 17 00:00:44,210 --> 00:00:46,894 ‫and ESLint we haven't set up at this point, 18 00:00:46,894 --> 00:00:48,250 ‫but we're going to do that 19 00:00:48,250 --> 00:00:50,230 ‫also later in this section. 20 00:00:50,230 --> 00:00:51,810 ‫For now, I just want to start coding 21 00:00:51,810 --> 00:00:54,710 ‫and not worry about linting our code. 22 00:00:54,710 --> 00:00:57,410 ‫Linting is just to fix some errors. 23 00:00:57,410 --> 00:00:58,930 ‫But again, we're going to do that later. 24 00:00:58,930 --> 00:01:02,170 ‫Here we just have some files for later, 25 00:01:02,170 --> 00:01:07,170 ‫like css, images, okay, and now also for example, 26 00:01:07,700 --> 00:01:11,287 ‫some data that we need to build our application. 27 00:01:11,287 --> 00:01:14,790 ‫Again, we're going to start using this data here 28 00:01:14,790 --> 00:01:16,330 ‫throughout this section. 29 00:01:16,330 --> 00:01:19,440 ‫Anyway, we now have a brand new project. 30 00:01:19,440 --> 00:01:21,950 ‫The first thing that we usually do with a new project 31 00:01:21,950 --> 00:01:24,410 ‫is to create the package.json file, 32 00:01:24,410 --> 00:01:26,590 ‫just like I mentioned before. 33 00:01:26,590 --> 00:01:28,453 ‫We did that in the nodefarm project, 34 00:01:28,453 --> 00:01:31,090 ‫and now we're going to do that here as well. 35 00:01:31,090 --> 00:01:32,863 ‫I open up the integrated terminal. 36 00:01:34,480 --> 00:01:38,290 ‫You can do that by hitting this shortcut here 37 00:01:38,290 --> 00:01:40,490 ‫or just come here to View and then Terminal. 38 00:01:41,710 --> 00:01:44,750 ‫Let me put it up a little bit so you can see it. 39 00:01:44,750 --> 00:01:47,510 ‫Remember the command is npm init. 40 00:01:48,927 --> 00:01:51,083 ‫We gave a name to the project. 41 00:01:53,010 --> 00:01:54,340 ‫It's called natours. 42 00:01:54,340 --> 00:01:56,540 ‫Oh okay, it cannot have any capital letters. 43 00:01:57,560 --> 00:01:59,000 ‫Let's do that again. 44 00:01:59,000 --> 00:02:02,190 ‫The version is one, description, let's just say 45 00:02:02,190 --> 00:02:07,190 ‫learning node, express, and mongoDB, mongoDB. 46 00:02:11,930 --> 00:02:13,930 ‫Entry point, index.js, well actually, 47 00:02:13,930 --> 00:02:16,400 ‫we're going to use app.js now. 48 00:02:16,400 --> 00:02:17,890 ‫Let's call it app.js. 49 00:02:17,890 --> 00:02:20,820 ‫We have no test command, no git, no keywords, 50 00:02:20,820 --> 00:02:24,633 ‫author is me, and that's it, so okay. 51 00:02:28,090 --> 00:02:29,533 ‫Here we have package.json. 52 00:02:30,560 --> 00:02:32,393 ‫Just like before, nothing new here. 53 00:02:33,363 --> 00:02:35,720 ‫Now it's time to install Express. 54 00:02:35,720 --> 00:02:38,820 ‫Npm I express. 55 00:02:38,820 --> 00:02:40,630 ‫I'm going to use Express for here, 56 00:02:40,630 --> 00:02:42,100 ‫which is at the point of recording, 57 00:02:42,100 --> 00:02:44,610 ‫the latest version, but for some time, 58 00:02:44,610 --> 00:02:47,860 ‫the Express team has been working on version 5. 59 00:02:47,860 --> 00:02:50,170 ‫That is a major version which could introduce 60 00:02:50,170 --> 00:02:53,240 ‫breaking changes if you installed that one. 61 00:02:53,240 --> 00:02:54,750 ‫Now, there's actually not a lot of stuff 62 00:02:54,750 --> 00:02:57,450 ‫changing in version 5, but to make sure, 63 00:02:57,450 --> 00:03:01,170 ‫please install Express at version 4 just like I'm doing. 64 00:03:01,170 --> 00:03:05,310 ‫In order to do that, just hit at 4. 65 00:03:05,310 --> 00:03:08,770 ‫That will then install the latest version inside of 4 66 00:03:08,770 --> 00:03:13,140 ‫with the latest minor and patch versions, so 4.16.4. 67 00:03:14,260 --> 00:03:16,300 ‫That's the version that I'm using now 68 00:03:16,300 --> 00:03:18,630 ‫in this course, and yours will probably be 69 00:03:18,630 --> 00:03:21,480 ‫a later version, but as long as you have the 4 here 70 00:03:21,480 --> 00:03:23,330 ‫in the beginning, you should be fine. 71 00:03:24,563 --> 00:03:26,060 ‫You see that it actually created 72 00:03:26,060 --> 00:03:28,307 ‫our node modules folder over here. 73 00:03:28,307 --> 00:03:30,505 ‫Now, we're ready to start. 74 00:03:30,505 --> 00:03:35,030 ‫I'm creating a new file and it's called app.js. 75 00:03:35,030 --> 00:03:37,470 ‫It's kind of a convention to have 76 00:03:37,470 --> 00:03:39,763 ‫all the Express configuration in app.js. 77 00:03:40,949 --> 00:03:42,743 ‫That's what I'm using here now. 78 00:03:43,860 --> 00:03:45,410 ‫We have now the warning 79 00:03:45,410 --> 00:03:46,900 ‫that it can't load ESLint. 80 00:03:46,900 --> 00:03:48,650 ‫Again, we're going to configure that later 81 00:03:48,650 --> 00:03:50,260 ‫throughout this section. 82 00:03:50,260 --> 00:03:51,903 ‫So, let's now use Express. 83 00:03:53,661 --> 00:03:58,661 ‫I'm going to require of course, the Express package. 84 00:03:58,670 --> 00:04:00,370 ‫Nothing new at this point. 85 00:04:00,370 --> 00:04:01,490 ‫Give it a safe. 86 00:04:01,490 --> 00:04:03,850 ‫You see that preview already did its magic here 87 00:04:03,850 --> 00:04:06,170 ‫by adding this semi-colon and also adding 88 00:04:06,170 --> 00:04:07,403 ‫this new line down here. 89 00:04:08,500 --> 00:04:10,840 ‫We have Express imported, and now what we do 90 00:04:10,840 --> 00:04:13,100 ‫is to create a variable called app. 91 00:04:13,100 --> 00:04:14,793 ‫Again, that's kind of a standard. 92 00:04:16,540 --> 00:04:20,683 ‫So app and assigned result of calling express. 93 00:04:21,577 --> 00:04:23,063 ‫That's actually it. 94 00:04:24,290 --> 00:04:26,960 ‫This here is a function which upon calling 95 00:04:26,960 --> 00:04:30,373 ‫will add a bunch of methods to our app variable here. 96 00:04:31,700 --> 00:04:32,870 ‫The first one that we're going to use 97 00:04:32,870 --> 00:04:34,930 ‫is actually app.listen to 98 00:04:34,930 --> 00:04:36,543 ‫basically start up a server. 99 00:04:38,769 --> 00:04:40,990 ‫That is a bit similar to what we did before 100 00:04:40,990 --> 00:04:44,730 ‫with the http package in the previous sections, right. 101 00:04:44,730 --> 00:04:46,500 ‫So again, keep in mind that Express 102 00:04:46,500 --> 00:04:49,430 ‫is 100% no js under the hood, 103 00:04:49,430 --> 00:04:50,710 ‫and some of the things work 104 00:04:50,710 --> 00:04:53,070 ‫in a very similar way here in Express. 105 00:04:53,070 --> 00:04:54,980 ‫All right, again, it simply makes our lives 106 00:04:54,980 --> 00:04:56,790 ‫a bit easier by taking some of 107 00:04:56,790 --> 00:04:58,920 ‫the complexity away from us. 108 00:04:58,920 --> 00:05:00,670 ‫Just like before, into app.listen, 109 00:05:00,670 --> 00:05:01,770 ‫we paste in the port. 110 00:05:01,770 --> 00:05:05,053 ‫Let's actually create a variable for that here before. 111 00:05:07,170 --> 00:05:09,870 ‫Port and let's say 3000 for now. 112 00:05:09,870 --> 00:05:11,820 ‫We're going to change that a bit later. 113 00:05:13,930 --> 00:05:16,443 ‫We paste in the port and a callback function. 114 00:05:17,730 --> 00:05:19,108 ‫Again, this is the callback function 115 00:05:19,108 --> 00:05:21,280 ‫that will be called as soon as 116 00:05:21,280 --> 00:05:22,743 ‫the server starts listening. 117 00:05:24,490 --> 00:05:27,340 ‫Let's simply do a console.log here, 118 00:05:27,340 --> 00:05:29,963 ‫app running on port. 119 00:05:36,770 --> 00:05:38,690 ‫All right, so that is our server 120 00:05:38,690 --> 00:05:40,550 ‫now actually already listening. 121 00:05:40,550 --> 00:05:43,660 ‫Now what we need to do next is to define route. 122 00:05:43,660 --> 00:05:45,320 ‫And once more, we actually already 123 00:05:45,320 --> 00:05:47,200 ‫kind of defined routes before 124 00:05:47,200 --> 00:05:49,840 ‫in the nodefarm project, remember that, 125 00:05:49,840 --> 00:05:52,770 ‫but it works very differently with Express. 126 00:05:52,770 --> 00:05:54,780 ‫Remember that routing means basically 127 00:05:54,780 --> 00:05:57,560 ‫to determine how an application responds 128 00:05:57,560 --> 00:06:01,053 ‫to a certain client request, so to a certain URL. 129 00:06:02,250 --> 00:06:04,030 ‫And actually, it's not just a URL 130 00:06:04,030 --> 00:06:05,732 ‫but also the http method 131 00:06:05,732 --> 00:06:08,280 ‫which is used for that request. 132 00:06:08,280 --> 00:06:11,283 ‫Remember that from the http lecture that we had before. 133 00:06:12,370 --> 00:06:14,060 ‫How do we do that? 134 00:06:14,060 --> 00:06:16,570 ‫Well, it's very simple in Express. 135 00:06:16,570 --> 00:06:19,377 ‫All we do is app, then the http method 136 00:06:19,377 --> 00:06:21,960 ‫that we want to respond to, 137 00:06:21,960 --> 00:06:23,300 ‫and let's start with the simplest one 138 00:06:23,300 --> 00:06:25,643 ‫which is get, and then the URL. 139 00:06:26,630 --> 00:06:30,053 ‫We're just specifying the kind of root URL here. 140 00:06:31,880 --> 00:06:34,380 ‫Again, the route is basically the URL, 141 00:06:34,380 --> 00:06:36,980 ‫which in this case, is just this root URL 142 00:06:36,980 --> 00:06:40,513 ‫and also the http method, which is get in this case. 143 00:06:42,210 --> 00:06:44,100 ‫Now, what do we actually want to happen 144 00:06:44,100 --> 00:06:47,570 ‫when someone hits that URL with a get request? 145 00:06:47,570 --> 00:06:49,280 ‫Well, whatever we want to do, 146 00:06:49,280 --> 00:06:51,710 ‫we need to specify it in a callback function, 147 00:06:51,710 --> 00:06:54,758 ‫which we specify as the second argument. 148 00:06:54,758 --> 00:06:56,108 ‫We have a callback function 149 00:06:58,280 --> 00:07:00,720 ‫just like this, and this callback function 150 00:07:00,720 --> 00:07:03,575 ‫can accept a couple of arguments. 151 00:07:03,575 --> 00:07:05,870 ‫The most basic one, and the ones that we usually 152 00:07:05,870 --> 00:07:10,590 ‫always need are get request, entity response. 153 00:07:10,590 --> 00:07:13,740 ‫In that regard, it is again very similar 154 00:07:13,740 --> 00:07:16,503 ‫to what we did before in the nodefarm project. 155 00:07:17,380 --> 00:07:19,280 ‫Back then, when we started our server, 156 00:07:19,280 --> 00:07:21,380 ‫we also had access to the request 157 00:07:21,380 --> 00:07:23,210 ‫and to response object. 158 00:07:23,210 --> 00:07:26,020 ‫Now, they are a little bit different here in Express. 159 00:07:26,020 --> 00:07:29,364 ‫They have a lot more data and methods on them, 160 00:07:29,364 --> 00:07:32,560 ‫but the idea is exactly the same. 161 00:07:32,560 --> 00:07:34,740 ‫So you see that Express apps 162 00:07:34,740 --> 00:07:37,150 ‫and so also node apps for that matter, 163 00:07:37,150 --> 00:07:39,890 ‫are all about requests and responses, 164 00:07:39,890 --> 00:07:42,660 ‫simply because that is how the web actually works 165 00:07:42,660 --> 00:07:45,053 ‫just as you learned in the previous sections. 166 00:07:47,280 --> 00:07:48,360 ‫What do we want to do now? 167 00:07:48,360 --> 00:07:50,150 ‫Well, all we want to do is to send 168 00:07:50,150 --> 00:07:51,613 ‫some data back very quickly. 169 00:07:52,620 --> 00:07:55,122 ‫We can use the response object 170 00:07:55,122 --> 00:07:58,560 ‫and from there, we can use the send method 171 00:07:58,560 --> 00:08:01,113 ‫and specify something that we want to send back. 172 00:08:03,180 --> 00:08:04,823 ‫Hello from the server side. 173 00:08:06,476 --> 00:08:09,700 ‫Just some string again that we want to send back. 174 00:08:09,700 --> 00:08:11,490 ‫We can also specify the status code 175 00:08:11,490 --> 00:08:12,580 ‫and that's very easy. 176 00:08:12,580 --> 00:08:15,380 ‫All we have to do is to before we actually send 177 00:08:15,380 --> 00:08:16,850 ‫the string to the client, 178 00:08:16,850 --> 00:08:18,693 ‫we just add status before that. 179 00:08:20,200 --> 00:08:23,680 ‫The status method, and in here, 180 00:08:23,680 --> 00:08:25,420 ‫we specify our code. 181 00:08:25,420 --> 00:08:27,943 ‫And again, we're going to use 200 for okay. 182 00:08:29,990 --> 00:08:32,570 ‫That's actually all we have to do. 183 00:08:32,570 --> 00:08:34,360 ‫Let's very quickly test this out 184 00:08:34,360 --> 00:08:36,223 ‫and then add some more stuff to it. 185 00:08:38,610 --> 00:08:43,610 ‫Let's use nodemon app.js. 186 00:08:43,640 --> 00:08:44,850 ‫Let's see what happens 187 00:08:44,850 --> 00:08:47,420 ‫and our app is running on port 3000. 188 00:08:47,420 --> 00:08:48,390 ‫Great. 189 00:08:48,390 --> 00:08:50,690 ‫And how do we now test this API? 190 00:08:50,690 --> 00:08:52,893 ‫Well, that's why we installed Postman. 191 00:08:54,280 --> 00:08:55,623 ‫Let's open up Postman. 192 00:08:56,560 --> 00:08:59,233 ‫Actually it's still here from the last lecture. 193 00:09:00,450 --> 00:09:02,920 ‫Let's go ahead and delete this 194 00:09:02,920 --> 00:09:06,730 ‫and write the URL, or actually, the IP 195 00:09:06,730 --> 00:09:10,710 ‫for local host and then our port. 196 00:09:10,710 --> 00:09:12,710 ‫That is exactly the same as we did 197 00:09:12,710 --> 00:09:14,333 ‫in the nodefarm project. 198 00:09:15,680 --> 00:09:17,103 ‫We're hitting just the root. 199 00:09:18,060 --> 00:09:19,890 ‫We can write the slash or it works 200 00:09:19,890 --> 00:09:21,440 ‫just the same without anything. 201 00:09:22,300 --> 00:09:24,650 ‫Let's send this and indeed, here we go. 202 00:09:24,650 --> 00:09:27,070 ‫Hello from the server side. 203 00:09:27,070 --> 00:09:30,030 ‫That's amazing, it already works. 204 00:09:30,030 --> 00:09:31,500 ‫Just to make sure, we would of course 205 00:09:31,500 --> 00:09:34,128 ‫get the exact same result in a browser. 206 00:09:34,128 --> 00:09:38,501 ‫If I copy this here, you will see the same result. 207 00:09:38,501 --> 00:09:40,560 ‫But again, we're going to use Postman 208 00:09:40,560 --> 00:09:45,130 ‫because it makes all this API testing a lot easier for us. 209 00:09:45,130 --> 00:09:47,330 ‫You will see, once we really start using 210 00:09:47,330 --> 00:09:49,783 ‫more and more features of this great application. 211 00:09:51,330 --> 00:09:53,800 ‫Now, going back here, let's add some more stuff 212 00:09:53,800 --> 00:09:56,270 ‫because send simply sends this string here 213 00:09:56,270 --> 00:09:58,860 ‫back to the client, but it's also very easy 214 00:09:58,860 --> 00:10:01,280 ‫to send json to the client. 215 00:10:01,280 --> 00:10:04,853 ‫Instead of using send, let's actually use json. 216 00:10:06,523 --> 00:10:08,370 ‫The json method, and then in here, 217 00:10:08,370 --> 00:10:10,203 ‫we can paste in an object. 218 00:10:11,440 --> 00:10:12,540 ‫Let's do it like this. 219 00:10:18,480 --> 00:10:19,980 ‫Let's say this is the message. 220 00:10:22,550 --> 00:10:25,133 ‫And then just some other field here, natours. 221 00:10:29,060 --> 00:10:31,050 ‫Okay, and now you see, that preview here 222 00:10:31,050 --> 00:10:33,230 ‫auto-formatted this for us 223 00:10:33,230 --> 00:10:35,230 ‫and they also want this in another line. 224 00:10:36,260 --> 00:10:38,560 ‫Ah okay, we're missing a comma here of course. 225 00:10:39,410 --> 00:10:41,380 ‫But the preview extension still put it 226 00:10:41,380 --> 00:10:43,250 ‫up here for some reason. 227 00:10:43,250 --> 00:10:44,350 ‫But of course, that doesn't really matter. 228 00:10:44,350 --> 00:10:46,023 ‫It's just a matter of formatting. 229 00:10:47,955 --> 00:10:50,413 ‫Let's take a look at what happens now. 230 00:10:52,840 --> 00:10:55,960 ‫Now we have our nicely formatted json here. 231 00:10:55,960 --> 00:10:57,477 ‫Gives us all these different colors here 232 00:10:57,477 --> 00:10:59,077 ‫for the keys and for the values. 233 00:10:59,930 --> 00:11:02,010 ‫Here we have the status codes. 234 00:11:02,010 --> 00:11:04,890 ‫Here we have the time it took to do this request. 235 00:11:04,890 --> 00:11:07,683 ‫We also have the size of the response. 236 00:11:08,620 --> 00:11:11,190 ‫We could, for example, change the code here very easily. 237 00:11:11,190 --> 00:11:13,973 ‫404 is not found, remember. 238 00:11:14,830 --> 00:11:19,120 ‫Do it again, and then here you see, 404, not found. 239 00:11:19,120 --> 00:11:20,110 ‫That's the kind of stuff that 240 00:11:20,110 --> 00:11:22,020 ‫Postman is really great for. 241 00:11:22,020 --> 00:11:24,893 ‫Let's actually increase the size of all this. 242 00:11:27,930 --> 00:11:31,730 ‫Let's now continue, just add something else here. 243 00:11:31,730 --> 00:11:32,760 ‫Just something very easy. 244 00:11:32,760 --> 00:11:34,870 ‫Remember, all of this is just to test it out, 245 00:11:34,870 --> 00:11:37,070 ‫to get our feet wet, and start getting 246 00:11:37,070 --> 00:11:39,060 ‫a little bit of experience. 247 00:11:39,060 --> 00:11:43,233 ‫Remember that this here is the http method for the request. 248 00:11:44,328 --> 00:11:46,900 ‫This response that we're sending here, 249 00:11:46,900 --> 00:11:49,040 ‫so this one here, is only sent 250 00:11:49,040 --> 00:11:54,040 ‫when this get method is sent to our server on this URL. 251 00:11:57,180 --> 00:11:58,520 ‫Let me actually show it to you. 252 00:11:58,520 --> 00:12:00,753 ‫If we do, for example, a post. 253 00:12:02,220 --> 00:12:04,420 ‫That's very easy again with Postman. 254 00:12:04,420 --> 00:12:07,200 ‫If we do a post, then we will not get anything. 255 00:12:07,200 --> 00:12:10,490 ‫Instead, what Express automatically sends back is 256 00:12:10,490 --> 00:12:14,270 ‫this html here which says cannot post 257 00:12:14,270 --> 00:12:16,260 ‫and then with a 404, not found. 258 00:12:16,260 --> 00:12:18,480 ‫That's because we don't have any route defined 259 00:12:18,480 --> 00:12:22,163 ‫for this URL and for this http method. 260 00:12:23,450 --> 00:12:25,493 ‫Let's now very quickly do that. 261 00:12:28,370 --> 00:12:31,423 ‫So post, we want the same URL, 262 00:12:34,920 --> 00:12:36,743 ‫the request and the response object. 263 00:12:38,810 --> 00:12:41,823 ‫Let's simply say res.send, 264 00:12:46,090 --> 00:12:48,723 ‫you can post to this endpoint. 265 00:12:52,400 --> 00:12:54,200 ‫Just so you see that this is how 266 00:12:54,200 --> 00:12:56,240 ‫we send different responses for 267 00:12:56,240 --> 00:12:59,023 ‫different http methods in the request. 268 00:13:00,800 --> 00:13:03,380 ‫Let's run that again, and indeed, 269 00:13:03,380 --> 00:13:07,033 ‫you can post to this endpoint with a 200 status code. 270 00:13:07,033 --> 00:13:09,110 ‫This is actually the default one 271 00:13:09,110 --> 00:13:12,395 ‫when we do not specify any in our codes. 272 00:13:12,395 --> 00:13:15,610 ‫Here we have 404 which is not correct. 273 00:13:15,610 --> 00:13:18,610 ‫But again, 200 is actually the default. 274 00:13:18,610 --> 00:13:20,360 ‫Another quick thing that I want to show you 275 00:13:20,360 --> 00:13:23,400 ‫is that by using this json method here for example, 276 00:13:23,400 --> 00:13:26,000 ‫this will automatically set our content type 277 00:13:26,000 --> 00:13:28,680 ‫to application json, so remember that 278 00:13:28,680 --> 00:13:31,580 ‫we did that manually in the nodefarm app 279 00:13:31,580 --> 00:13:34,800 ‫when we created our very simple API. 280 00:13:34,800 --> 00:13:37,360 ‫Back then, we also sent back some json, 281 00:13:37,360 --> 00:13:39,650 ‫but we then had to manually define that 282 00:13:39,650 --> 00:13:42,360 ‫the content was json so that the browser knew 283 00:13:42,360 --> 00:13:43,523 ‫what it was expecting. 284 00:13:44,550 --> 00:13:47,440 ‫But Express takes that work away from us. 285 00:13:47,440 --> 00:13:48,763 ‫Let's actually check that. 286 00:13:50,020 --> 00:13:51,563 ‫Going back to get. 287 00:13:53,120 --> 00:13:55,760 ‫Here we have our result headers. 288 00:13:55,760 --> 00:13:57,250 ‫Here you see that the content type 289 00:13:57,250 --> 00:14:00,040 ‫is indeed set to application json. 290 00:14:00,040 --> 00:14:02,100 ‫Express then also automatically sends 291 00:14:02,100 --> 00:14:04,020 ‫a bunch of other headers, for example, 292 00:14:04,020 --> 00:14:08,623 ‫this powered by Express or the date or the connection. 293 00:14:09,930 --> 00:14:11,880 ‫But again, we're going to take more care 294 00:14:11,880 --> 00:14:15,040 ‫of headers a bit later in the course. 295 00:14:15,040 --> 00:14:18,410 ‫This was just a very small and simple example here, 296 00:14:18,410 --> 00:14:20,320 ‫but you can already start to appreciate 297 00:14:20,320 --> 00:14:24,240 ‫how much easier it is to do this kind of responses. 298 00:14:24,240 --> 00:14:27,660 ‫To create this route in order to respond to client request, 299 00:14:27,660 --> 00:14:31,373 ‫in a much easier way than in just plain node.js. 300 00:14:32,650 --> 00:14:34,390 ‫With that being said, in the next video, 301 00:14:34,390 --> 00:14:36,990 ‫we're going to learn all about building APIs 302 00:14:36,990 --> 00:14:39,930 ‫using the rest architecture, so that after that, 303 00:14:39,930 --> 00:14:42,150 ‫we can finally start building our API.