1 00:00:04,510 --> 00:00:08,650 Let's get started with express routing. 2 00:00:09,010 --> 00:00:15,640 Well, before we get into this, let's look at the final project that we are going to build. 3 00:00:16,120 --> 00:00:26,560 We are going to build a simple API where we can perform all the operations like delete, create, update 4 00:00:26,560 --> 00:00:28,950 and fetch a single record. 5 00:00:28,960 --> 00:00:36,970 And we are not going to use any database yet, but instead we are going to use the FS module from Node.js 6 00:00:36,970 --> 00:00:39,640 to write the data onto a file. 7 00:00:39,820 --> 00:00:46,290 And I will also show you a tool called Postman for API Development. 8 00:00:46,300 --> 00:00:50,380 So let's get back to the project and see how it's going to work. 9 00:00:50,590 --> 00:00:58,930 The cool thing about this application is that as soon as I run the server, it is going to create a 10 00:00:58,930 --> 00:01:05,780 folder called Data where we have a file called post dot JSON file. 11 00:01:05,800 --> 00:01:11,740 So let's run the server and see if it's going to create those folders and files. 12 00:01:11,860 --> 00:01:13,630 So put your eyes here. 13 00:01:13,630 --> 00:01:19,390 As soon as the server get connected, you can see that it's going to generate a folder for me. 14 00:01:19,420 --> 00:01:21,010 Moment of truth. 15 00:01:21,010 --> 00:01:31,240 And indeed we have a folder called Data and inside it has generated a file called post dot json file. 16 00:01:31,270 --> 00:01:39,250 And on that it has written a content or a sample post onto the file how awesome it is. 17 00:01:39,250 --> 00:01:42,520 And you are going to create the function to get this done. 18 00:01:42,520 --> 00:01:45,880 And that function is inside the utils file. 19 00:01:46,030 --> 00:01:49,690 So now we have a data where we can work on. 20 00:01:49,690 --> 00:01:57,670 So on this file we can add a new post onto this file or we can fetch a single record on this file or 21 00:01:57,670 --> 00:02:00,730 we can delete a file and it will reflect. 22 00:02:00,730 --> 00:02:03,100 So let's see how it's going to work. 23 00:02:03,280 --> 00:02:05,470 Now back to my server file here. 24 00:02:05,470 --> 00:02:07,540 Let me use the file that I created. 25 00:02:07,750 --> 00:02:09,610 That is the JSON file. 26 00:02:09,970 --> 00:02:11,680 So back to Postman. 27 00:02:11,680 --> 00:02:17,880 What I'm going to do is that I'm going to fetch all the posts inside the JSON file. 28 00:02:17,890 --> 00:02:19,840 So now moment of truth. 29 00:02:19,960 --> 00:02:27,910 When I hit send it will see that the post that the server created and this is what I see here, check 30 00:02:27,910 --> 00:02:28,360 it out. 31 00:02:28,360 --> 00:02:31,000 And indeed this is what we have. 32 00:02:31,300 --> 00:02:35,600 So what about if we want to add a record or post onto the file? 33 00:02:35,620 --> 00:02:36,480 Now let's see. 34 00:02:36,490 --> 00:02:43,180 And you are going to use what is called create and you are going to use HTTP method called post. 35 00:02:43,300 --> 00:02:46,450 So now when I hit send, now have a look. 36 00:02:46,460 --> 00:02:50,410 It will see that I get very full message that post created. 37 00:02:50,440 --> 00:02:52,760 Now let's check it out on the file. 38 00:02:52,780 --> 00:02:56,740 Indeed, I have a new post onto the file. 39 00:02:56,770 --> 00:03:01,960 How awesome it is and I can go ahead and create new post this time around. 40 00:03:01,960 --> 00:03:06,190 Let me see how to learn CSS like that and then this. 41 00:03:06,190 --> 00:03:13,000 I'm going to be the you are going to be something like two and four description, let's say the best 42 00:03:13,000 --> 00:03:15,690 post ever to when I hit send. 43 00:03:15,700 --> 00:03:17,560 Now have a look on the file. 44 00:03:17,770 --> 00:03:18,640 Have a look. 45 00:03:18,670 --> 00:03:24,790 It could say that indeed we have it and has given me the ID automatically. 46 00:03:24,790 --> 00:03:25,570 You can see. 47 00:03:25,570 --> 00:03:33,580 And it's even added a new post on top of it because I use on shift meaning for on shift it adds a new 48 00:03:33,580 --> 00:03:35,440 content onto the array. 49 00:03:35,680 --> 00:03:40,660 So what about if you are trying to delete a post or a record? 50 00:03:40,750 --> 00:03:44,110 Right now you have three real code 1 to 3. 51 00:03:44,110 --> 00:03:49,150 So let's say I want delete the one wait id 202. 52 00:03:49,300 --> 00:03:53,230 So now the end point or the root is going to be delete. 53 00:03:53,230 --> 00:03:56,080 So I provide to zero two. 54 00:03:56,110 --> 00:03:59,590 Now when I hit st indeed I have a message. 55 00:03:59,740 --> 00:04:02,590 Is that post deleted successfully? 56 00:04:02,830 --> 00:04:08,620 And you can see that we have two files now I can go ahead and then delete the rest. 57 00:04:08,620 --> 00:04:13,660 Let's say I want to provide the ID of two and or one. 58 00:04:13,690 --> 00:04:18,220 Let me say to let me hit send and you can see that post has been deleted. 59 00:04:18,220 --> 00:04:24,690 So let me create more post here and let's check the file and you can see that now I have two files, 60 00:04:24,700 --> 00:04:25,150 whatever. 61 00:04:25,150 --> 00:04:28,900 If I want to fetch a single record, I'm going to use this endpoint. 62 00:04:28,900 --> 00:04:33,160 So now I want to find a post with ID of one. 63 00:04:33,160 --> 00:04:35,440 It means I'm going to retrieve this post. 64 00:04:35,440 --> 00:04:36,550 So now have a look. 65 00:04:36,610 --> 00:04:39,490 And you can see that this is a post I have. 66 00:04:39,490 --> 00:04:46,690 What about if I want to update the same process I provide ID and let's say that this was going to be, 67 00:04:46,720 --> 00:04:52,630 let me say, updated the title only hit send and now have a look. 68 00:04:52,630 --> 00:04:57,010 And indeed I have one post being updated with a title of this. 69 00:04:57,010 --> 00:04:59,920 I can go ahead and update the description. 70 00:04:59,920 --> 00:05:01,600 Also, I will say that. 71 00:05:01,990 --> 00:05:03,910 Great as that. 72 00:05:04,310 --> 00:05:07,700 So let me hit send and now let's check it out. 73 00:05:07,700 --> 00:05:10,940 And indeed it has been updated, guys. 74 00:05:10,940 --> 00:05:12,860 So this is awesome project.