1 00:00:01,350 --> 00:00:02,460 In this video. 2 00:00:02,460 --> 00:00:06,810 Let's see how we can handle invalid object ID. 3 00:00:06,840 --> 00:00:09,690 Let me show you an example of such error. 4 00:00:09,900 --> 00:00:17,760 Inside the server file I have added one root where we are going to fetch a particular post by ID and 5 00:00:17,760 --> 00:00:26,250 I pass in the query as red dot params dot id and I'm sending the response for success and error here. 6 00:00:26,280 --> 00:00:33,510 So with this one, let's try to make a request and see the kind of error if we fail to pass in the valid 7 00:00:33,510 --> 00:00:34,950 MongoDB ID. 8 00:00:35,280 --> 00:00:42,420 So inside our request here I have added one endpoint call for a slot post and then forwards like the 9 00:00:42,420 --> 00:00:43,170 ID. 10 00:00:43,200 --> 00:00:47,900 And let me add any ID here to be first when I hit send. 11 00:00:47,910 --> 00:00:55,080 And here is a message you can see that we have some random string of characters here and this message 12 00:00:55,080 --> 00:00:59,460 is not all that descriptive, even if you are new to MongoDB. 13 00:00:59,490 --> 00:01:06,300 So we are going to customize this one and take this message and add our own custom message to it. 14 00:01:06,960 --> 00:01:13,860 And for this message, we can see that the type of the error is called cast error. 15 00:01:14,010 --> 00:01:19,520 So we can create a function called handle cast error to handle this. 16 00:01:19,530 --> 00:01:23,370 So back to our folder that is under utils. 17 00:01:23,400 --> 00:01:31,730 We can create one file to contain all this error types or we can create a specific file for each. 18 00:01:31,740 --> 00:01:34,590 So let's break it down into error types. 19 00:01:34,590 --> 00:01:37,260 So here our mix of handle. 20 00:01:40,490 --> 00:01:41,300 Past. 21 00:01:43,160 --> 00:01:49,850 Error dot JS and this is how we are going to create its cost handle. 22 00:01:53,870 --> 00:01:57,220 Test error is equal to differently. 23 00:01:57,230 --> 00:02:02,120 Our pass in the entire error object here as we did before. 24 00:02:02,150 --> 00:02:03,530 Here we go. 25 00:02:03,530 --> 00:02:10,970 So here let's add our custom error message and going to be as const, and then I'll assign to a variable 26 00:02:11,000 --> 00:02:12,080 called error. 27 00:02:12,350 --> 00:02:17,900 And here we go back tick and then our add invalid. 28 00:02:17,990 --> 00:02:23,570 And then to be able to know, I want to grab the path and the value. 29 00:02:23,600 --> 00:02:28,820 And the path is the ID and the value is what is this one? 30 00:02:28,820 --> 00:02:35,410 So I can combine these two to send some meaningful message than using this message here. 31 00:02:35,420 --> 00:02:38,780 So this I'm going to do for the error objects. 32 00:02:38,780 --> 00:02:45,800 We have the path as the last sign Kerberos is the error and then dot path. 33 00:02:46,130 --> 00:02:54,650 And next is I will add colon and then I will inject the value for that going to be as the error. 34 00:02:54,650 --> 00:02:57,380 And on that we have the value. 35 00:02:57,380 --> 00:03:01,970 So here I need to send this error to the global error handler. 36 00:03:01,970 --> 00:03:05,030 So I'll bring in the app error here. 37 00:03:05,870 --> 00:03:10,100 So I think the auto import is not working to make sure that it's working. 38 00:03:10,130 --> 00:03:15,380 Go ahead and then save again and come back to the file where you want to import. 39 00:03:15,380 --> 00:03:17,570 And I think it should be working. 40 00:03:17,660 --> 00:03:19,430 And this is the magic. 41 00:03:19,460 --> 00:03:20,300 It's working. 42 00:03:20,300 --> 00:03:25,910 So here I'm going to send the entire response as message to cast. 43 00:03:25,910 --> 00:03:29,630 And then the message is going to be as this. 44 00:03:29,630 --> 00:03:33,470 So I will call the instance of the app error. 45 00:03:33,500 --> 00:03:40,280 Then I'll pass in the message that the customized message and then the status code, which is 400. 46 00:03:41,090 --> 00:03:45,190 And next is let me return the entire message. 47 00:03:45,200 --> 00:03:54,020 So last step is let's go ahead and then export this file or this function as handle cast error. 48 00:03:54,170 --> 00:04:00,020 So let's get back to the thing and pass in the error. 49 00:04:00,020 --> 00:04:00,310 Rather. 50 00:04:00,320 --> 00:04:02,710 Sorry, you're going to be the error here. 51 00:04:02,720 --> 00:04:03,200 Yeah. 52 00:04:04,040 --> 00:04:04,390 Good. 53 00:04:04,400 --> 00:04:10,520 So inside the root where I want to handle such cases, that is the where is the server file? 54 00:04:10,760 --> 00:04:11,820 Which is this one. 55 00:04:11,840 --> 00:04:16,490 Let me close this up error and this is where I want to handle such error. 56 00:04:16,579 --> 00:04:20,480 So here I'll bring in the cost error here. 57 00:04:20,480 --> 00:04:26,630 So let me require it here as handle cast error. 58 00:04:27,050 --> 00:04:35,930 The auto import is working fine and inside here, as we did for the handle validation error, we are 59 00:04:35,930 --> 00:04:37,370 going to do the same things. 60 00:04:37,370 --> 00:04:41,750 Our call next and I'll pass in the handle cast. 61 00:04:41,750 --> 00:04:46,740 Then I'll pass in the entire error object and that is it. 62 00:04:46,760 --> 00:04:50,480 So now let's go ahead and make a request and see. 63 00:04:50,480 --> 00:04:57,230 And this time around you can see that we have some meaningful message as invalid ID, which is this 64 00:04:57,230 --> 00:05:00,710 one if I pass in the correct ID. 65 00:05:01,560 --> 00:05:07,090 So let's make a request to create a post so that we can have the valid ID. 66 00:05:07,110 --> 00:05:16,170 So let's pass in the payload as that title and I will say h HTML and then for the content. 67 00:05:22,150 --> 00:05:24,070 I would say the best. 68 00:05:26,220 --> 00:05:27,840 So let's end. 69 00:05:27,840 --> 00:05:34,740 And now it has been created and let me copy the ID and get back to the single here and make requests. 70 00:05:34,740 --> 00:05:37,130 And now it works fine. 71 00:05:37,140 --> 00:05:43,560 So these include any time you want to handle a customized error for a specific error type. 72 00:05:43,560 --> 00:05:50,760 So first of all, look at the error type and see how we can customize it after that, send that customized 73 00:05:50,760 --> 00:05:55,290 message to the global error handler and you'll be good to go.