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Modifying data through PUT requests

From: Node.js Essential Training

Video: Modifying data through PUT requests

When you're working with HTTP, get requests are strictly intended for reading data. However, sometimes you need to modify data. In this video we'll configure Express to handle other types of requests. Let's get the exercise files going. Open up chapter 5, video 4, and then copy the start folder to your desktop. Now let's install the modules. Go to Terminal, and then change Directory to that Start folder. I'm going to drag this folder into Terminal to get the path. Now type npm install.

Modifying data through PUT requests

When you're working with HTTP, get requests are strictly intended for reading data. However, sometimes you need to modify data. In this video we'll configure Express to handle other types of requests. Let's get the exercise files going. Open up chapter 5, video 4, and then copy the start folder to your desktop. Now let's install the modules. Go to Terminal, and then change Directory to that Start folder. I'm going to drag this folder into Terminal to get the path. Now type npm install.

Now I'm going to drag the Start folder onto Sublime Text. Let's take a look at app.js. Currently there is just one route defined. It's the flight number route. Let's add another route we can use for marking specific flights as arrived. Instead of using a get request, I'm going to create a put request using the put method. This path is going to be similar, but I'm going to add arrived to the end. We're using put because we're making changes to data on the server. Let's also change to a different function name.

I'm going to call this arrived. Now, when I first started building web applications, I didn't really pay much attention to the verbs used in HTTP requests. I knew that if I set the method on a form element to get, all of the form data would appear in the URL, but if I set it to post, it wouldn't. I eventually learned more about HTTP verbs and the intent behind them. To learn more about HTTP, I recommend watching David Gassner's web services title in the lynda.com library, particularly the chapter on using Restful Web services.

Now let's go back to the code and create a function to handle that put request. We've already decided we want that function to be named arrived so let's go to routes and index.js and then create a new function called arrived. Just like the get function we're going to receive the request and response objects as arguments. This function is going to be very similar to the get function with a few minor differences. So let's copy the entire body of the get function, and paste it down into arrived. First, we're going to use the trigger arrive method to change the flight record.

And now, instead of sending back the flight information, we're going to send a status. So now, let's go to the server, and test. I'm going to start the server by typing node app, and then return. Looks like there's a small parse error in my code. Let's go back. Instead of typing a semicolon, I typed an l. Let's fix that. Now, let's try starting the server again. So after taking care of the parse error, the server is now listening on port 3000. Just as before, I can load up flight information. So I've loaded up flight 33.

Now, what I need to do is create a put request, so I can mark this flight as arrived. In the past, I've used quick HTML-markup forms to get the browser to help me generate post requests to the server. While this worked for me when I was in a pinch, it's very limiting. You can't use every HTTP verb in a form element, and you can't customize your requests with different headers. Command line tools like Curl are much more flexible. But they tend to be cumbersome if you don't remember all of the flags.

These days, I use a tool called Postman. Now, don't worry. It lets you do far more than post requests. Postman lets you craft HTTP requests exactly the way you want them. Without the need to learn a bunch of command line options for something like Curl. It's available as a free download from the Google Chrome store. So now, lets generate this put request. I am going to copy the URL that I used for the get request and paste it in here. Then I am going to add /arrived to the end of the URL.

Now I am going to change the method to put, now to make this request all I need to do is click the Send button. It kicks back a status of done. And now I can go back to the original record and hit refresh and it'll give me the actual arrive property. Routing different HTTP verbs in Express is as easy as using different methods. As you build out an API, using the appropriate verbs will help other programmers know how to use your service. Routing different HTTP verbs in Express is as easy as using different methods.

As you build out an api using the appropriate verbs will help other programmers know how to use your service. In the next video we'll look at ways of adding functions applying to all HTTP requests.

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This video is part of

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Node.js Essential Training

52 video lessons · 12309 viewers

Joseph LeBlanc
Author

 
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  1. 3m 9s
    1. Welcome
      42s
    2. What you should know before watching this course
      57s
    3. Using the exercise files
      47s
    4. Using the challenges
      43s
  2. 18m 50s
    1. Why use Node.js?
      2m 1s
    2. Choosing a Node.js installation process
      4m 56s
    3. Installing Node.js on the Mac
      2m 5s
    4. Installing Node.js on Windows
      1m 43s
    5. Installing Node.js via Node Version Manager on Ubuntu Linux
      4m 45s
    6. Installing Node.js via Node Version Manager on a Mac
      3m 20s
  3. 13m 54s
    1. Exploring language additions to the V8 JavaScript engine
      3m 38s
    2. Understanding require() and modules
      6m 39s
    3. Understanding callback execution in the event loop
      3m 37s
  4. 12m 23s
    1. Initializing Node.js projects
      2m 37s
    2. Finding an NPM
      3m 30s
    3. Maintaining projects using the npm command
      6m 16s
  5. 21m 4s
    1. Creating modules with getters and setters
      6m 33s
    2. Understanding module caching and scopes
      6m 15s
    3. Implementing JavaScript creational patterns
      5m 8s
    4. Challenge: Leveraging module caching
      55s
    5. Solution: Leveraging module caching
      2m 13s
  6. 32m 27s
    1. Starting Express applications
      3m 42s
    2. Handling GET requests returning JSON
      3m 26s
    3. Navigating large datasets using request variables in routes
      5m 4s
    4. Modifying data through PUT requests
      4m 32s
    5. Supplying middleware to modify HTTP response headers
      4m 37s
    6. Generating HTML views in Jade
      8m 9s
    7. Challenge: List all records as JSON
      37s
    8. Solution: List all records as JSON
      2m 20s
  7. 25m 37s
    1. Evaluating unit testing methodologies
      3m 8s
    2. Isolating existing code for testing
      6m 47s
    3. Supplying helpers for test data
      2m 35s
    4. Writing unit tests with Mocha
      6m 5s
    5. Simulating HTTP requests with SuperTest
      7m 2s
  8. 28m 45s
    1. Connecting to MongoDB via Mongoose
      4m 16s
    2. Defining schemas for collections in Mongoose
      3m 47s
    3. Querying MongoDB collections
      5m 32s
    4. Persisting Express sessions through MongoDB and mongo-connect
      7m 6s
    5. Logging in to Express applications using Passport
      8m 4s
  9. 21m 47s
    1. Controlling the built-in REPL
      4m 18s
    2. Constructing a custom REPL
      5m 40s
    3. Receiving command-line arguments with Optimist
      6m 14s
    4. Building command-line tools
      3m 35s
    5. Challenge: Launch a custom REPL from a command
      41s
    6. Solution: Launch a custom REPL from a command
      1m 19s
  10. 15m 46s
    1. Emitting events and attaching listeners
      5m 32s
    2. Streaming chunked data through readable streams
      2m 33s
    3. Controlling readable streams
      1m 52s
    4. Piping readable data into writable streams
      2m 10s
    5. Handling duplex streams over TCP
      3m 39s
  11. 4m 6s
    1. Deploying projects to cloud hosting services
      2m 36s
    2. Finding Node.js resources
      1m 30s

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