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Handling GET requests returning JSON

From: Node.js Essential Training

Video: Handling GET requests returning JSON

Express is designed to make it easy to define and handle HTTP routes. In this video, we'll define several routes and use the module from the previous chapter to handle them. First, let's go to the exercise files. Go to video two, and then copy the start folder onto the desktop. Now I'm going to change directory to this folder. I'm going to type cd space, and then I'm going to drag this folder into terminal. Since I'm pulling these from the exercise files, I need to install the node modules, and to do that, I'm going to type npm, space, install.

Handling GET requests returning JSON

Express is designed to make it easy to define and handle HTTP routes. In this video, we'll define several routes and use the module from the previous chapter to handle them. First, let's go to the exercise files. Go to video two, and then copy the start folder onto the desktop. Now I'm going to change directory to this folder. I'm going to type cd space, and then I'm going to drag this folder into terminal. Since I'm pulling these from the exercise files, I need to install the node modules, and to do that, I'm going to type npm, space, install.

So now the node modules are installed. Now let's start building out this application. In the exercise files and video two, there's a folder named flight. This is the module that we developed earlier in the course. I'm going to copy this folder and paste it into start. Now let's edit the code. Open the folder in Sublime Text or any other text editor. First, let's go to routes, and index dot js. The first thing we want to do is get that flight module. So make a little bit of room, and then type var, flight, and then an equals sign, and then require, and then a double dot, / flight.

We're using double dot here because we need to go up one level in the directory tree. Now let's create a couple of objects based on the flight module. Go back to the exercise files and open up snippets.js. Copy everything from line three to line seventeen. And then paste it beneath line six. Now we have two flights, flight one and flight two. They're both based off the flight module that we've included in this project. Next, let's define some functions that will return the flight information to the browser.

I'm going to change exports dot index to exports dot flight1 and then instead of calling a render method I'm going to call the json method. And then finally, I'm going to pass in the flight information. To get that flight information, I'm going to type flight1.getInformation, and then I'm going to call that function. I'm going to do the exact same thing for flight two. Now let's define some routes to call these functions. Go to app.js, and then, change app.get slash, to flight one.

And now use the flight one function that we've defined in the routes object. Do the same for flight two. Now let's start the server, and go to these routes. Go to terminal and type in node, space, app. And then press return. So now the server is listening on port 3000. Let's go to localhost@port3000, and then /flight1. It's currently displaying all of the flight information in json format. Now if you work with json data on a regular basis, I recommend installing the jsonview extension for Google Chrome.

It's what's formatting all the json data here with the coloring. It's available as a free download from the Google Chrome store. Let's also take a look at flight two. Again, it's displaying the flight information in json format. The airline management application now handles a couple of statically defined flights at specific URL's. While this is helpful for getting a handle on how Express works, it's not very scalable for handling larger sets of data. In the next video, we'll look at more flexible ways of handling an indefinite number of flights.

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This video is part of

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Node.js Essential Training

52 video lessons · 16303 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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