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Solution: List all records as JSON

From: Node.js Essential Training

Video: Solution: List all records as JSON

So, here's my solution to the challenge. I've already installed all the dependencies and I've started the application on port 3000. So, I'm going to go to port 3000 in my browser and then the /list/json route. Now, all the flight information is being displayed as JSON. So let's take a look at how I did this. I'm going to drag the final folder into sublime text two and then I'm going to go to routes slash index dot js. At the very bottom of this file, I created a new function called list json.

Solution: List all records as JSON

So, here's my solution to the challenge. I've already installed all the dependencies and I've started the application on port 3000. So, I'm going to go to port 3000 in my browser and then the /list/json route. Now, all the flight information is being displayed as JSON. So let's take a look at how I did this. I'm going to drag the final folder into sublime text two and then I'm going to go to routes slash index dot js. At the very bottom of this file, I created a new function called list json.

Then on line 42, I started a new blank array called flight data On line 44, I started a loop and iterated over all the flights. Then one by one I got the information from each flight object and pushed it into the array. Then, finally on line 48, I sent a res.json response back with the flight data. Then in app.js I attached the list json function to the route /list /json. Now one approach you may have taken while solving this challenge.

Was to just get all the data, from the data module and then send that as a JSON response. However, that doesn't quite work correctly and I'm going to show you why. First I'm going to comment out these lines and then I'm going to require that data again. I'm going to go var, flight data. Equals require and then I'm going to require that data. So this is the raw data that's seen in the data folder in index.js. So you might think that since this is a JavaScript object already, you could just send to the browser as JSON and it would be fine.

So I'm going to stop the server and I'm going to start it again. I'm going to press the up arrow on my keyboard, to get node app.js and I'm going to run it. And now, I'm going to pull up /list/json again. I'm just going to refresh the browser here. So this still displays correctly, but there's a problem with the data. And that's that the property names here are numbers. In JSON, you can't use numbers as the property names. So this is not valid JSON. By using the loop here, we're able to get the flight data and put it into an array.

Since we already have the flight numbers as a part of the data, we're not losing any information. So that's how you can deliver all of the flight data as valid JSON.

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This video is part of

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Node.js Essential Training

52 video lessons · 16273 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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