Скачать или смотреть How to Extract Object Properties from a JSON Response Using Google Apps Script

Discover how to easily retrieve and manage object properties from a JSON response using Google Apps Script to build your own database of books from OpenLibrary API.
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How to Extract Object Properties from a JSON Response Using Google Apps Script

Introduction

If you're trying to build a comprehensive database to manage your books, you're likely faced with the challenge of retrieving essential metadata like titles and authors from an API, such as the OpenLibrary API. This task can become a bit tricky, especially given the complexity of JSON responses. Let's take a closer look at how you can dynamically extract object properties from a JSON response without hardcoding specific values, enabling you to efficiently manage your literature database.

The Problem

You've successfully set up your code to fetch metadata using the barcode (ISBN) of the books. However, when passing the ISBN to the OpenLibrary API, the returned JSON structure is dynamic. Each response includes a unique key, such as ISBN:9782505061373, which encapsulates the book’s metadata. The challenge lies in extracting the details from this response without hardcoding the ISBN key, since it changes with each request.

JSON Response Structure

Here’s a quick look at how the JSON response from OpenLibrary is structured:

[[See Video to Reveal this Text or Code Snippet]]

As you can see, the key "ISBN:9782505061373" is dynamic, making it necessary to programmatically access its properties.

The Solution

Let's break down the solution into straightforward steps that will allow you to extract the desired properties from the JSON response effectively.

Step 1: Fetch the Response

You’ve already got the code to fetch the response from the OpenLibrary API. Ensure it reads:

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This code grabs the JSON content using the ISBN.

Step 2: Parse the JSON Response

The next step is to convert the response into a usable JavaScript object. This can be done using:

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This line parses the string returned from the API into an object results, which you can work with.

Step 3: Dynamically Retrieve the ISBN Key

To avoid hardcoding the ISBN key, you can utilize the Object.keys() method to dynamically access it. Use the following line:

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This code retrieves the first key from the results object, which will be your dynamic ISBN key.

Step 4: Access Object Properties

With the isbnKey in hand, you can now extract the desired properties, such as title, URL, and any other relevant metadata. For instance:

[[See Video to Reveal this Text or Code Snippet]]

This allows you to access the properties without needing to know the key value beforehand.

Step 5: Write Data to Google Sheets

Finally, you can insert the retrieved values into your Google Sheets. Assuming you have set a reference to the active sheet, you can write the values as follows:

[[See Video to Reveal this Text or Code Snippet]]

In this line, properties would be an array of the metadata you wish to write to your sheet.

Conclusion

By following these steps, you can efficiently extract object properties from a JSON response without having to hard-code the dynamic ISBN keys. This process not only saves you time but also allows for a more flexible and scalable management of your book database. You can now focus more on building your collection and less on getting bogged down in the technicalities of API responses. Happy coding!