Скачать или смотреть How to Retrieve a Key from a Specific Position in JSON Using Google App Script

Discover how to easily extract nested keys like `key11` to `key44` from a JSON object in Google App Script with clear examples and explanations.
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This video is based on the question https://stackoverflow.com/q/63980039/ asked by the user 'Olga Ivanova' ( https://stackoverflow.com/u/10610683/ ) and on the answer https://stackoverflow.com/a/63980137/ provided by the user 'gaetanoM' ( https://stackoverflow.com/u/3880585/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Retrieving Keys from JSON in Google App Script

JSON (JavaScript Object Notation) is widely used for data interchange, especially in web applications. However, sometimes, accessing specific values or keys deeply nested within JSON objects can be challenging. In this guide, we'll focus on how to retrieve keys from a particular position in a JSON structure when working with Google App Script.

The Problem

Consider the following JSON structure:

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

Suppose you want to retrieve specific keys like key11, key22, key33, and key44. A user has already been successful in retrieving the top-level keys (key1 to key4), but the challenge lies in fetching the corresponding child keys.

Solution Overview

To effectively extract nested keys, we will use the Object.keys() method in JavaScript, which helps to obtain the key names from an object.

Step-by-step Guide to Retrieve Nested Keys

Fetch JSON Data: First, we need to parse the JSON that we retrieve from a URL or any other source. In our case, we will use a predefined JSON object for simplicity.

Get Top-level Keys: Use Object.keys() to get an array of the top-level keys from the paths object.

Extract Each Nested Key: Within a loop, access each key's corresponding object and use Object.keys() again to fetch the nested keys.

Here's how you can implement this in Google App Script:

Sample Code

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

Explanation of the Code

Step 1: We define a sample JSON data which resembles the structure you want to work with.

Step 2: The line var keys = Object.keys(data.paths); retrieves the array of top-level keys (in this case, key1, key2, key3, key4).

Step 3: The loop iterates through each key in keys. For each iteration, it accesses the corresponding object and retrieves the first child key using Object.keys(data.paths[keys[a]])[0].

Final Thoughts

This approach allows you to efficiently navigate nested JSON structures and pull out keys as needed, making it easier to handle and manipulate JSON data within your Google App Scripts. Whether you need to retrieve values or process data, understanding how to access these keys can greatly enhance your scripting capabilities.

Utilize this method to improve your JSON handling skills in Google App Script!