Get the Count of Values Inside a JSON Object with JavaScript

Learn how to efficiently count values in a JSON object using JavaScript, with a step-by-step guide, example code, and output.
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How to Get the Count of Values Inside a JSON Object in JavaScript

Working with JSON data is a common task in web development, especially when handling APIs and data exchanges. Sometimes, you may need to extract specific information, such as counting occurrences of certain attributes. In this post, we are going to discuss how to get the count of values inside a JSON object using JavaScript.

The Problem

Imagine we have a JSON array consisting of several objects, each containing properties like unit, account, and domain. Your goal is to count how many accounts exist for each unit and to retrieve the names of the accounts for each unit. The input JSON looks like this:

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

And you want the output to resemble the following format:

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

The Solution

We can achieve this by using JavaScript's reduce function, which allows us to iterate over the elements of the array and build a new result based on our needs. Below, we’ll break down the solution into easy-to-understand steps.

Step 1: Define the Data

First, let's begin by defining the JSON data as a JavaScript array of objects:

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

Step 2: Use the reduce Method

Next, we will use the reduce method to process each object in the array. Here’s how the logic works:

We check if the unit already exists in our result accumulator.

If it exists, we update the count and add the account to an array, ensuring unique account names using Set.

If it does not exist, we create a new entry for that unit.

Here's the implementation:

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

Step 3: Convert to an Array and Display the Result

After reducing the data into an object format, we can convert the result into an array and log it to the console:

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

Final Output

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

Conclusion

Using JavaScript's reduce method makes counting and aggregating data from a JSON array both efficient and easy. This approach allows you to gather insights into your dataset without cumbersome loops or excessive conditional checks. The example provided showcases how to manage duplicates and create an organized output format.

By breaking down the problem into manageable steps, you can apply similar techniques to other data structures and use cases. Happy coding!