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Learn how to efficiently remove duplicates and sort a JSON array A-Z in Node.js. This guide provides code snippets and explanations to help you achieve this task effortlessly.
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This video is based on the question https://stackoverflow.com/q/66367228/ asked by the user 'Adam' ( https://stackoverflow.com/u/880413/ ) and on the answer https://stackoverflow.com/a/66367522/ provided by the user 'Sandip Nirmal' ( https://stackoverflow.com/u/1904377/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Remove Duplicates and Sort JSON Arrays in Node.js

Working with JSON data is a common task for developers, especially when dealing with information retrieved from APIs or databases. One problem you might face is the need to clean up your data by removing duplicates and sorting it in a specific order. In this guide, we'll explore how to take a JSON array of city data in Node.js, remove any duplicate entries, and sort the remaining items in alphabetical order.

The Problem

Let’s say you have the following JSON array containing city data from Victoria:

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

What Do We Want To Achieve?

Remove duplicates: We want only one entry for 'Melbourne', disregarding any additional occurrences.

Sort the cities A-Z: The resulting object should be ordered alphabetically by city name.

The outcome we are looking for is a structure that looks like this:

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

The Solution

To achieve our goal, we can follow a simple three-step process:

Step 1: Create a New Object

We'll create a new object to store the processed data. By utilizing the city name as the key, we can ensure that duplicate entries are automatically filtered out.

Step 2: Populate the Object

We'll loop through the original array and add each unique city to our new object.

Step 3: Sort the Result

Finally, we will sort the object by its keys (city names) and build the output in the desired format.

Implementation

Here’s how we can implement this in Node.js:

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

Explanation of the Code

Initialization: We declare an object called citiesObj where we will store unique city entries.

Populating citiesObj: We use forEach to iterate through the original data array and populate citiesObj with city names as keys.

Sorting and Structuring: We retrieve the keys from citiesObj, sort them alphabetically, and then use reduce to create our final output object, ensuring that we format the city and region correctly.

Output: Finally, we log the sorted cities object containing unique entries.

Conclusion

With just a few lines of code, we have successfully removed duplicates from our JSON array and sorted it A-Z. This method can be easily adapted to work with different data structures and additional parameters as required. Feel free to incorporate this approach in your projects whenever you need to clean up and organize JSON data in Node.js!