How to Extract Site Values from an Array and Save Them in a Variable in Postman

Learn how to effectively extract specific values from an array in Postman and store them in a variable using lodash functions.
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How to Extract Site Values from an Array and Save Them in a Variable in Postman

When working with APIs and responses in Postman, you may encounter situations where you need to extract specific values from an array and save them into a variable for later use. A common example of this is extracting site names such as "London," "Manchester," and "Birmingham" from a given array of objects. This post will show you how to do this effectively using lodash functions in Postman.

The Problem

Imagine you have a JSON response from an API that looks like this:

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

Your goal is to extract the site values into a separate variable for use in your testing or further processing.

The Solution using Lodash

To efficiently extract the site names from the JSON array, Postman allows the use of JavaScript along with lodash, a powerful utility library. Here’s how you can do it step by step:

Step-by-Step Extraction Process

Extract Site Names: You can utilize lodash’s _.map() function to iterate over the array and extract the site values.

Example Code

Below is the code you can use in your Postman tests to accomplish the extraction:

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

Explanation of the Code

let sites = _.map(res, 'site');: This line utilizes lodash’s map function to traverse the res array and pull out the site values into an array called sites.

_.property("site"): This is another way of defining the property you'd like to extract. You can use either method as per your preference.

Conclusion

Using lodash with Postman provides a simple yet powerful way to manipulate and extract necessary values from response data. By following the steps outlined, you can easily extract site names or any other fields from your API response. This approach not only helps streamline your testing process but also ensures you have access to the data you need for subsequent requests or assertions.

Now that you know how to extract site values in Postman, you can enhance your API testing capabilities significantly. Happy testing!