How to Reference POST Body in Your Tests Using Postman

Описание: Learn how to successfully reference and utilize the POST body in your tests within Postman, avoiding common errors.
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This video is based on the question https://stackoverflow.com/q/68016325/ asked by the user 'Kevdog777' ( https://stackoverflow.com/u/696479/ ) and on the answer https://stackoverflow.com/a/68016738/ provided by the user 'malarres' ( https://stackoverflow.com/u/2729605/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Referencing the POST Body in Your Tests

When you are working with APIs, especially while testing with tools like Postman, it's common to need to reference the body of a POST request within your tests. However, a common issue developers face is getting an error message that says ReferenceError: body is not defined. This typically happens because you're trying to access the body of the request directly without the proper context or method.

In this guide, we'll explore a straightforward solution to help you correctly reference the UserName from your POST request body in your tests. Let's dive into how you can achieve this effortlessly.

Sample POST Request Body

Before we get to the solution, let's take a look at the structure of your POST request body. Here’s an example:

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The Error You Might Encounter

When trying to reference the UserName directly from the body, you might attempt something like this in your test script:

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

However, this will result in an error:

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This error occurs because the variable body is not directly accessible in the context of Postman's test scripts.

Step-by-Step Solution: Referencing POST Body in Tests

To successfully reference the POST body within your tests, follow these steps:

1. Logging the Request Body

To access the body of your POST request, you can utilize Postman's built-in pm.request object. Depending on whether you want to log the request or the response, you have two options:

To log the request body:

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To log the response body:

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2. Parsing the JSON Object

Since the body of your POST request is in JSON format, you will need to parse it to access its properties. Here’s how you can do that specifically for your case:

Accessing the UserName Property

Assuming you want to access the UserName from your request body, your test script should look like this:

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

3. Running Your Test

After implementing the above code in the Tests tab of your Postman request, run your tests. You should now see the UserName being logged without any errors!

Conclusion

Referencing the POST body in your tests in Postman doesn’t have to be tricky. By utilizing the Postman API effectively and parsing the JSON structure of your request body, you can easily access any property you need, such as UserName.

With this knowledge, you're now equipped to enhance your API testing experience and troubleshoot common errors efficiently. Happy testing!