How to Write Tests in Postman | API Response Validation Step by Step | Part 12

Описание: In this video, we’ll learn how to write tests in Postman using JavaScript and validate an API response step by step.

We will use the FakeStore API to understand how real-world API responses look and how we can validate them using Postman’s Tests tab.

This video focuses on basic but very important API validations, which are commonly used in API automation and real-time projects.

🎯 What you will learn in this video:

✅ What is the Tests tab in Postman
✅ Is testing in Postman considered automation?
✅ Why Postman uses JavaScript for writing tests
✅ How to use Postman test snippets
✅ Understanding pm.test(), pm.response, and assertions

🧪 Validations covered in this video:

🔹 HTTP-level validations

Validate HTTP status code (200 OK)

🔹 Response structure validations

Validate response is a JSON

Validate response is an array

Understand square brackets [] as array

Understand curly braces {} as objects

Validate array contains multiple objects

Validate total number of products in response

🔹 Mandatory property validations

Validate each product object contains:

id

title

price

description

category

image

rating

🔹 Nested object presence

Validate rating exists

Validate rating contains:

rate

count

We also understand why we use loops (forEach) to validate multiple objects in a single response.

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#FakeStoreAPI