
Postman — API testing with ease
Presentation by Nazar Lobur, 2025
🌐 What is API Testing?
- HTTP-methods.
- Code status.
- Response body.
- Structure and format.
- Response time.
- Erors handling.
- Authorization.
🧪 Types of API-testing
Depending on the goal we test:
Functionality
Security
Productivity
Negative scenarios
Reliability
Errors handling
📦 Why i choose Postman?
Simple interface
Support tests with JavaScript
Save history
Support Authorization
📥 How to work with GET-requests
- We retrieve a list of users.
- Filter by parameters.
- Check whether anything
is displayed.
With GET-requests we are:

In case if request are broken i use console.

🔍 Query parameters = save time

Case sensitivity: createdAt ≠ CreatedAt
Wrong key = empty result or error
❗ Don't forget:

🗃️ Variables = cleanliness
and scalability
Benefits:
- Avoid duplication
- Switch between environments
- Update tokens, ID, URL

POST-requests: adding new data
POST-request allows to create new objects
POST /users/tenants {
"firstName": "Anna",
"email": "anna@example.com",
"phone": "123456789"
}
🗑️ DELETE-requests: delete data
DELETE /users/tenants/123
help us to remove some data
📏 Best practice of testing API (from experience)

-
Avoid hardcode — use variables
-
Always add validations
-
Structure collections by scenarios
-
Use pre-request scripts for tokens/data
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By TenantCloud
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