API testing using Postman

Data-Driven; API Chaining; Environment Management; Automation

What you’ll learn
✓ Utilize Postman for core API operations, sending HTTP requests (GET, POST, PUT, DELETE) and managing environments, variables, and collections effectively
✓ Develop automated test scripts and assertions using JavaScript in Postman to validate response codes, bodies, performance, and data integrity.
✓ Implement data-driven testing and CI/CD integration, parameterizing tests with files and automating execution via Newman CLI within DevOps pipelines.
✓ Execute comprehensive API testing strategies, designing and conducting functional, security, and performance tests while leveraging mocking and monitoring for e

Requirements
● No experience required, or Black Box Test Engineer

Description
This course contains the use of artificial intelligence. AI-powered translation services or voice cloning for multi-language versions.

A Complete Guide to API Testing Using Postman

This guide provides a comprehensive overview of API testing with Postman, covering fundamentals, advanced techniques, automation, and integration into enterprise workflows.

1. Introduction to APIs and API Testing

• What is an API?
An API (Application Programming Interface) is a set of rules that enables communication between applications or devices.

• API Testing Definition
API testing validates the functionality, reliability, performance, and security of APIs. It ensures that APIs meet design specifications and behave as expected under various conditions.

2. Postman: An Essential Tool for API Testing

Postman is a widely used platform for designing, testing, and documenting APIs. It supports

• Sending HTTP requests (GET, POST, PUT, DELETE, etc.)

• Organizing requests into Collections

• Writing Pre-request Scripts and Test Scripts in JavaScript

• Managing Variables (Global, Collection, Environment, Local, Data)

• Automating tests with Collection Runner and Newman CLI

3. Core Testing Features in Postman

Basic Testing

• Simulating various HTTP methods and content types (JSON, XML, form-data, etc.)

• Writing assertions to validate

• Status codes (e.g., 200, 201)

• Response body content

• Headers and cookies

• Response time (performance)

• JSON schema compliance

Advanced Testing

• Data-Driven Testing: Using CSV/JSON files to parameterize requests

• API Chaining: Passing data between requests using variables

• Environment Management: Switching between different setups (dev, test, prod)

• Automation: Running collections via CLI with Newman and generating HTML reports

• Mock Servers: Simulating API responses for parallel development

4. API Testing Types & Strategies

• Functional Testing: Validating API logic, input/output accuracy, and error handling

• Reliability Testing: Ensuring consistent performance under repeated use

• Security Testing: Checking authentication, authorization, and injection vulnerabilities

• Performance Testing: Measuring response times and scalability (can integrate with JMeter)

• Interoperability Testing: Verifying integration with other systems and data formats

• Penetration Testing: Simulating attacks to identify security flaws

5. API Design & Development Best Practices

• RESTful Principles: Using HTTP methods appropriately (GET, POST, PUT, DELETE)

• API-First Approach: Designing APIs before implementation to improve collaboration

• Documentation: Using OpenAPI/Swagger for interactive API docs

• CI/CD Integration: Automating API tests within development pipelines

6. Enterprise-Level API Automation

• Postman in CI/CD: Integrating with Jenkins, GitLab, and Docker

• Monitoring: Using Postman Monitors to track API health and performance

• Governance & Security: Enforcing API standards and security rules via CLI

• Collaboration: Sharing collections, environments, and reports across teams

7. Interview Q&A & Key Takeaways

Common questions include

• Explain HTTP methods and status codes.

• How does Postman handle authentication (OAuth, API keys, JWT, etc.)?

• Describe variable scopes in Postman.

• How do you automate API tests in Postman?

Who this course is for
■ Self-testing developer, junior test engineer, black-box test engineer

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