API

API Testing — Course #701 · REST · GraphQL · SOAP

Test Every API with
Confidence & Precision 🔌

APIs are the backbone of modern software — every mobile app, web app, and microservice communicates through APIs. Master REST, GraphQL, and SOAP API testing using Postman, RestAssured, and JMeter. Learn functional, performance, and security testing to ensure your APIs are reliable, fast, and secure.

REST APIsGraphQLSOAPPostmanRestAssuredJMeterOAuthJWTOpenAPINewman

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Postman Pre-Request & Test Scripts

// Postman — Test Script (JavaScript)
pm.test("Status is 200 OK", () => {
pm.response.to.have.status(200);
});

pm.test("Response has user id", () => {
const json = pm.response.json();
pm.expect(json).to.have.property('id');
pm.expect(json.id).to.be.a('number');
});

pm.test("Response time < 500ms", () => {
pm.expect(pm.response.responseTime)
.to.be.below(500);
});

// Set env var for chaining
pm.environment.set("userId",
pm.response.json().id);

What You Will Learn

Complete API Testing Mastery

From manual Postman tests to automated RestAssured frameworks, performance testing, and API security.

🔌

REST & GraphQL API Testing

Master the complete API testing lifecycle — understand HTTP methods (GET/POST/PUT/DELETE/PATCH), status codes, headers, and request/response bodies. Test REST endpoints with Postman and GraphQL APIs with Postman's GraphQL support. Validate JSON/XML schemas, chain requests using environment variables, and automate with Newman CLI for CI/CD integration.

REST CRUDGraphQL QueriesStatus CodesJSON SchemaNewman CLIEnvironmentsCollectionsAuth Flows

⚡

Performance Testing

Load test APIs with Apache JMeter — simulate 1000+ concurrent users, analyze response times, throughput, and identify bottlenecks.

🛡️

API Security Testing

OWASP API Security Top 10 — test for authentication bypass, injection, broken access control, rate limiting, and data exposure.

🤖

RestAssured & Automation

Java-based API automation with RestAssured — BDD-style tests, JSONPath response validation, and TestNG/JUnit integration for regression suites.

🚀

CI/CD Integration

Newman CLI runs Postman collections in GitHub Actions and Jenkins — automated API test results on every pull request and deployment.

Curriculum

8-Module Complete Syllabus

Structured from fundamentals to advanced automation — everything you need to become an API Testing expert.

What is an API? Types — REST, SOAP, GraphQL, gRPC
HTTP Protocol — Methods, Status Codes, Headers
Request & Response Structure — JSON and XML
Authentication — API Keys, Basic Auth, OAuth 2.0, JWT
API Testing vs UI Testing — What, Why, When
API Testing Tools Overview — Postman, SoapUI, RestAssured, JMeter

Installing Postman & Workspace Setup
Sending GET, POST, PUT, PATCH, DELETE Requests
Working with Headers, Query Params & Path Params
Understanding JSON & XML Response Formats
Writing Postman Test Scripts with JavaScript (pm API)
Collections — Organizing & Sharing API Tests

Environments & Variables — Global, Collection, Local
Pre-Request Scripts & Dynamic Data with Faker
Data-Driven Testing with CSV & JSON Data Files
Mock Servers in Postman for API Simulation
Postman Flows for Visual API Chaining
Newman CLI — Running Collections from Command Line

RestAssured Setup in Maven/Gradle Project
Given-When-Then BDD Syntax in RestAssured
GET, POST, PUT, DELETE Request Automation
JSON Path & XML Path for Response Validation
Handling Authentication — Basic, Bearer, OAuth
Integration with TestNG & JUnit for Test Suites

What is GraphQL? Queries, Mutations, Subscriptions
GraphQL Schema & Introspection
Testing GraphQL with Postman — Query Variables
GraphQL Testing with jest-graphql-client
Validating GraphQL Responses & Error Handling
GraphQL Security Testing — Query Depth, Introspection Disable

Apache JMeter Architecture & Installation
Creating Thread Groups, Samplers & Listeners
HTTP Request Sampler for REST APIs
Analyzing Results — Response Times, TPS, Error Rate
Distributed Load Testing with JMeter Slaves
Integrating JMeter with Jenkins CI/CD

OWASP API Security Top 10 — 2023 Edition
Testing for Broken Authentication & Authorization (BOLA)
Injection Attacks — SQL, NoSQL, Command Injection via APIs
Sensitive Data Exposure & Improper Assets Management
Rate Limiting & Mass Assignment Testing
Using OWASP ZAP for API Security Scanning

Integrating Newman in Jenkins Pipelines
GitHub Actions for API Test Automation
Docker-Based API Testing Environments
Contract Testing with Pact.io
API Mocking with WireMock & Mockoon
API Documentation — Swagger/OpenAPI 3.0 & Postman Docs

Career Outcomes

High-Demand Roles & Salaries

API testing skills unlock senior QA and security engineering roles across global tech companies.

₹8–28L

India Avg LPA

$90K–$165K

USA Avg

32K+

Active Jobs

40% Growth

Year-on-Year

API Test Engineer

Design and execute API test suites using Postman, RestAssured, and Newman for RESTful and GraphQL services

₹8–25 LPA · $90K–$155K USA

API Security Engineer

Test APIs for OWASP Top 10 vulnerabilities, authenticate flows, and perform penetration testing on API endpoints

₹12–32 LPA · $100K–$170K USA

Performance Test Engineer

Load test APIs with JMeter, identify bottlenecks, and optimize API performance for high-traffic production systems

₹10–30 LPA · $95K–$165K USA

Test Automation Architect

Lead API testing strategy, design test frameworks, define CI/CD integration, and mentor QA teams

₹18–50 LPA · $130K–$195K USA

Test Every API with Confidence & Precision 🔌

Complete API Testing Mastery

8-Module Complete Syllabus

High-Demand Roles & Salaries

Ready to Master API Testing?

Test Every API with
Confidence & Precision 🔌