QALaunch Academy · Professional Course

API Testing & SQL

Expand your testing skills beyond the user interface. Learn how APIs really work, validate requests and responses, automate checks in Postman and REST Assured, and use SQL to confirm the data behind every API — the backend skills modern QA roles expect.

Explore the curriculum → View all courses

8In-depth modules

APIPostman & REST Assured

SQLDatabase validation

Capstone+ Interview prep

Why this course

Test the Layers Below the UI

Modern apps run on APIs and databases. This course teaches you to test those layers systematically and connect API checks with real data validation.

Understand APIs

HTTP fundamentals, REST concepts, endpoints, methods, headers, parameters, authentication and the shape of requests and responses.

Practice With Postman

Build and run API requests, write assertions, use collections, variables and environments, and create practical, repeatable API test workflows.

Validate With SQL

Write practical queries and use database validation to confirm that API operations actually produced the right data in the backend.

Curriculum outcomes

What You’ll Learn

The course combines API testing and SQL so you understand how the layers of an application work together.

REST API fundamentals & web services

HTTP methods, status codes & headers

Endpoints, parameters & request bodies

JSON request & response validation

Authentication & tokens (JWT / OAuth)

Postman collections, variables & environments

pm.test assertions & schema validation

Positive, negative & boundary API testing

SQL SELECT, WHERE, ORDER BY & filtering

Joins, GROUP BY & aggregate functions

Backend data validation for API testing

End-to-end API + database testing

8 modules

Course Curriculum

Each module builds on the last — from your first API request to validating data end to end. Click any module to start learning.

Free preview1Introduction to APIs & Web ServicesWhat APIs are, how clients and servers talk, and why testers test them directly.Open lesson → Free preview2HTTP Deep DiveMethods, status codes, headers and the request/response cycle every tester must know.Open lesson → Free preview3API Testing with PostmanBuild requests, organize collections and run your first real API tests in Postman.Open lesson → 🔒 Members only4Validating API Responses & AssertionsCheck status, body, schema and data so you know a response is actually correct.Open lesson → 🔒 Members only5API Authentication & Security TestingAPI keys, tokens, OAuth basics and the security checks testers should run.Open lesson → 🔒 Members only6SQL Fundamentals for TestersTables, rows, keys and SELECT/WHERE/ORDER BY to verify data in the database.Open lesson → 🔒 Members only7SQL Joins & Backend Data ValidationJoin tables and validate that the backend stored exactly what the API returned.Open lesson → 🔒 Members only8Capstone Project & Interview PreparationEnd-to-end API + SQL project and preparation for API/SQL testing interviews.Open lesson →

Career path

Where This Course Fits

API Testing & SQL is the second stage of the QALaunch journey — after manual foundations, before automation.

Build the Foundation

Manual testing concepts, techniques, test cases, defects and practical testing.

You are here2

Add API & SQL Skills

API testing, Postman, SQL and database validation for end-to-end testing.

Move Into Automation

Test design, frameworks, execution, reporting and CI/CD with Selenium + Java.

Get job-ready

Prepare for Interviews

Pick a topic to open its interview question bank — dozens of questions from Easy to Extreme, with real SQL and API coding questions plus model answers.

REST & API fundamentals HTTP methods & status codes Postman Response validation Authentication & security SQL fundamentals SQL joins & aggregations Backend data validation API automation Scenarios & debugging View all topics →

Ready to Expand Your Testing Skills?

Build on your manual testing foundation with API testing, Postman, SQL and database validation — the skills that open up stronger QA roles.

Start Module 1 →