Comprehensive course on API testing concepts, independent of any specific tool. Covers REST, GraphQL, authentication, contract testing, performance, and testing strategy. The theory course that underpins all API testing tool courses.
// course
everything software testing
All your QA resources
One practical hub.
Tools, roadmaps, cheat sheets, checklists, interview prep, code snippets, utilities, AI workflows and many more, testers reach for every day - curated, searchable and copy-paste ready — organised around the work QA actually do.
>search "flaky test"⌘K
// take a look inside
The whole library, one click away
Tools, ready-to-paste snippets, cheat sheets, and AI guides — flip through what's inside. Click a tab to drive it yourself.
// 200+ tools across 37 categories
🌲
Cypress
Fast, reliable E2E testing.
// e2e · freemium
🎭
Playwright
True cross-browser automation.
// e2e · open-source
🥒
Cucumber
BDD with Gherkin scenarios.
// bdd · open-source
📮
Postman
GUI-first API testing.
// api · freemium
⚡
k6
Script-driven load testing.
// perf · freemium
🔍
Selenium
The original WebDriver standard.
// e2e · open-source
// snippets · configs · patterns · templates
Snippet
Custom login command
Session-cached cy.login helper.
// cypress · typescript
Config
playwright.config.ts
Multi-browser starter config.
// playwright · typescript
Template
Bug report
RCA fields, env snapshot.
// reporting · markdown
Pattern
Page Object Model
Typed, chainable POM.
// cypress · page-objects
Snippet
Reuse login state
storageState across test files.
// playwright · typescript
Config
cypress.config.ts
TypeScript starter config.
// cypress · typescript
// cypress & playwright commands
cypress.md
// navigate & interact
cy.visit('/login')
cy.get('[data-cy=email]')
.type('a@b.com')
cy.contains('Submit')
.click()
// assert
cy.url().should('include', '/dash')
playwright.md
// navigate & fill
await page.goto('/login')
await page.fill('[data-cy=email]',
'a@b.com')
await page.click('text=Submit')
// assert
await expect(page)
.toHaveURL('/dash')
// ai for test documentation
AI test plans8m
Acceptance criteria → test plan.
// guide · prompt included
Req → test cases9m
User story to cases, no hallucinations.
// guide · template
Traceability8m
Map requirements to coverage.
// guide · prompt included
AI bug reports7m
Broken → reproducible defect report.
// guide · template
Synthetic test data11m
Realistic data without touching PII.
// guide · prompt included
Edge case discovery9m
Boundary values manual design misses.
// guide · prompt included
// by the numbers
200+
Tools
30+
AI guides
90+
Cheat sheets
30+
Courses
7
Roadmaps
900+
Interview Qs
300+
Glossary
60+
Utilities
// grow as a tester
From test idea, to confident release
Every route is mapped to real QA work — so you move from learning to shipping decisions faster.
Learn QA
Build a strong testing career
Manual testing, test design, bug reporting, SDLC, Agile and risk-based thinking — in the right order.
Choose tools
Pick the right tool for the job
Compare automation, API, performance, reporting, test-data and observability tools side by side.
AI for QA
Use AI without losing judgement
Generate test ideas, sharpen bug reports, create synthetic data and review automation code — with prompts you can copy.
ai-test.spec.ts
Interview prep
Walk into QA interviews ready
Real questions by topic, seniority and role — each with a model answer and the pitfall to avoid.
Common bugs
Debug common product failures
Symptoms, root causes, repro steps and automation ideas for the bugs every tester meets.
// how it works
Okay — where do I start?
qa.codes is organised the way testers actually work: search, follow a path, then apply.
01
Search
Find tools, terms, checklists, prompts, utilities and guides from one command-style search.
02
Follow a path
Use roadmaps, courses and practical projects to build skills in the right sequence.
03
Apply at work
Drop templates, checklists, snippets and utilities straight into real QA tasks and releases.
// featured this week
Hand-picked this week
A few things worth your time right now — a course, a fresh post, a tool comparison and a copy-ready template.
Most teams over-abstract too early. Four custom commands are worth writing on every Cypress project — login, seed, intercept, visit. The rest can wait.
// blog · 7 min
Steps to reproduce, expected vs actual behaviour, environment details, and severity. For Jira, Linear, GitHub Issues.
// template · copy
// explore everything
Everything QA, organized
Six routes through the whole library — pick by what you’re trying to do, from first test case to shipping decisions.
Learn
Testing fundamentals, Cypress & Playwright with TypeScript, API Testing Masterclass, Python for QA and more.
30+ coursesPractice
Practice apps, project samples, assignments and hands-on QA scenarios — learn by doing.
7 apps · 37 tasksUse at work
Cheat sheets, snippets, configs, patterns, templates, checklists, curated links and recommended picks.
copy-readyDecide
Tools & comparisons — Cypress vs Playwright, Postman vs Bruno, REST Assured vs Karate and more.
200+ toolsCareer
Interview prep with real questions, model answers, pitfalls, seniority and role-based tracks.
26 topicsAI
AI Hub, AI Prompt Library, Prompt Engineering and Agent Skills for QA workflows.
30+ guides// career roadmaps
Pick a path, not a pile of links
All roadmaps →Seven guided routes — each a sequence of phases, topics, and the tools that matter for that role.
Beginner → Intermediate
Manual → Automation
You write test cases by hand today. You want to write test code by next quarter. This is the route.
// 13 topics · ~12 weeks
Intermediate
API testing specialist
Most production bugs ship through APIs. Become the person who catches them before the UI does.
// 10 topics · ~10 weeks
Intermediate → Advanced
Performance testing engineer
Slow is the new broken. Learn to find the bottleneck before users do.
// 10 topics · ~10 weeks
Intermediate
AI-augmented QA engineer
Use AI to ship more tests with less typing. Practical workflows for testing engineers, not buzzwords.
// 11 topics · ~8 weeks
Advanced
SDET / test infrastructure
Stop writing tests. Start building the platform that lets your team write better tests, faster.
// 12 topics · ~10 weeks
Intermediate
Mobile testing
Mobile apps fail differently from web. Different tools, different devices, different bugs. Become the tester who catches mobile-specific issues before users do — across iOS and Android, native and cross-platform.
// 12 topics · ~10 weeks
// resources
Ready-to-use. Copy and Go.
Snippets, configs, templates, and checklists built for real QA work — paste into your project and ship.
Cheat Sheets90+
Quick-reference sheets for Playwright, Cypress, API testing and more — scan in seconds, copy what you need.
Browse all sheetsConfigs20+
Framework config files ready to drop into your project.
BrowsePatterns20+
Proven test design patterns with worked examples.
BrowseTemplates10+
Test plans, bug reports, and process documents.
BrowseChecklists10
Feature-level test checklists for releases and reviews.
Browse// ai
AI for testing,
without the hype
Practical workflows for using AI in QA — test generation, synthetic data, traceability — each with honest tradeoffs and a prompt you can copy.
Explore 30+ AI guides →// learn
Start learning
All 30+ courses →Structured courses — from your first test case to production-grade automation frameworks.
Beginner
Software Testing Fundamentals
Everything you need to know to start a career in software testing. No coding required.
// 32 lessons
Intermediate
Cypress with TypeScript
The most comprehensive Cypress course for QA engineers. Start from zero and progress to advanced patterns — custom commands, API mocking, visual testing, CI/CD integration, and building a production-ready test framework. All examples in TypeScript.
// 42 lessons
Intermediate
Playwright with TypeScript
Master Playwright from installation to advanced patterns. Covers multi-browser testing, API testing, visual comparisons, fixtures, parallel execution, and building enterprise-grade test frameworks. The most comprehensive Playwright course for QA engineers. All in TypeScript.
// 42 lessons
Intermediate
API Testing Masterclass
Comprehensive course on API testing concepts, independent of any specific tool. Covers REST, GraphQL, authentication, contract testing, performance, and testing strategy. The theory course that underpins all API testing tool courses.
// 35 lessons
Intermediate
Performance Testing with K6
Master modern performance testing with K6 — the developer-friendly load testing tool. Write tests in JavaScript, integrate with CI/CD, and analyse results in Grafana. Covers load, stress, spike, and soak testing patterns.
// 29 lessons
Intermediate
Claude Code for QA
Use Claude Code as your AI pair-programmer for test automation. Learn to install, configure, and master Claude Code for writing tests, refactoring frameworks, debugging failures, and automating QA workflows from the terminal.
// 21 lessons
Beginner
Python for QA
Learn Python fundamentals through a QA lens. Python is widely used for API testing, scripting, and data processing in testing. This course teaches you the Python you need to write Playwright tests, API automation scripts, and testing utilities.
// 31 lessons
Advanced
Test Automation Frameworks
Learn how to design and build production-grade test automation frameworks. Covers framework architecture, design patterns (POM, Factory, Builder, Singleton), driver management, configuration, reporting, and how to choose between linear, modular, data-driven, keyword-driven, and hybrid frameworks.
// 27 lessons
// interview prep
Walk in ready
All 26 topics →Real questions by topic and seniority — each with a short answer, a model answer, and the pitfall to avoid.
Mid-level// cypress
Explain Cypress retry-ability in your own words.
Most Cypress commands and assertions automatically re-run for a few seconds until they pass or time out, so you rarely need explicit waits. Only the last query plus its trailing assertions retry; .then and .click fence it off.
// what interviewers look for
A mental model of the command queue, awareness that only the last query retries, and an explanation for why .then and .click break the retry. Bonus for knowing the default timeout is 4 seconds.
Test design, exploratory testing, bug reporting, test cases, regression strategy.
// 150+ questions
🗄️
SQL
SELECT, JOINs, GROUP BY, subqueries, validating DB state, finding duplicates/orphans.
// 70+ questions
How would you test X? Structured approaches to the open-ended design questions interviewers ask.
// 60+ questions
// practice
Practice on real QA work
All practice →Hands-on apps, project samples and assignments — practise scenarios, hunt seeded bugs and build real automation, not just read about it.
UI end-to-end frameworks — architecture, fixtures, CI/CD and reporting.
// Playwright · Cypress · Selenium
Automated API suites — CRUD, schema, auth and contract-style checks.
// REST Assured · Karate
Test case design, exploratory charters, bug reporting and test plans.
// Test cases · Exploratory · Bug reports
Hands-on API testing with Postman and Bruno — collections, assertions, scripting.
// Postman · Bruno
Consumer-driven contract testing, service virtualisation, integration patterns.
// Pact · Contract testing
// from the blog
Deep dives, opinions, comparisons & more
Read the blog →// Tutorials
Custom Cypress commands that actually pay off
Most teams over-abstract too early. Four custom commands are worth writing on every Cypress project — login, seed, intercept, visit. The rest can wait.
7 min read
// Comparisons
Scripted vs exploratory testing: when each earns its place
Not a loyalty test — a scheduling one. Scripted proves the behaviour you already know to check; exploratory finds what nobody specified. Here's which to reach for, when, and how to blend them in one cycle.
7 min read
// Comparisons
Manual vs automated testing: where the line actually falls
Not rivals fighting over the same budget — different jobs. Automation guards what you already know; manual testing judges what you don't. Draw the line wrong and you get a brittle suite and the important bugs still escaping.
6 min read
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// 200+ tools · 30+ AI guides · 260+ terms · all free
// Support
Keep qa.codes free.
qa.codes is a free, ad-free side project. A small tip helps keep it running and growing.
- Keeps every tool, sheet & guide free
- Funds new cheat sheets and roadmaps
- Sharpens the hands-on practice apps
- No account, no paywall — ever
- 100% optional, always appreciated
