API Study Guide 2026

Everything you need to pass the API exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 API Exam Format at a Glance

Questions

60 min

Time Limit

70%

Passing Score

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📚 API Topics to Study (35)

Test · 9 cards Test · 9 cards API Mocking and Stubbing · 7 cards API Mocking and Stubbing · 7 cards API Mocking and Stubbing · 7 cards API Authentication and Security · 6 cards API Authentication and Security · 6 cards API Authentication and Security · 6 cards API Authentication & Security Testing · 6 cards API Authentication & Security Testing · 6 cards API Authentication & Security Testing · 6 cards API Documentation and Design · 6 cards API Documentation and Design · 6 cards API Documentation and Design · 6 cards API Documentation & Specification · 6 cards API Documentation & Specification · 6 cards API Documentation & Specification · 6 cards API Error Handling and Debugging · 6 cards API Error Handling and Debugging · 6 cards API Error Handling and Debugging · 6 cards API Performance Testing · 6 cards API Performance Testing · 6 cards API Performance Testing · 6 cards API Test Automation · 6 cards API Test Automation · 6 cards API Test Automation · 6 cards GraphQL & SOAP Testing · 6 cards GraphQL & SOAP Testing · 6 cards GraphQL & SOAP Testing · 6 cards REST API Fundamentals · 6 cards

See all 35 topics as flashcards →

✍️ Sample API Questions & Answers

1. What is the purpose of the 'record and replay' feature found in API mocking tools?

✓ Capturing real HTTP interactions with an actual API and replaying them as mock responses in subsequent tests

Record and replay captures live HTTP traffic from a real API and uses those recordings as mock responses, ensuring that mock data is realistic and matches actual API behavior.

2. Which HTTP header is used to send a Bearer token in API requests?

✓ Authorization

Bearer tokens are sent in the Authorization header using the format 'Authorization: Bearer '.

3. What is a GraphQL 'schema' used for?

✓ Describing all available types, queries, mutations, and subscriptions in the API

The GraphQL schema is the contract that defines every type, field, query, mutation, and subscription the API exposes.

4. Which HTTP status code means 'No Content' after a successful DELETE?

✓ 204

204 No Content is commonly returned after a successful DELETE when there is no body to return.

5. What does the Apdex score measure in API performance monitoring?

✓ User satisfaction based on response time thresholds

Apdex (Application Performance Index) is a standardized score from 0–1 measuring user satisfaction by bucketing response times into Satisfied, Tolerating, and Frustrated.

6. Which Python library is commonly used for writing automated REST API tests?

✓ Requests + PyTest

The `requests` library handles HTTP calls while `pytest` provides the test framework, making them the standard Python combo for API test automation.

🎯 Free API Practice Tests

Test · 9 questions Test · 9 questions API Mocking and Stubbing · 7 questions API Mocking and Stubbing · 7 questions API Mocking and Stubbing · 7 questions REST API Fundamentals · 6 questions API Authentication and Security · 6 questions API Documentation and Design · 6 questions API Test Automation · 6 questions API Performance Testing · 6 questions

📖 API Guides & Articles

Your API Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 API Flashcards (219)🏆 API Exam Simulation

What Practice Test Geeks adds beyond an AI chat for API

An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:

A timed, full-length API mock exam — 50 questions in 60 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
A fixed API question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
A printable API cheat sheet you can print or save as a PDF.
API flashcards built from the same question bank.
Free API practice tests with the correct answer shown after each question.

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