Open Trivia DB

How to Use This API

1. Get 10 Random Questions

https://opentdb.com/api.php?amount=10

Returns 10 questions with category, difficulty, type (multiple/boolean), question text (HTML-encoded), correct_answer, and incorrect_answers array.

2. Filter by Category & Difficulty

https://opentdb.com/api.php?amount=5&category=18&difficulty=hard

Category 18 is Science: Computers. Combined with difficulty=hard for challenging programming questions.

3. True/False Only

https://opentdb.com/api.php?amount=5&type=boolean

Filter to true/false questions only. type=multiple for standard 4-choice questions.

4. Get Category List

https://opentdb.com/api_category.php

Returns all categories with their IDs. Use the ID in category parameter.

5. JavaScript — Quiz Game Engine

async function getQuestions(amount = 10, category = null) {
  const params = new URLSearchParams({ amount });
  if (category) params.set('category', category);
  params.set('encode', 'base64'); // avoid HTML encoding issues
  
  const resp = await fetch('https://opentdb.com/api.php?' + params);
  const data = await resp.json();
  
  return data.results.map(q => ({
    category: atob(q.category),
    difficulty: q.difficulty,
    question: atob(q.question),
    correct: atob(q.correct_answer),
    options: shuffle([
      ...q.incorrect_answers.map(a => atob(a)),
      atob(q.correct_answer)
    ])
  }));
}

function shuffle(arr) {
  for (let i = arr.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
  }
  return arr;
}

getQuestions(5, 18).then(questions => {
  questions.forEach((q, i) => {
    console.log(`${i+1}. [${q.difficulty}] ${q.question}`);
    console.log('   Answers:', q.options.join(', '));
  });
});

6. Python — Category Quiz

import requests
import html

categories = {
    'General Knowledge': 9,
    'Science & Nature': 17,
    'Science: Computers': 18,
    'Mythology': 20,
    'Sports': 21,
    'Geography': 22,
    'History': 23,
    'Animals': 27
}

def get_quiz(category_name, count=5):
    cat_id = categories.get(category_name, 9)
    resp = requests.get('https://opentdb.com/api.php', params={
        'amount': count,
        'category': cat_id
    })
    data = resp.json()
    
    for i, q in enumerate(data['results'], 1):
        question = html.unescape(q['question'])
        correct = html.unescape(q['correct_answer'])
        print(f"\n{i}. {question}")
        print(f"   Answer: {correct}")

get_quiz('Science: Computers', 3)