Overview

QuizAPI.io provides a large collection of programming and technology quiz questions with multiple-choice answers, making it perfect for building coding quizzes and learning apps. You need a free API key to access questions. Questions can be filtered by category, difficulty, tags, and programming language.

Beginner Tip

Sign up for a free API key at quizapi.io and include it as a query parameter (apiKey=YOUR_API_KEY). Use the category and difficulty parameters to get questions suited to your use case, like category=Linux&difficulty=Easy.

Available Data

The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.

quizapi.io data via REST API

Example Response

Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.

JSON Response · Illustrative
{
  "id": 1,
  "name": "quiz.io",
  "data": "Access to various kind of quiz questions",
  "source": "quizapi.io"
}

Field Reference

id Unique identifier for the quiz question
question The quiz question text to display to the user
answers Object with keys answer_a through answer_f containing possible answer choices (some may be null)
correct_answers Object with boolean string values indicating which answers are correct (e.g., answer_a_correct: "true")
difficulty Difficulty level of the question: Easy, Medium, or Hard
category Topic category of the question such as Linux, DevOps, or Docker

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

Request
const url = "https://quizapi.io/api/v1/questions?apiKey=YOUR_API_KEY&limit=5&category=Linux&difficulty=Easy";
// Replace headers or query params with the values required by this API.
const response = await fetch(url, {
  headers: {
  "X-API-Key": "YOUR_API_KEY"
  }
});
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.

401 Unauthorized API key is missing or invalid in the request
Include your API key as a query parameter: ?apiKey=YOUR_API_KEY — get a free key by registering at quizapi.io
Empty questions array No questions exist for the specified category and difficulty combination
Try removing one of the filters (category or difficulty) to broaden the search, or check the supported categories listed in the docs
429 Too Many Requests Exceeded your plan's daily request limit
Free accounts have a limited quota; add caching to your app to store questions locally and reduce API calls

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS YES
Category Games & Comics
Difficulty Intermediate
Listing details not endpoint-verified

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