M
API Matrix

Cats API

⭐ Beginner's Pick Animals / API Key Intermediate HTTPS
Varies by plan (check documentation)
74 Score
Grade B
Visit Official Site Compare Alternatives

Overview

The Cat API provides random cat images, breed data, and voting features. Beginners use it to learn image APIs and optional API key usage, since it works with or without a key.

💡

Beginner Tip

Works without a key but limited to 10 req/hour. Register free at developers.thecatapi.com to raise the limit to 10 req/second.

Available Data

cat image URLs
breed information
cat-specific data
Use case: Integrate pictures of cats from tumblr data into web and mobile applications

Example Response

JSON Response 
{
  "image_url": "https://api.example.com/cats/random.jpg",
  "status": "success"
}

Field Reference

id Unique identifier for the cat image
url Direct URL to the cat image (jpg or gif)
width Width of the image in pixels
height Height of the image in pixels
breeds Array of breed objects with name, description, and traits if the image is breed-tagged

Implementation Example 

const url = "https://docs.thecatapi.com/";
// 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

429 Too Many Requests Exceeded unauthenticated rate limit of 10 requests per hour
✓ Register for a free API key and pass it as header x-api-key
Empty array response No images match the breed_id filter you provided
✓ Check valid breed IDs at /v1/breeds first before filtering
Image URL returns 404 CDN-cached image was deleted from upstream
✓ Request a new random image rather than caching the URL long-term

Matrix Score Breakdown

🌐 Reachability 30/30
⚡ Speed 10/20
🔒 Security 15/15
🛠 Developer XP 9/20
✓ Reliability 10/15

Partially tested on Apr 5, 2026

Technical Specifications

Auth API Key
HTTPS REQUIRED
CORS NO
Category Animals
Difficulty Intermediate
Verified: 2026-04-07

Recipes Using Cats

Build something with this API. Each recipe includes step-by-step instructions and code outlines.

Beginner 1-2 hours

Build a Daily Pet Photo Notifier

3 APIs
Beginner 1-2 hours

Build a Pet Breed Comparison Tool

2 APIs

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