Cat Facts — Free Random Cat Facts API (No Key Needed)

TL;DR

Cat Facts delivers a never-ending stream of verified cat facts at the tap of an endpoint. Each call returns a random fact about feline anatomy, behavior, history, or biology in clean JSON. It's absurdly simple — one endpoint, no params, no key — but perfect for adding a dash of whimsy to any app, homepage widget, or command-line tool.

Quick start: https://catfact.ninja/fact

No API key needed — just make a request!

How to Use This API

1. Get a Random Fact

https://catfact.ninja/fact

Returns: {"fact":"A cat's nose is as unique as a human's fingerprint.","length":56}

2. Get Multiple Facts

Use the limit parameter to batch them:

https://catfact.ninja/facts?limit=5

Returns up to 25 facts per page with pagination support.

3. JavaScript — Daily Cat Fact Widget

async function getCatFact() {
  const resp = await fetch('https://catfact.ninja/fact');
  const data = await resp.json();
  return data.fact;
}

getCatFact().then(fact => {
  console.log('🐱 Did you know?', fact);
});

// Display in an HTML element
getCatFact().then(fact => {
  document.getElementById('cat-fact').textContent = fact;
});

4. Python — CLI Cat Fact Tool

import requests
import json

def random_cat_fact():
    resp = requests.get('https://catfact.ninja/fact')
    return resp.json()['fact']

def batch_facts(count=5):
    resp = requests.get(
        'https://catfact.ninja/facts',
        params={'limit': count}
    )
    return [f['fact'] for f in resp.json()['data']]

# Print 3 random facts
for i, fact in enumerate(batch_facts(3), 1):
    print(f"Cat Fact #{i}: {fact}")

Try a random cat fact: https://catfact.ninja/fact

Try This URL Now

Frequently Asked Questions

How many cat facts are in the database?: The API has hundreds of curated cat facts covering topics from anatomy (cats have 32 muscles per ear) to history (ancient Egyptians shaved their eyebrows when cats died).
Can I get facts in other languages?: The API currently returns facts in English only. There is no language parameter available.
Does the API support pagination for multiple facts?: Yes. The /facts endpoint supports page and limit (max 25) parameters. Response includes current_page, last_page, and total fields.
Are the facts verified for accuracy?: Yes, the facts are researched and curated. You'll find scientifically accurate information sourced from veterinary journals and feline research.
Can I use this in a commercial app?: Yes. The API is free for any use, including commercial applications. No attribution required but always appreciated.
Are there non-cat facts available?: No, this API only returns cat facts. For dog facts, check out Dog CEO or Dog API. For general animal facts, try Amazing Endemic Species.

API Details

API URL: https://catfact.ninja/fact
Documentation: catfact.ninja
Category: Fun
Authentication: Not Required
Geographic Coverage: Global

What You Can Build

Browser extension that shows a cat fact on every new tab
Daily cat fact email or SMS subscription service
Discord/Slack bot that posts random cat facts on command
Widget for pet store websites to engage visitors
Desktop notification app that delivers a fact every hour