Top 10 Free APIs Every Developer Needs to Know About
Let’s be real: building apps from scratch is hard. But you don’t have to reinvent the wheel every time. Free APIs can save you weeks of work — whether you’re prototyping, building a side project, or just learning. These are the ones I’ve actually used in real projects, and they’ve saved me time, money, and headaches.
Here are 10 free APIs that every developer should have in their back pocket.
1. JSONPlaceholder – Fake REST API for Testing
Need a quick backend for testing your frontend? JSONPlaceholder is your go-to.
It gives you a full fake REST API with posts, users, comments, and more — no setup, no auth, just instant data.
fetch('https://jsonplaceholder.typicode.com/posts/1')
.then(response => response.json())
.then(post => console.log(post.title));
Use it for:
- Testing Axios or Fetch calls
- Mocking API responses
- Learning React, Vue, etc.
No rate limits, no keys. Just works.
2. IPify – Get Public IP Address
Sometimes you just need to know what your public IP is — like in a CLI tool or a debug panel.
IPify is lightweight, fast, and returns JSON.
fetch('https://api.ipify.org?format=json')
.then(res => res.json())
.then(data => console.log(data.ip));
Bonus: They have SDKs for Go, Python, Node.js, and more. Great for logging or geolocation prep.
3. OpenWeatherMap – Weather Data
Weather APIs are everywhere, but OpenWeatherMap is the most reliable free tier.
You get current weather, forecasts, and even UV index — all with a free API key (just sign up).
const API_KEY = 'your-key';
fetch(`https://api.openweathermap.org/data/2.5/weather?q=London&appid=${API_KEY}`)
.then(res => res.json())
.then(data => console.log(data.main.temp));
Pro tip: Use units=metric or units=imperial to avoid Kelvin surprises.
4. The Cat API – Because Cats
Okay, this one’s fun — but also surprisingly useful.
Need placeholder images? The Cat API returns random cat photos with breeds, categories, and even GIFs.
fetch('https://api.thecatapi.com/v1/images/search?limit=1')
.then(res => res.json())
.then(data => {
document.getElementById('cat').src = data[0].url;
});
Free tier: 100 requests/day. Perfect for side projects or testing image loading.
5. PokeAPI – Pokémon Data
Full database of Pokémon, moves, types, abilities — all free and well-documented.
No API key needed.
fetch('https://pokeapi.co/api/v2/pokemon/pikachu')
.then(res => res.json())
.then(data => {
console.log(data.types.map(t => t.type.name)); // ['electric']
});
Used it in a game, a quiz app, and even a team onboarding tool (don’t ask). Solid, consistent, and fun.
6. REST Countries – Country Data
Need country names, capitals, currencies, or timezones? REST Countries has it.
fetch('https://restcountries.com/v3.1/name/france')
.then(res => res.json())
.then(data => {
console.log(data[0].capital); // ['Paris']
console.log(data[0].currencies.EUR.name); // Euro
});
No auth, no rate limits (as of 2024), and supports filtering by region, language, etc.
Perfect for forms, dashboards, or localization.
7. Unsplash Source – Free High-Res Images
Unsplash’s official API lets you pull high-quality photos.
Free tier: 50 requests/hour, requires registration and app approval (takes 1–2 days).
// Use your access key
fetch('https://api.unsplash.com/photos/random?client_id=YOUR_KEY&query=nature')
.then(res => res.json())
.then(data => {
document.body.style.backgroundImage = `url(${data.urls.regular})`;
});
Use it for:
- Background images
- Blog thumbnails
- Design inspiration
Just don’t hotlink in production without caching.
8. GitHub REST API – Public Data
You don’t need a key for public data — but one helps with rate limits.
Want to pull your own repo list, user info, or trending projects?
fetch('https://api.github.com/users/octocat')
.then(res => res.json())
.then(data => console.log(data.public_repos));
Combine with GitHub Actions or build a portfolio site that auto-updates.
9. JokeAPI – Random Jokes
Need humor in your app? JokeAPI delivers (pun intended).
Supports programming jokes, dark humor, and even multilingual jokes.
javascript
fetch('https://v2.jokeapi.dev/joke/Programming')
.then(res => res.json())
.then(data => {
if (data.type === 'single') {
console.log(data.joke);
} else {
console.log(`${data.setup} ... ${data.delivery}`);
}
});
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