DEV Community: Canpolat Kaya

Stop Using Placeholder JSON: 12 Real Free APIs for Your Next Side Project (With Live Sandboxes)

Canpolat Kaya — Tue, 03 Nov 2026 15:54:22 +0000

Whenever we start a new frontend project, portfolio piece, or hackathon prototype, we usually default to the same old jsonplaceholder.typicode.com or hardcoded dummy objects.

While that works for a quick proof of concept, mock data gets boring fast. Building something that feels like a real production app needs real-world data: dynamic movie posters, live weather, currency conversions, game stats, and high-res photography.

Finding truly free public APIs that don't require a credit card upfront or a nightmare OAuth flow is surprisingly frustrating.

To save you hours of hunting through abandoned GitHub READMEs, here is a curated list of 12 genuinely free, developer-friendly REST APIs you can integrate in under 5 minutes. Every single one includes a direct link to test it live in an interactive sandbox.

1. TMDB (The Movie Database) — For Netflix / Letterboxd Clones

Best for: Movie/TV streaming UI, search with autocomplete, trending media.
Auth: Free API Key (instant signup, no credit card).
Why it rocks: TMDB provides millions of high-resolution posters, backdrop art, cast lists, trailers, and user ratings. If you're building a media dashboard, this is the gold standard.

// Fetch trending movies of the week
const res = await fetch('https://api.themoviedb.org/3/trending/movie/week?api_key=YOUR_KEY');
const { results } = await res.json();
console.log(results[0].title, results[0].backdrop_path);

👉 Test TMDB in the Live Interactive Sandbox

2. Pexels API — For Unsplash-Style Image & Video Galleries

Best for: Infinite scroll photo grids, wallpaper apps, stock video pickers.
Auth: Free API Key (generous rate limit: 200 requests/hour, 20,000/month).
Why it rocks: Clean metadata, responsive image sizing URLs (original, large2x, tiny), and video search support.

const res = await fetch('https://api.pexels.com/v1/search?query=developer&per_page=5', {
  headers: { Authorization: 'YOUR_PEXELS_KEY' }
});
const data = await res.json();
console.log(data.photos.map(p => p.src.medium));

👉 Test Pexels in the Live Interactive Sandbox

3. Open-Meteo — Clean Weather Forecast (Zero Key Required)

Best for: Weather widgets, geo-based dashboards.
Auth: No API Key required at all (Zero Auth).
Why it rocks: Completely open-source, non-commercial and commercial free tiers, zero registration. Just pass latitude and longitude.

// Get hourly temperature in Istanbul/London
const res = await fetch('https://api.open-meteo.com/v1/forecast?latitude=41.0082&longitude=28.9784&current_weather=true');
const data = await res.json();
console.log(`Current Temp: ${data.current_weather.temperature}°C`);

👉 Test Open-Meteo in the Live Interactive Sandbox

4. CoinGecko API — Crypto & Market Analytics

Best for: Crypto price trackers, portfolio visualizers, candlestick charts.
Auth: Free tier without credit card.
Why it rocks: Tracks 10,000+ coins, historical market caps, 24h trading volume, and decentralized exchange pairs.

// Simple price check for Bitcoin & Ethereum
const res = await fetch('https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum&vs_currencies=usd');
const prices = await res.json();
console.log(prices.bitcoin.usd);

👉 Test CoinGecko in the Live Interactive Sandbox

5. Openverse — 800M+ CC-Licensed Media Assets

Best for: Open-source audio/image search engines, meme generators.
Auth: Free Key (supports anonymous burst requests).
Why it rocks: Powered by WordPress Foundation, indexing Creative Commons licensed audio, photos, and public domain art.

👉 Test Openverse in the Live Interactive Sandbox

6. Frankfurter — Currency & Forex Rates (Zero Key Required)

Best for: E-commerce currency switchers, financial calculators.
Auth: No API Key required.
Why it rocks: Uses European Central Bank reference rates updated daily. Lightweight, reliable, and zero CORS headaches.

// Convert 100 USD to EUR & GBP
const res = await fetch('https://api.frankfurter.dev/v1/latest?amount=100&from=USD&to=EUR,GBP');
const data = await res.json();
console.log(data.rates);

👉 Test Frankfurter in the Live Interactive Sandbox

7. REST Countries — Detailed Geopolitical Data

Best for: Country selector dropdowns, geography quizzes, flag icons.
Auth: No API Key required.
Why it rocks: Currencies, calling codes, borders, population, capital cities, and SVG flags in one clean payload.

const res = await fetch('https://restcountries.com/v3.1/name/japan');
const [japan] = await res.json();
console.log(japan.capital[0], japan.population, japan.flags.svg);

👉 Test REST Countries in the Live Interactive Sandbox

8. Steam Web API — Gaming & Esports Stats

Best for: Gamer profile showcases, game inventory viewers, Steam sale trackers.
Auth: Free Steam API key via your Steam account.
Why it rocks: Real-time player counts, achievement progression, and community market trends.

👉 Test Steam API in the Live Interactive Sandbox

9. IP-API — Free Geolocation & ASN Lookup

Best for: Automatic timezone detection, user country localization, fraud checks.
Auth: Free endpoint without API key (up to 45 req/min).
Why it rocks: Returns country code, city, ISP, and coordinates instantaneously without requiring the user to accept browser GPS prompts.

const res = await fetch('http://ip-api.com/json/');
const location = await res.json();
console.log(`User is connecting from ${location.city}, ${location.country}`);

👉 Test IP-API in the Live Interactive Sandbox

10. PokeAPI — The Classic Frontend Playground

Best for: Beginners learning React/Vue state management, infinite scroll, filtering.
Auth: No API Key required.
Why it rocks: Intricate relational data (moves, abilities, evolutionary chains, sprite sheets) that pushes you to write robust frontend mapping.

👉 Test PokeAPI in the Live Interactive Sandbox

11. NASA Open APIs — Astronomy Picture of the Day & Mars Rovers

Best for: Space dashboards, daily background changers, science blogs.
Auth: DEMO_KEY available out-of-the-box or instant personal key.
Why it rocks: Access actual imagery from Mars Curiosity/Perseverance, APOD photos with scientific explanations, and asteroid close-approach trackers.

👉 Test NASA API in the Live Interactive Sandbox

12. Hugging Face Inference API — Free Serverless AI Models

Best for: Sentiment analysis, text summarization, image classification.
Auth: Free Hugging Face user token.
Why it rocks: Tap into thousands of open-source models (Llama, Mistral, BERT, Stable Diffusion) without needing an expensive GPU instance.

👉 Test Hugging Face in the Live Interactive Sandbox

Bonus: How to Test & Filter 1,000+ More Free APIs

Tired of reading dead API documentation or signing up just to find out a service is behind a paywall?

I recently launched FindFreeAPI.com — an open, curated directory of over 1,000+ verified free public APIs across 47 categories.

Features built specifically for developers:

⚡ Interactive In-Browser Sandbox: Test cURL and Fetch requests directly on the site before writing a line of code.
🔑 Zero-Auth Filter: Instantly filter for APIs that require no API key or registration.
🌐 CORS-Ready Tags: Never hit a surprise Access-Control-Allow-Origin block again.
🛠️ Free Developer Utilities: Built-in JSON-to-TypeScript generators, regex testers, and webhook inspectors.

Bookmark it for your next hackathon or client project: 👉 FindFreeAPI.com

What are your favorite free APIs?

What API did you use for your latest side project that saved you time? Drop it in the comments below!

No API Key Doesn’t Mean Free for Commercial Use

Canpolat Kaya — Thu, 29 Oct 2026 16:30:29 +0000

“No API key required” sounds like an easy green light. It only answers one question: how a client authenticates. It does not tell you whether your app can use the service commercially, what the quota is, or whether the data needs attribution.

Here is a quick checklist using Open-Meteo’s public weather API as a concrete example.

1. Check the permitted use

Open-Meteo’s free API is for non-commercial use. Its terms classify apps that show ads or charge subscriptions as commercial use. That distinction matters even if the endpoint is public and the request succeeds.

Before building around any API, look for the provider’s definition of commercial use. “Free to call” and “free for my product” are not interchangeable.

2. Read the limits, not just the word “free”

Open-Meteo currently lists free-tier limits of fewer than 10,000 calls per day, 5,000 per hour, and 600 per minute. Limits can be applied by IP and application, so many users behind one serverless egress address may hit a shared limit earlier than expected.

A basic call counter is not enough if a page triggers a request on every render. Cache responses, avoid duplicate fetches, and handle HTTP errors explicitly.

const response = await fetch(url);

if (!response.ok) {
  throw new Error(`Weather API returned HTTP ${response.status}`);
}

const data = await response.json();

3. Look for attribution requirements

Open-Meteo’s weather data is licensed under CC BY 4.0. The provider says attribution is required, including when data is reused or redistributed. Plan where that credit will appear in your interface before launch.

4. Recheck before shipping

Terms, quotas, and pricing can change. Revisit the provider’s official docs before launch and when usage grows. If your app is commercial, check the provider’s commercial plan rather than assuming a no-key endpoint covers it.

Quick API review

Before integrating a public API, answer these four questions:

Is my use case allowed?
What are the per-minute, hourly, and daily limits?
Are limits shared by IP, key, or account?
Is attribution required, and where will it appear?

That five-minute check can prevent a working prototype from becoming a production problem.

Sources: Open-Meteo terms · Open-Meteo pricing and API limits

Disclosure: This post was generated with AI assistance and checked against the linked provider sources.

Build a Small Weather App with a Free API (No API Key Required)

Canpolat Kaya — Thu, 29 Oct 2026 16:22:44 +0000

A public API is useful only when you can get from “I found it” to a working request quickly. Here is a tiny example using Open-Meteo, a free weather API that does not require an API key for non-commercial use.

1. Make the request

Open-Meteo accepts latitude and longitude. This example fetches current temperature and wind speed for Istanbul:

const url = new URL("https://api.open-meteo.com/v1/forecast");
url.search = new URLSearchParams({
  latitude: "41.0082",
  longitude: "28.9784",
  current: "temperature_2m,wind_speed_10m",
  timezone: "Europe/Istanbul",
});

const response = await fetch(url);
if (!response.ok) throw new Error(`Weather request failed: ${response.status}`);
const weather = await response.json();
console.log(weather.current);

The response includes the requested measurements and a timestamp. Show units and the timestamp in your UI; a number like 18.4 is ambiguous by itself.

2. Keep failure states visible

A request that worked once can still fail in your app. Keep loading, error, and success states distinct, and set a timeout for production use.

Also check the provider's current usage terms. “No API key” does not mean unlimited or unrestricted commercial use.

3. Explore before wiring up a project

I maintain FreeAPI, a directory and live workbench for discovering public REST APIs. The Open-Meteo page lets you inspect and try the endpoint; the Explorer filters APIs by authentication and other details.

A catalog is useful when it helps you check fit before building around a provider. The provider's own docs remain the source of truth for terms and limits.

Disclosure: FreeAPI is my project. This post was prepared with AI assistance.

30+ Free REST APIs You Can Call Without an API Key in 2026 (No Credit Card, Zero-Auth)

Canpolat Kaya — Sun, 11 Oct 2026 12:22:47 +0000

Every developer has been there: you get inspired to build a weekend project, a portfolio app, or test out a new frontend framework like Next.js 15, React, or Vue.

You search for free public APIs, find a promising service, click the link, and immediately hit problems:

Mandatory account creation and email verification.
A free trial that requires a credit card upfront.
Obscure token headers or complicated OAuth flows before you can even see a sample JSON payload.
CORS errors crashing your localhost prototype.

To solve this friction, I put together a tested list of completely free, zero-authentication (Zero-Auth) REST APIs. You do not need an API key, an account, or a payment method. You can copy-paste the URL into your terminal with curl or fetch it directly in your browser console to get instant JSON data right now.

Weather and Geocoding APIs

Open-Meteo
Open-Meteo is by far the cleanest open-source weather API available. It provides high-resolution hourly weather forecasts, historical data, and marine forecasts with zero API key required for non-commercial use.

Endpoint: https://api.open-meteo.com/v1/forecast?latitude=52.52&longitude=13.41&current_weather=true
Rate Limit: 10,000 requests per day
CORS: Enabled
FreeAPI Link: https://findfreeapi.com/en/service/open-meteo

REST Countries
The ultimate dataset for country information: flags, currencies, languages, borders, population, and capital cities. Perfect for dropdown menus, country quizzes, and travel dashboards.

Endpoint: https://restcountries.com/v3.1/all
Rate Limit: Unlimited fair-use
CORS: Enabled
FreeAPI Link: https://findfreeapi.com/en/service/rest-countries

IP-API (ipapico)
Need to detect user location, timezone, or ISP without third-party SDKs? IP-API returns instant JSON geolocation data based on the caller's IP address.

Endpoint: https://ipapi.co/json/
Rate Limit: 1,000 requests per day
FreeAPI Link: https://findfreeapi.com/en/service/ipapico

Finance, Currency and Cryptocurrency

CoinPaprika
Unlike CoinMarketCap or CoinGecko which require developer signups and restricted API keys, CoinPaprika allows direct, keyless queries for live cryptocurrency prices, volume, and market tickers.

Endpoint: https://api.coinpaprika.com/v1/tickers
Rate Limit: Fair use (no rate wall)
FreeAPI Link: https://findfreeapi.com/en/service/coinpaprika

Frankfurter Exchange Rates
An open-source, keyless API tracking reference exchange rates published by the European Central Bank. Includes currency conversions and historical time-series data.

Endpoint: https://api.frankfurter.app/latest?from=USD&to=EUR
FreeAPI Link: https://findfreeapi.com/en/service/frankfurter

Entertainment, Gaming and Fun

PokeAPI
The gold standard for educational and portfolio apps. Highly detailed REST endpoints covering Pokemon stats, sprites, moves, and abilities.

Endpoint: https://pokeapi.co/api/v2/pokemon/ditto
Rate Limit: 100 requests per minute per IP
FreeAPI Link: https://findfreeapi.com/en/service/pokeapi

Open Trivia Database
A completely public database of multiple-choice trivia questions across science, history, video games, and pop culture. Ideal for building a live quiz game.

Endpoint: https://opentdb.com/api.php?amount=10
FreeAPI Link: https://findfreeapi.com/en/service/open-trivia-database

Cat Facts and Dog CEO
Lightweight endpoints delivering random facts and high-resolution animal pictures. Perfect for testing component image layouts or loading states.

Endpoint: https://dog.ceo/api/breeds/image/random
FreeAPI Link: https://findfreeapi.com/en/service/dog-ceo

AI and Generative Media

Pollinations AI
Generate images on the fly via URL prompts without registering for OpenAI or Midjourney.

Format: https://image.pollinations.ai/prompt/cyberpunk_neon_city_4k
Simply put that URL inside an image tag and it renders a generated image on demand.
FreeAPI Link: https://findfreeapi.com/en/service/pollinations-ai

Public Knowledge and Data

Nobel Prize API
Official linked data for all Nobel Prizes and Laureates since 1901. Includes affiliations, birthplaces, and citations.

Endpoint: https://api.nobelprize.org/2.1/laureates
FreeAPI Link: https://findfreeapi.com/en/service/nobel-laureates

World Universities API
A searchable directory of worldwide universities, domains, and country codes.

Endpoint: http://universities.hipolabs.com/search?country=United+States
FreeAPI Link: https://findfreeapi.com/en/service/world-universities

How to Bypass Localhost CORS Errors

When building frontend applications with React, Vue, or Next.js Client Components, calling external third-party endpoints often triggers browser CORS errors:
"Access to fetch has been blocked by CORS policy: No Access-Control-Allow-Origin header is present on the requested resource."

If an upstream public API has not enabled CORS headers for browser fetch, you do not need to build a custom backend just to test it. You can route your test request through the FreeAPI Edge CORS Gateway:

Simply prepend the gateway URL:
https://findfreeapi.com/api/v1/gateway?url=YOUR_ENCODED_ENDPOINT
It acts as a zero-latency edge reverse proxy that automatically attaches the required Access-Control-Allow-Origin header for your frontend prototyping.
Need More APIs? (Explore 500+ Verified Free APIs)

If you are looking for specific domains like Movie Databases (TMDB), Spotify alternatives, Sports scores, or AI LLMs, check out FreeAPI Directory:
https://findfreeapi.com/en

It is an open platform curating:

526+ actively verified free REST APIs across 47 categories.
Zero-Auth Filters: Instantly isolate APIs with no key requirements.
Live Sandbox: Ready-to-copy cURL, JavaScript, Node.js, and Python code.
17 In-Browser Dev Tools: Privacy-first PDF merger, compressor, WebP optimizer, UUID v7 generator, and SSL checker running 100% client-side via WebAssembly (zero server uploads): https://findfreeapi.com/en/tools
AI-Ready index (llms.txt): Machine-readable directory index for Cursor, Claude, and Perplexity users: https://findfreeapi.com/llms-full.txt

What is your favorite free API that you use for weekend hackathons or portfolio projects? Let me know in the comments!