Free Tier: $5 credit Use Case: Text generation, chat, code completion Docs: https://platform.openai.com/docs

javascriptconst response = await fetch('https://api.openai.com/v1/chat/completions', { method: 'POST', headers: { 'Authorization': Bearer ${API_KEY}, 'Content-Type': 'application/json' }, body: JSON.stringify({ model: 'gpt-3.5-turbo', messages: [{ role: 'user', content: 'Hello!' }] }) });

Free Tier: $5 credit Use Case: Advanced reasoning, analysis, coding Docs: https://docs.anthropic.com

javascriptconst Anthropic = require('@anthropic-ai/sdk'); const client = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY });

const message = await client.messages.create({ model: 'claude-sonnet-4-20250514', max_tokens: 1024, messages: [{ role: 'user', content: 'Explain quantum computing' }] });

Free Tier: Unlimited (rate limited) Use Case: 100K+ pre-trained models Docs: https://huggingface.co/docs

pythonfrom transformers import pipeline

classifier = pipeline('sentiment-analysis') result = classifier('I love this API!') print(result) # [{'label': 'POSITIVE', 'score': 0.99}]

Unsplash

Free Tier: 50 requests/hour Use Case: High-quality free photos Docs: https://unsplash.com/documentation

javascriptconst response = await fetch( 'https://api.unsplash.com/photos/random?query=nature', { headers: { 'Authorization': Client-ID ${ACCESS_KEY} }} ); const photo = await response.json(); console.log(photo.urls.regular);

Free Tier: 50 images/month Use Case: Remove image backgrounds Docs: https://www.remove.bg/api

bashcurl -X POST https://api.remove.bg/v1.0/removebg
-H "X-Api-Key: YOUR_API_KEY"
-F "image_url=https://example.com/image.jpg"

Free Tier: 25GB storage, 25GB bandwidth Use Case: Image/video hosting & transformation Docs: https://cloudinary.com/documentation

javascriptcloudinary.uploader.upload('path/to/image.jpg', { transformation: [ { width: 500, height: 500, crop: 'fill' }, { effect: 'sepia' } ] });

Free Tier: Unlimited Use Case: Placeholder images Docs: https://picsum.photos

html

Free Tier: 10-30 calls/min Use Case: Crypto prices, market data Docs: https://www.coingecko.com/api/documentation

javascriptconst response = await fetch( 'https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum&vs_currencies=usd' ); const prices = await response.json(); // { bitcoin: { usd: 43250 }, ethereum: { usd: 2300 }}

Free Tier: 25 requests/day Use Case: Stock market data Docs: https://www.alphavantage.co/documentation

javascriptconst url = https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=AAPL&apikey=${API_KEY}; const data = await fetch(url).then(r => r.json());

Free Tier: Unlimited Use Case: Real-time crypto exchange rates Docs: https://docs.cloud.coinbase.com/exchange/docs

javascriptconst response = await fetch('https://api.coinbase.com/v2/exchange-rates?currency=BTC'); const rates = await response.json(); console.log(rates.data.rates.USD);

OpenWeatherMap

Free Tier: 1,000 calls/day Use Case: Weather data, forecasts Docs: https://openweathermap.org/api

javascriptconst response = await fetch( https://api.openweathermap.org/data/2.5/weather?q=London&appid=${API_KEY}&units=metric ); const weather = await response.json(); console.log(${weather.main.temp}°C, ${weather.weather[0].description});

Free Tier: 1,000 requests/month Use Case: Get location from IP address Docs: https://ipapi.co/api

javascriptconst response = await fetch('https://ipapi.co/json/'); const location = await response.json(); console.log(${location.city}, ${location.country_name});

Free Tier: Unlimited Use Case: Country information Docs: https://restcountries.com

javascriptconst response = await fetch('https://restcountries.com/v3.1/name/india'); const country = await response.json()[0]; console.log(country.capital[0]); // New Delhi

Twitter API v2

Free Tier: 500K tweets/month (read) Use Case: Search tweets, user data Docs: https://developer.twitter.com/en/docs/twitter-api

javascriptconst response = await fetch('https://api.twitter.com/2/tweets/search/recent?query=javascript', { headers: { 'Authorization': Bearer ${BEARER_TOKEN} } });

Free Tier: 60 requests/minute Use Case: Fetch posts, subreddit data Docs: https://www.reddit.com/dev/api

javascriptconst response = await fetch('https://www.reddit.com/r/programming/hot.json?limit=10'); const posts = await response.json();

SendGrid Free Tier: 100 emails/day Use Case: Transactional emails Docs: https://docs.sendgrid.com

javascriptconst sgMail = require('@sendgrid/mail'); sgMail.setApiKey(process.env.SENDGRID_API_KEY);

await sgMail.send({ to: '[email protected]', from: '[email protected]', subject: 'Hello', text: 'Welcome to our app!' });

Free Tier: $15 credit Use Case: SMS, voice calls Docs: https://www.twilio.com/docs

javascriptconst twilio = require('twilio'); const client = twilio(accountSid, authToken);

await client.messages.create({ body: 'Your verification code is 123456', from: '+1234567890', to: '+9876543210' });

Spotify

Free Tier: Rate limited Use Case: Music metadata, playlists Docs: https://developer.spotify.com/documentation/web-api

javascriptconst response = await fetch('https://api.spotify.com/v1/search?q=Beatles&type=artist', { headers: { 'Authorization': Bearer ${ACCESS_TOKEN} } });

Free Tier: 10,000 units/day Use Case: Video metadata, search Docs: https://developers.google.com/youtube/v3

javascriptconst response = await fetch( https://www.googleapis.com/youtube/v3/search?part=snippet&q=javascript&key=${API_KEY} );

Free Tier: 40 requests/10 seconds Use Case: Movie & TV show data Docs: https://developers.themoviedb.org/3

javascriptconst response = await fetch( https://api.themoviedb.org/3/search/movie?api_key=${API_KEY}&query=Inception );

News API

Free Tier: 100 requests/day Use Case: Headlines, article search Docs: https://newsapi.org/docs

javascriptconst response = await fetch( https://newsapi.org/v2/top-headlines?country=us&apiKey=${API_KEY} );

Dev.to

Free Tier: Unlimited Use Case: Programming articles Docs: https://developers.forem.com/api

javascriptconst response = await fetch('https://dev.to/api/articles?tag=javascript'); const articles = await response.json();

Auth0

Free Tier: 7,000 active users Use Case: User authentication Docs: https://auth0.com/docs

javascriptconst auth0 = new auth0.WebAuth({ domain: 'YOUR_DOMAIN.auth0.com', clientID: 'YOUR_CLIENT_ID' });

Free Tier: Unlimited authentication Use Case: Email, social login Docs: https://firebase.google.com/docs/auth

javascriptimport { getAuth, signInWithEmailAndPassword } from 'firebase/auth';

const auth = getAuth(); await signInWithEmailAndPassword(auth, email, password);

MongoDB Atlas

Free Tier: 512MB storage Use Case: NoSQL database Docs: https://docs.mongodb.com/atlas

javascriptconst { MongoClient } = require('mongodb');

const client = new MongoClient(process.env.MONGODB_URI); await client.connect(); const db = client.db('myapp');

Free Tier: 500MB database, 1GB storage Use Case: Postgres database + auth Docs: https://supabase.com/docs

javascriptconst { createClient } = require('@supabase/supabase-js');

const supabase = createClient(SUPABASE_URL, SUPABASE_KEY); const { data } = await supabase.from('todos').select('*');

Free Tier: 1GB storage, 50K reads/day Use Case: Real-time NoSQL database Docs: https://firebase.google.com/docs/firestore

javascriptimport { getFirestore, collection, addDoc } from 'firebase/firestore';

const db = getFirestore(); await addDoc(collection(db, 'posts'), { title: 'Hello World' });

Free Tier: 5,000 requests/hour (authenticated) Use Case: Repo data, issues, PRs Docs: https://docs.github.com/en/rest

javascriptconst response = await fetch('https://api.github.com/users/codiebyheaart/repos', { headers: { 'Authorization': token ${GITHUB_TOKEN} } });

JSONPlaceholder

Free Tier: Unlimited Use Case: Fake REST API for testing Docs: https://jsonplaceholder.typicode.com

javascriptconst response = await fetch('https://jsonplaceholder.typicode.com/posts/1'); const post = await response.json();

Weather App javascriptasync function getWeather() { const ipResponse = await fetch('https://ipapi.co/json/'); const location = await ipResponse.json();

const weatherResponse = await fetch( https://api.openweathermap.org/data/2.5/weather?lat=${location.latitude}&lon=${location.longitude}&appid=${API_KEY}&units=metric ); const weather = await weatherResponse.json();

console.log(Weather in ${location.city}: ${weather.main.temp}°C); }

javascriptasync function trackCrypto() { const response = await fetch( 'https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum&vs_currencies=usd&include_24hr_change=true' ); const data = await response.json();

console.log(BTC: $${data.bitcoin.usd} (${data.bitcoin.usd_24h_change.toFixed(2)}%)); }

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Last Updated: December 2025 | Total APIs: 40+