We all have that moment mid-project: "I just need a quick API to do X." Then you spend 45 minutes reading docs, comparing pricing tiers, and realizing the free plan only allows 10 requests per day.
Here are 5 APIs I actually use — all free or with generous free tiers — that solve real problems without the billing page anxiety.
1. JSONPlaceholder — Fake REST API for Prototyping
When you're building a frontend and need realistic data right now, JSONPlaceholder is the answer. No API key, no signup, no rate limits.
curl https://jsonplaceholder.typicode.com/posts/1
It provides /posts, /comments, /albums, /photos, /todos, and /users — enough to prototype any CRUD app. I use it every time I'm testing a new React component or debugging a fetch wrapper.
Free tier: Unlimited. No key needed.
Website: jsonplaceholder.typicode.com
2. OpenWeatherMap — Weather Data for Any Location
Need weather data in your app? OpenWeatherMap has been the go-to for years, and their free tier is still solid: 60 calls/minute, current weather + 5-day forecast.
I used this in a side project that calculated energy costs based on local temperature — paired with a fuel cost calculator for the financial side.
Free tier: 1,000 calls/day, current weather + forecast.
Website: openweathermap.org/api
3. CaptureAPI — Screenshots & PDF Generation
This one solves a problem I kept running into: generating screenshots or PDFs of web pages programmatically. Whether it's for social media previews, automated reports, or testing — you need a headless browser somewhere.
CaptureAPI handles it with a single endpoint:
curl "https://api.captureapi.dev/v1/screenshot?url=https://example.com&format=png" \
-H "Authorization: Bearer YOUR_API_KEY" \
-o screenshot.png
What I like about it:
- Fast — responses in 1-3 seconds for most pages
- Customizable — set viewport size, wait for selectors, inject CSS
- PDF support — actual PDF generation with page sizing
- No infrastructure — no Puppeteer/Playwright on your own server
Free tier: Generous free plan available.
Website: captureapi.dev
4. ExchangeRate-API — Currency Conversion
If your app handles money across borders, you need exchange rates. ExchangeRate-API provides daily-updated rates for 161 currencies with no authentication required on the free tier.
Simple, reliable, and the response is clean JSON. I integrated it into a currency converter tool and it's been running without issues for months.
Free tier: 1,500 requests/month, daily updates.
Website: exchangerate-api.com
5. Abstract IP Geolocation — Know Where Your Users Are
Sometimes you need to detect a user's country for localization, compliance, or just showing the right currency. Abstract's IP Geolocation API does this cleanly.
I use it to auto-detect the user's locale and pre-select the right language. It's also useful for showing location-specific content — like pointing Spanish users to the VAT calculator or selecting the right default currency.
Free tier: 20,000 requests/month.
Website: abstractapi.com/ip-geolocation-api
Tips for Working with Free APIs
1. Always cache responses. If exchange rates update daily, don't fetch them on every page load. A simple localStorage cache with a TTL saves you hundreds of requests.
2. Add error handling for rate limits. Free tiers hit limits. Handle 429 responses gracefully instead of showing a blank screen.
3. Have a fallback. APIs go down. If it's not critical, show a default value. If it is critical, queue the request and retry.
4. Use developer tools for the boring stuff. Don't build a JSON formatter from scratch when you need to debug an API response — use one that already exists. I keep ToolKit Online open in a tab for quick JSON formatting, Base64 encoding, and URL encoding while working with APIs.
Wrapping Up
The best API is the one that lets you ship faster. All five of these have saved me hours of infrastructure work — no servers to maintain, no billing surprises, no complex SDKs.
If you know a free API that deserves to be on this list, drop it in the comments. Always looking for new tools to add to the stack.
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