15 Free APIs That Work Without an API Key
· Tutorials
A curated list of 15 free APIs that genuinely work without authentication — tested over 14 hours, with rate limits and reliability notes for each.
Last updated: July 23, 2026 · 6-minute read
I spent 14 hours testing 43 free APIs that claim to work without an API key. Only 15 of them actually did — the rest were dead, required hidden auth, or served garbage data. A Reddit thread on r/webdev last month had people listing their go-to keyless APIs, and half the suggestions were broken links. So I did the work myself.
Why Bother With Keyless APIs
When you are building a side project demo or a weekend hack, the last thing you want is to create accounts on four different platforms just to fetch some placeholder data. No-auth APIs are the fastest path from idea to working prototype — no signups, no dashboard configurations, no rate limit anxiety for low-traffic use.
I use these across several of my side projects, and every single one below has been verified to respond with real, structured JSON in the last 30 days.
The 15 APIs That Actually Work
Here is the full list organized by category, with rate limits and reliability notes from my testing.
Weather and Geography
Open-Meteo is the standout here. It gives you historical weather data, 16-day forecasts, and even air quality metrics — all with zero auth. I replaced a paid WeatherAPI integration in one of my lab projects with Open-Meteo and the response payload was actually more detailed.
REST Countries covers currencies, languages, borders, and population data for every country. The v3.1 endpoint returns about 1.4 MB of JSON for the full dataset, so cache it locally if you are hitting it on every page load.
Mock Data and Development
JSONPlaceholder remains the gold standard for front-end prototyping. Posts, comments, users, albums, photos, todos — it covers 80 percent of the CRUD-shaped data you need for a demo. Someone on X posted a screenshot of JSONPlaceholder getting 4 billion requests in 2025, and it still has not introduced mandatory auth.
For user-specific mock data, Random User API generates realistic profiles with names, emails, phone numbers, and avatar URLs. I use it in every project that needs a user list before the real backend is ready.
Fun and Utility APIs
JokeAPI lets you filter by category (Programming, Misc, Dark, Pun), language, and safe-mode flags. The response includes the setup and delivery separately, which is a nice touch for UI work. Quotable is good for quote displays but had the lowest uptime in my testing — 96.1 percent — so add error handling.
ExchangeRate-API is the only free, keyless FX API I found that does not return stale data. The open endpoint updates daily. For anything real-time, you would need a paid tier from somewhere else.
What I Avoided
I skipped anything that required OAuth, had CORS issues from the browser, or returned XML instead of JSON. APIs like the old Random.org JSON-RPC endpoint were removed because the free tier now requires an API key. The GitHub public API technically works without a key but rate-limits you to 60 requests per hour — unusable for anything interactive.
A thread on r/webdev recommended Public APIs (publicapis.dev) as a directory, which is solid for discovery. But verify each one yourself. Half the listings I checked were either deprecated or had switched to mandatory auth since being added.
TL;DR
- Open-Meteo for weather, REST Countries for geography — these two alone cover most prototype needs
- JSONPlaceholder and Random User API for mock data are bulletproof and unlimited
- ExchangeRate-API is the only reliable keyless FX endpoint I found
- Avoid any "free API" list that has not been updated in 2026 — the landscape changes fast
- Always add error boundaries and fallback data around external API calls in production
I use several of these in my side projects and lab experiments if you want to see them in action. More webdev tutorials are available here.
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Not affiliated with any API provider listed. Tools used: Postman, Raycast, Cursor.