Tutorial
How to Test a REST API for Free — Complete Beginner's Guide
Learn what REST APIs are, HTTP methods, status codes, and how to make your first free API call.
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Beginner Guide
15 Best Free APIs That Require No API Key in 2025 — Test Instantly
A hand-picked list of the best free public APIs you can call directly from your browser right now — no registration, no credit card, no rate-limit anxiety. Every API on this list is completely free to use, returns clean JSON, and works great for practice projects and prototyping.
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Explainer
Free Mock API vs Real API — What's the Difference?
When to use a free fake API for testing and prototyping versus a live production API endpoint.
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Project Tutorial
Build a Weather App Using Only Free Public APIs
Step-by-step: build a real weather dashboard with Open-Meteo and JavaScript. Full source code included.
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Practice Guide
Top 10 Free APIs for Practice Projects That Will Impress
The best free API endpoints to use in portfolio projects. Impress employers with real-world integrations.
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Reference
50+ Free APIs You Can Test Without an API Key Right Now
A comprehensive list of totally open free API endpoints for immediate testing — organized by category.
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Tool Guide
How to Use Postman with Free APIs — Complete Setup Guide
Set up Postman for free API testing, organize collections, use environments, and automate tests.
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JavaScript
JavaScript Fetch API Tutorial — Call Free APIs with No Setup
Master the JavaScript Fetch API using real free endpoints. Async/await, error handling, and JSON parsing.
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Finance APIs
Best Free Crypto APIs for Testing — CoinGecko & More
Build a real-time crypto price tracker using free cryptocurrency APIs that don't require an account.