Free API Tutorials & Guides

Step-by-step tutorials, project walkthroughs, and reference guides for using free public APIs in your projects. Written for beginners and experienced developers alike.

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Tutorial
How to Test a REST API for Free โ€” 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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Explainer
Free Mock API vs Real API โ€” 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 โ€” organized by category.

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Tool Guide
How to Use Postman with Free APIs โ€” 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 โ€” 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 โ€” CoinGecko & More

Build a real-time crypto price tracker using free cryptocurrency APIs that don't require an account.