Complete Guide to HTTP API Testing: From Basics to Advanced Debugging Techniques

Master the core skills of HTTP API testing, including GET/POST/PUT/DELETE requests, header configuration, request body formats, authentication methods, and debugging techniques. Boost your development efficiency with an online API testing tool.

Online JWT Generator/Decoder: JSON Web Token Tool

Learn JWT (JSON Web Token) structure, how it works, and use cases. Understand how to use an online tool to generate and decode JWTs, plus security best practices.

Online Certificate Decoder: Parse SSL/TLS Certificate Information

Learn how to use an online tool to decode and view SSL/TLS certificate details. Understand certificate structure, common fields, and how to verify certificate validity.

HTTP GET vs POST: When to Use Each? Semantics, Safety, and Best Practices

GET vs POST semantics, idempotency, caching, URL length limits, security tradeoffs, REST conventions, and common mistakes. Includes curl examples and a decision table for picking the right method.

What Is a CORS Preflight Request (OPTIONS)? A Cross-Origin Mechanism Every Frontend Developer Must Know

What is a CORS preflight request? Why does the browser send an OPTIONS request? This article explains preflight trigger conditions, response headers like Access-Control-Allow-Origin, common CORS error troubleshooting, and how to bypass CORS restrictions in API testing.