API Testing Tips & Guides

Practical, no-fluff articles on API testing, QA and software development

Hands-on guides written for developers and QA engineers who test, debug and integrate REST APIs every day. Tool-agnostic advice — with examples you can reproduce in RestRuno or any other API client.

Testing

REST API Testing Best Practices

A practical checklist: what to assert, which edge cases matter, and how to keep API tests maintainable.

 Security

API Security Testing Checklist

12 checks inspired by the OWASP API Security Top 10 — auth, authorization, injection, rate limits and data exposure.

 Auth

API Authentication Explained

Bearer tokens, API keys, Basic, OAuth 2.0 client credentials, signed JWTs and AWS Signature v4 — when to use each.

 QA

Data-Driven API Testing

Run the same requests against CSV or JSON datasets to cover boundary values, invalid input and bulk scenarios.

 Workflow

Version-Control Your API Collections

Keep API collections in Git: readable diffs, code review for requests, and secrets kept out of the repo.

 Debugging

HTTP Status Codes for API Debugging

What 400 vs 401 vs 403 vs 422 really mean, and a fast triage flow for failing API integrations.

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