API testing guides — test REST and GraphQL APIs, write contract tests, and automate API validation.
Testing
A well-tested SaaS API is one of the strongest competitive advantages a product can have. Developers who integrate your API need to trust that authentication works predictably, rate limits are enforced fairly, and older API versions continue to behave as documented. When any of these break, the cost is
Testing
APIs are the backbone of modern applications. They are also the primary attack surface. While web application security testing has decades of tooling and methodology behind it, API security testing is often treated as an afterthought — a Postman collection with some happy path tests and nothing more. This guide changes
Testing
Every development team has some informal way of documenting API calls. Slack messages with curl commands. Postman collections that live on one person's laptop. A wiki page with example requests that went stale three sprints ago. None of these are good solutions. The VS Code REST Client extension
Testing
API testing has a tooling problem. Postman collections balloon into unmaintainable JSON blobs. Custom shell scripts with curl become brittle and unreadable. Language-specific frameworks require onboarding everyone to the same tech stack. Hurl cuts through all of that with a refreshingly simple idea: describe HTTP requests and assertions in
Testing
Microservices break apart functionality and introduce integration failure as a first-class risk. When Team A changes an API endpoint, Team B's service breaks — in production, during an incident, after everyone has gone home. Contract testing exists to catch these failures before they reach production, by codifying the
Testing
There are two kinds of API testing tools: the ones that look impressive in demos and the ones that actually fit into your daily workflow. httpyac is firmly in the second category. It extends the familiar .http file format with scripting, environments, authentication helpers, and a capable CLI — then wraps
Testing
Writing HTTP API tests is the easy part. The test files exist, the assertions look right, and they pass on your laptop. Then CI comes into play and everything falls apart: secrets are not available, the test environment is not ready, tests run in the wrong order, results do not
API Testing
Tyk is an open-source API gateway that manages authentication, rate limiting, analytics, and API versioning through a declarative API definition system. Unlike gateways that use UI-driven configuration, Tyk stores its entire configuration as JSON documents — which means you can version-control it and write automated tests against it.
API Testing
Okta is the identity layer for many enterprise applications. Testing Okta integrations is challenging because identity flows involve browser redirects, SAML assertions, multi-step authentication, and external callback URLs. But untested auth is the most dangerous untested code — a broken login means no users can access your application. This guide
API Testing
AWS Cognito provides user authentication, authorization, and identity management for AWS-hosted applications. Testing Cognito integrations is critical — a misconfigured user pool can lock users out, a broken Lambda trigger can block all signups, and a wrong JWT audience claim can silently reject valid users. This guide covers testing Cognito
API Testing
An API gateway is one of the most critical components in a modern backend architecture. It handles authentication, rate limiting, routing, request transformation, and more — all before a request reaches your application code. When the gateway misbehaves, everything downstream breaks. Testing it thoroughly is non-negotiable. This guide covers the
OWASP ZAP
OWASP ZAP is the most widely used open-source web application security scanner. This guide covers integrating ZAP's Docker-based full scan and API scanning into GitHub Actions CI/CD pipelines, configuring authentication for authenticated scans, and handling alert triage to keep pipelines actionable. Key Takeaways Run ZAP