API Test Lab Documentation & Guides
API Test Lab is a browser-based workflow for REST API testing, no-code load testing, and lightweight traffic monitoring. Start with the guides below no installation required.
Core User Guides
Test an API with a Bearer token
Set authentication and diagnose 401 or 403 responses.
Load test with 100 concurrent users
Configure a controlled workload and interpret results.
How it works
Create your first API test in under two minutes signup, send a request, read the response.
FAQ
Pricing, plans, load testing limits, auth, and common troubleshooting answers.
Blog & tutorials
REST API testing, load testing guides, Postman alternatives, and performance tips.
Features overview
API tester, load tester, traffic monitoring, web analysis, and AI response explain.
Developer & Agent Resources
OpenAPI 3.0 Specification
Machine-readable OpenAPI 3.0 schema covering all platform routes, parameters, and response types.
Agent & LLM Context
llms.txt standard guidance describing when and how AI agents should interact with API Test Lab.
Self-Serve API Keys
Generate immediate X-API-Key tokens in Account Settings for CI/CD pipelines and automated runners.
API Deprecation Policy
Formal policy on URL versioning, 90-day sunset notices, RFC 8594 headers, and 410 Gone transitions.
Backend API Reference & Swagger
Live interactive Swagger UI is available on our API origin, and the raw schema is downloadable anytime via OpenAPI JSON.
Home · Questions? Email hi@apitestlab.org or visit the contact page.