32 tools shown
Describe an API and get a working OpenAPI 3.1 spec back.
Design and run AI and MCP tools locally, then test tool calls with AI.
Paste a spec, get a plain-English explanation.
Design, lint, visualize, and preview OpenAPI specs.
Validate a spec, score its design, and autofix what it can.
Paste a curl command and get it in your language of choice.
Paste JSON and get TypeScript, Python, or Go types.
Paste a spec, mock every endpoint at once.
Pick a resource, get a live mock endpoint.
Turn JSON or CSV into a live REST API with working writes.
Paste JSON or text, get an editable endpoint.
Test REST, SOAP, SSE, and other HTTP-based APIs.
Create and run GraphQL queries and mutations.
Connect to a WebSocket server and send or receive messages.
Publish and subscribe to Socket.IO events.
Invoke unary and streaming methods on a gRPC server.
Connect to remote MCP servers and inspect their capabilities.
Check status, response time, and payload size for any public API endpoint.
See if any API, site, or service is down.
Schedule a real monitor for any URL and watch runs land live.
Schedule a real monitor for chained requests and watch runs land live.
Get server response time and an estimated TTFB for any website.
See when a domain's TLS certificate expires.
See what every response header does to caching, CORS and security.
Hit any endpoint with virtual users and see latency, throughput and errors.
Estimate throughput from users and think time.
Generate mock CSV or JSON test rows for API testing.
Paste a function and get unit tests in your framework of choice.
Paste a payload, learn what every field means.
Send a signed mock webhook event to your endpoint.
Get a URL that catches webhooks and inspect each one.
Take hardcoded API keys and tokens out of anything you paste.
Every tool works without an account, and there is nothing to install. Some tools run locally; others use Postman services for hosted mocks, requests, monitoring, and AI. When you're ready for the full workflow — Spec Hub, Monitors, performance testing, and the Collection Runner — create a free Postman account and pick up right where you left off.