Build requests, inspect headers, test webhooks, and validate OpenAPI specs.
Send browser-based API requests and inspect responses quickly.
A lightweight API playground for testing HTTP methods, headers, JSON bodies, response status, timing, and raw response text. Requests are sent directly from your browser.
Build copy-ready cURL commands from method, headers, and body.
Generate cURL commands for REST APIs, webhook examples, authenticated requests, JSON payloads, and debugging documentation snippets.
Generate fetch request snippets from URL, method, headers, and body.
Build HTTP request snippets for frontend debugging, API documentation, support tickets, and reproducible bug reports.
Generate and verify webhook HMAC signatures locally.
Test webhook payload signatures, generate sample cURL requests, and debug HMAC SHA-256, SHA-1, or MD5 signature headers without uploading payloads.
Parse HTTP headers and check common security header coverage.
Inspect raw HTTP response headers, normalize header names, and quickly spot missing CSP, HSTS, X-Frame-Options, Referrer-Policy, and related security headers.
Format Swagger or OpenAPI YAML and JSON locally.
Clean up Swagger and OpenAPI documents for documentation, pull requests, generated specs, and copied API definitions.
Validate essential OpenAPI and Swagger document structure.
Check OpenAPI version, info, paths, operations, and common document structure before sharing API specs.
View OpenAPI endpoints and schemas as a readable summary.
Paste an OpenAPI spec and get a quick endpoint list, method summary, API title, version, and schema names without uploading the spec.