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API & Web Tools

DevTools API & Web tools include URL encode/decode, User-Agent parsing, DNS lookup, API request testing, WebSocket debugging, CORS check, and security headers — some features use server-side proxy.

URL Encode/Decode

Encode or decode URLs and query parameters so special characters transmit safely.

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User-Agent Parser

Parse User-Agent strings to identify browser, operating system, and device information.

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DNS Lookup

Look up A, AAAA, CNAME, MX, TXT, NS, SOA, and other DNS records for a domain.

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API Request Tester

Send HTTP requests from the browser to test REST APIs and inspect response status and body.

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WebSocket Tester

Connect to WebSocket endpoints, send and receive messages, and inspect real-time traffic.

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CORS Checker

Check whether a URL returns correct CORS response headers and diagnose cross-origin access issues.

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Security Headers Checker

Paste HTTP response headers to find missing or misconfigured security-related headers.

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About this tool

API debugging and web troubleshooting need multiple network utilities. This toolset helps check DNS, CORS, security headers, and WebSocket connections quickly.

How to use

  1. Select a Web/API tool.
  2. Enter a URL, domain, or request parameters.
  3. Review the query or detection result.

FAQ

How do DNS and CORS checks use the server?

DNS lookup and CORS check use a DevTools server proxy to avoid browser CORS limits. Query content is not stored.

Which WebSocket addresses can the debugger connect to?

ws:// or wss:// endpoints for quick WebSocket service verification.

Which HTTP methods does the API request tool support?

GET, POST, PUT, PATCH, DELETE, and other common methods with custom headers and body.

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