Category
HTTP & Web
URLs, query strings, HTTP headers, cookies, CORS, CSP, and web development helpers.
Content-Type Builder
Assemble a valid HTTP Content-Type header value from a media type and parameters, with RFC 9110 token and quoting checks.
Cookie Header Parser
Split a pasted HTTP Cookie request header into ordered name/value pairs locally in your browser.
CORS Header Analyzer
Inspect supplied CORS response headers and optional preflight request details without contacting a server.
CSP Analyzer
Parse a Content-Security-Policy field value and show directive syntax, duplicate behavior, and common fallback relationships locally.
CSP Builder
Compose a Content-Security-Policy field value from common directives and source expressions in your browser.
CSS Minifier
Strip comments and collapse insignificant whitespace from a bounded CSS snippet without parsing or rewriting it.
HTML Formatter
Re-indent a bounded HTML snippet with two-space nesting, preserving <pre>, <textarea>, <script>, and <style> content verbatim.
HTTP Header Formatter
Normalize an HTTP header block locally while preserving duplicate fields and order.
HTTP Security Header Analyzer
Inspect pasted HTTP response headers for selected security-header syntax and context notes, entirely in your browser.
HTTP Status Reference
Search common registered HTTP response status codes and their standard meanings.
Query String Parser
Decode query parameters while preserving duplicate keys and their original order.
Set-Cookie Attribute Analyzer
Parse pasted Set-Cookie lines and explain their attribute syntax and relationships locally.
URL Parser
Parse an absolute URL into its standard components locally in your browser.
URL Pattern Tester
Test a path or URL against a WHATWG URLPattern using the browser's own URLPattern API, and inspect the captured groups.
User-Agent Parser
Identify broad browser, engine, platform, and mobile tokens from a User-Agent string.