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URL Parser — Break Down URLs into Components Online

URL Parser dissects any HTTP, HTTPS, FTP, or other URL into its individual components: protocol, hostname, port, pathname, search string, and hash. Query parameters are listed individually as key–value pairs. Useful for debugging redirect chains, understanding API endpoints, and inspecting authentication callback URLs.

URL Parser
output
URL Parser output appears here.

URL Component Breakdown

A URL (Uniform Resource Locator) has up to six distinct components: scheme (https:), authority (//user:password@host:port), path (/some/path), query (?key=value&key2=value2), and fragment (#section). The URL Parser extracts all of these and additionally splits the query string into individual key–value pairs, decoding each percent-encoded value.

The scheme defines the protocol: https for encrypted HTTP, http for plain HTTP, ftp for file transfer, mailto for email, ws/wss for WebSockets. The host is the domain name or IP address. The port is optional — if omitted, the default port for the scheme is used (443 for https, 80 for http). The path identifies the resource on the server. The query string carries parameters. The fragment (#) is processed only by the browser and is never sent to the server.

Debugging OAuth and Redirect URLs

OAuth authorization URLs pack a lot of information into the query string: client_id, redirect_uri, response_type, scope, state, nonce, and sometimes code_challenge. When an OAuth flow fails, the first debugging step is to paste the full authorization URL into the parser and inspect each parameter individually. Is the redirect_uri correct and properly encoded? Is the scope correct? Is the state parameter present?

Redirect chains in analytics and affiliate marketing also benefit from URL parsing. A tracked link may contain a destination parameter that is itself a fully percent-encoded URL. The parser shows the outer URL structure; decoding the destination parameter value with the URL Decoder reveals the inner URL. This is the "URL within a URL" pattern common in tracking pixels and ad click attribution.

Common Use Cases

  • Extracting query parameters from a complex URL
  • Checking the origin and pathname of a redirect URL
  • Understanding OAuth callback URLs with multiple parameters
  • Debugging webhook URLs in API integrations

Frequently Asked Questions

What does a URL parser do?

A URL parser splits a URL into its structural components: protocol (https:), host (example.com), port (443), pathname (/path), search (?foo=bar), and hash (#section). It also decodes individual query parameters.

Privacy & Security

This tool runs entirely in your browser using client-side JavaScript. No data is sent to a server — your input never leaves your machine. SmartDevBox has no account system, no usage tracking, and no paid tier. See the Privacy & Security page for full details.

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