What is the difference between hostname and host?

hostname is the domain/IP without port (e.g. api.example.com). host includes the port if non-standard (e.g. api.example.com:8080). For standard ports (80 for HTTP, 443 for HTTPS), port is omitted from host.

Is the URL hash (#fragment) sent to the server?

No — the fragment identifier (#hash) is processed entirely by the browser. It is never sent in the HTTP request to the server. This is why React Router and Angular Router use it for client-side navigation without server requests.

What is URL encoding and when is it needed?

URL encoding (percent encoding) converts special characters into %XX hex format. Spaces become %20 or +, & becomes %26, = becomes %3D. Query parameter values must be encoded to prevent ambiguity. Use encodeURIComponent() for values, encodeURI() for full URLs.

What is the maximum URL length?

There is no official RFC limit, but practical limits exist: Chrome/Firefox support up to ~2MB, IE/Edge limit at 2048 characters, Apache server default limit is 8192 bytes. For long data, use POST body instead of URL query params.

How do I extract query params from a URL in JavaScript?

Use the URL API: const url = new URL(window.location.href); url.searchParams.get("key") — returns value or null. url.searchParams.forEach((value, key) => ...) — iterate all params. Works in all modern browsers and Node.js 10+.

What is the difference between encodeURI and encodeURIComponent?

encodeURI() encodes a full URL — preserves :, /, ?, =, & characters needed for URL structure. encodeURIComponent() encodes a URL component (single value) — encodes everything including :, /, ?, &. Always use encodeURIComponent() for query parameter values.

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Every URL is made of distinct parts — protocol, host, port, path, query string and fragment. This URL parser instantly decodes any URL and displays every component in a clear, color-coded breakdown. Whether you are debugging API endpoints, building redirect rules, or analysing query parameters, this tool saves you from guessing where one part ends and another begins. Paste and parse instantly — all processing happens in your browser, zero data sent to servers.

What is a URL Parser?

A URL (Uniform Resource Locator) parser breaks a web address into its individual components: protocol (scheme), username, password, hostname, port, pathname, query string (search params), and hash fragment. This tool uses the browser's native URL API for 100% accurate parsing — the same engine your browser uses — with zero server requests.

10 Features in This URL Parser

1. Live URL Breakdown — Colour-coded anatomy view showing every URL part. 2. Query Params Editor — Edit, add, delete params with live URL reconstruction. 3. URL Builder — Compose a URL from protocol, host, path, params, and hash. 4. Encode/Decode — encodeURIComponent and encodeURI with quick-load. 5. cURL Generator — One-click cURL command for any HTTP method. 6. URL Diff — Compare two URLs part-by-part, highlight differences. 7. Batch Parser — Parse up to 50 URLs at once, export as CSV. 8. URL Validator — Detect HTTPS issues, credentials, length warnings. 9. Smart Copy — Copy any individual URL part with one click. 10. History — Last 50 parsed URLs with one-click restore.

Frequently Asked Questions

What is a URL parser and what does it do?

A URL parser breaks a Uniform Resource Locator into its named parts: scheme/protocol (https), host (example.com), port (8080), pathname (/v2/users), search/query string (?page=1), and fragment/hash (#section). This is the same operation browsers perform internally using the WHATWG URL Standard — this tool makes it visual and interactive.

Why would a developer need to parse URLs?

Common use cases: (1) Debugging broken API calls — which query parameter is malformed? (2) Writing redirect rules — what is the exact path pattern? (3) Parsing URL parameters in JavaScript without regex. (4) Extracting UTM tracking parameters from marketing URLs. (5) Validating URL structure before storing in a database. (6) Understanding OAuth callback URLs with multiple encoded parameters.

What is the difference between the URL host and origin?

Host = hostname + port (e.g., api.example.com:8080). Hostname = just the domain (api.example.com). Origin = scheme + host (https://api.example.com:8080) — this is the security boundary browsers use for CORS. Port is omitted from origin and host if it is the default for the scheme (443 for https, 80 for http).

Can I use this parser for relative URLs?

Relative URLs like /api/users?id=1 or ../images/logo.png do not have a host — they are resolved relative to a base URL. The parser requires an absolute URL with a scheme. To parse relative URLs, prepend a base: https://example.com/api/users?id=1. In JavaScript, use new URL(relativeUrl, baseUrl) for the same behaviour.