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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URL Components Parser — Breakdown Protocol, Host, Path & Hash

Parse · Build · Encode · Diff · Batch — 10 powerful URL tools in one, 100% browser-side

Ctrl+Enter = Parse · Ctrl+L = Clear

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Try:

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Paste a URL to parse

Supports HTTP · HTTPS · FTP · Mailto · Custom protocols

📂 10 Features⚡ Instant Parse🔒 100% Browser-side📋 Smart Copy

Ctrl+Enter ParseCtrl+L ClearCtrl+S Download JSONCtrl+Shift+C Copy output1 Overview2 Params3 Validate4 Encode

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URLs pack a lot of information into a single string. This URL components parser extracts and labels every element — scheme, authority, userinfo, host, port, path, query and fragment — according to RFC 3986, the Internet standard that defines URL structure. Understand the anatomy of complex URLs at a glance, compare components across multiple URLs, and copy individual parts with one click.

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 are the official components of a URL according to RFC 3986?

RFC 3986 defines: scheme (https), authority (//user:pass@host:port), path (/api/v2), query (?key=val), fragment (#section). The authority itself contains optional userinfo (user:pass@), host, and optional port. Most URLs only use scheme, host, path and query. The fragment (#) is never sent to the server — it is browser-only.

What is the URL authority component?

The authority is the part after // and before the path. It can contain: userinfo (username:password), host (domain or IP address), and port number. Example: //admin:secret@db.internal:5432 — here admin:secret is userinfo, db.internal is host, and 5432 is port. Credentials in URLs are deprecated for security — use Authorization headers instead.

How does the URL path work with trailing slashes?

Trailing slashes matter in URLs. /api/users and /api/users/ are technically different paths — servers may treat them identically or differently. Web servers like Apache redirect trailing slashes; Nginx by default does not. APIs typically normalise paths. CDNs and caches may treat them as distinct cache keys. Always be explicit about trailing slashes in your routing rules.

What is the fragment identifier (#) and when is it used?

The fragment (hash) is the part after # in a URL. It is NEVER sent to the server — it is handled entirely by the browser or client. Uses: (1) Page anchors — scroll to a heading on page load. (2) Single-page app routing — React Router, Vue Router use # for hash mode. (3) PDF page targeting — document.pdf#page=5. (4) API response references — JSON:API uses fragments for linked resources.