URL Parser

Parse a URL into scheme, host, port, path, query parameters, fragment, and origin — fully client-side

Input

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Output

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What is URL Parser

Written by Giorgos Kostas. Last reviewed: April 18, 2026

URL Parser uses the WHATWG `URL` parser — the same engine used by browsers — to split any URL into its scheme, userinfo, host, port, pathname, query parameters, fragment, and origin.

It's ideal when you need to verify the structure of a URL, extract query parameters, or debug callback URLs from OAuth flows.

Why use it

Debug OAuth and SSO callback URLs.
Extract query parameters for logs and tests.
Verify canonical URL shapes before shipping.
Teach URL anatomy to new developers.
Decode complex parameter lists safely.

Features

WHATWG-compliant parser
Extracts scheme, host, port, path
Lists all query parameters
Shows origin & fragment
Local-only URL Parser processing keeps data in-browser

How to use URL Parser

Paste URL. Include the scheme (http / https).
Run. Review each URL component.
Copy parts. Use in tests, docs, or debugging sessions.

Example (before/after)

URL

https://user:[email protected]:8443/v2/items?q=books&page=2#top

Parsed

Scheme:    https
Username:  user
Password:  (set, hidden)
Host:      api.example.com
Port:      8443
Pathname:  /v2/items
Query:     ?q=books&page=2
Params:
  q = books
  page = 2
Fragment:  #top
Origin:    https://api.example.com:8443

Common errors

Missing scheme

URLs without http(s):// fail to parse.

Fix: Prepend the scheme before parsing.

Unencoded characters

Raw spaces or quotes cause errors.

Fix: URL-encode special characters first.

FAQ

Does it follow redirects?

No — this is a pure syntactic parser.

Is input uploaded?

No — parsing is fully client-side.

Does it decode query values?

Yes — `URLSearchParams` handles percent-decoding automatically.

Can it handle mailto: or custom schemes?

Yes — any WHATWG-parsable URL works.

Does it reveal passwords?

No — the password is detected but redacted in the report.

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