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URL Query Parser
Inspect query parameters instantly
Paste a full URL or query string and see the keys, values, and JSON representation you can copy. Switch to builder mode to compose query strings from scratch.
Parser mode
URL breakdown
Protocolhttps
Hostexample.com
Port(default)
Path/search
Query stringutm_source=drift&utm_medium=email&debug=true
Fragmentresults
Parameters
utm_sourcedrift
utm_mediumemail
debugtrue
JSON preview
{
"utm_source": "drift",
"utm_medium": "email",
"debug": "true"
}What Is a URL Query String?
A query string is the portion of a URL that follows the question mark (?). It consists of key-value pairs separated by ampersands (&) and is the primary mechanism for passing parameters from a browser to a server. Query strings power search filters, pagination, analytics tracking codes, feature flags, and OAuth callback parameters. Understanding and manipulating them is a daily task for front-end developers, back-end engineers, and digital marketers alike.
How to Use This Tool
In parser mode, paste a full URL or a bare query string into the input field. If you enter a complete URL starting with http:// or https://, the tool will break down the protocol, host, port, path, query string, and fragment in a structured display. All query parameters are listed individually and also formatted as a JSON object you can copy with one click. Switch to builder mode to compose a query string from scratch by adding key-value rows and seeing the encoded output in real time.
URL Encoding and Special Characters
Values in query strings must be percent-encoded to remain valid. Spaces become %20 (or +), ampersands inside values become %26, and equals signs become %3D. This tool handles encoding automatically in builder mode, so you can type raw values and the output will be correctly encoded for use in links, API calls, or redirect URIs.
Common Use Cases
- Analytics debugging: Verify that UTM parameters (source, medium, campaign) are present and correctly spelled before sharing a tracking link.
- API development: Inspect query parameters returned in OAuth redirects, webhook callbacks, or paginated API responses.
- QA testing: Build query strings for feature-flag URLs to toggle experiments in staging environments.
- Marketing campaigns: Compose tracking URLs by adding UTM tags in builder mode without manually concatenating strings.
FAQs
What is the difference between query string and URL fragment?
The query string (after ?) is sent to the server and contains key-value parameters. The fragment (after #) is client-side only and is never sent to the server. It is used for in-page navigation and single-page app routing.
How are array parameters represented in URLs?
There is no standard. Common conventions include repeated keys (color=red&color=blue), bracket notation (color[]=red&color[]=blue), and comma-separated values (color=red,blue). This tool displays all key-value pairs as-is.
What is the maximum URL length?
There is no official limit in the HTTP spec, but browsers and servers impose practical limits. Most browsers support 2,048-8,192 characters. For very long data, use POST request bodies instead of query strings.
How should special characters be encoded in query parameters?
Use encodeURIComponent for both keys and values. This encodes characters like &, =, +, and spaces that would otherwise be interpreted as delimiters. The & separates parameters and = separates key from value.
What are the parts of a URL?
A URL has: protocol (https:), host (example.com), port (:8080), path (/api/users), query string (?page=1&sort=name), and fragment (#section). This tool parses and displays all components.
Is Free URL Parser & Query String Analyzer Online free to use?
Free URL Parser & Query String Analyzer Online is completely free and runs in your browser.
Does Free URL Parser & Query String Analyzer Online send my data to a server?
No. Free URL Parser & Query String Analyzer Online processes input directly in your browser.
Do I need to create an account to use Free URL Parser & Query String Analyzer Online?
No account is required to use Free URL Parser & Query String Analyzer Online.
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