Query String Parser
About Tool
Modern web applications pass an enormous amount of data directly through the web address. These trailing segments—known as query strings—are often densely packed with tracking codes, session IDs, and filter parameters. A query string parser automatically unpacks these complex URLs, breaking down the chaotic string of ampersands and encoded characters into a clean, highly readable list of individual data points.
For web developers debugging API requests, or digital marketers analyzing campaign tracking links, manually deciphering a URL like ?utm_source=google&utm_medium=cpc&campaign_id=98765 is tedious and prone to human error. This utility translates that machine-readable format instantly into a structured key-value output.
Extracting Data from URLs
To decode your parameters, paste either the full web address or just the isolated query string (the portion beginning with the ? symbol) into the URL or Query String input field. The parser is intelligent enough to automatically locate the start of the query parameters, even if you paste an entire, messy URL.
Click the Parse Query button to execute the extraction. The interface will populate the Parsed Key-Value Pairs area, separating each parameter into a distinct key (the label) and its corresponding value (the data). Complex URL encoding—such as %20 for spaces or %40 for the @ symbol—will be automatically decoded into plain text for readability. Use the Copy JSON action to quickly export this structured data to your clipboard.
Complementary URL Workflows
Query strings are only one part of a web address. If you are auditing complex marketing links or debugging a multi-subdomain routing issue, you might need to understand the host and path before you even look at the parameters. Passing the entire link through a URL Parser first will cleanly isolate the protocol, domain, and path from the query string.
Conversely, once you have parsed a query string and identified the exact parameter you need to change (such as updating a user_id or a tracking tag), you can easily reconstruct the new, perfectly encoded URL by plugging your revised keys and values into the Query String Builder.
Handling Arrays and Nested Parameters
Query strings do not have a universally strict standard for handling arrays (lists of multiple items). Some systems use repeated keys (like ?color=red&color=blue), while others use bracket notation (like ?color[]=red&color[]=blue). This parser will faithfully extract exactly what is in the string, maintaining the literal keys provided so you can accurately diagnose how the target server expects to receive the array.
Frequently Asked Questions
What happens if a parameter has no value?
If a URL contains a key without an equal sign or value (e.g., ?force_refresh&user=123), the parser will still extract the key (force_refresh) and typically display its value as null or an empty string, accurately reflecting the URL structure.
Does it decode base64 strings within the parameters?
The parser handles standard URL encoding (percent-encoding). If a value itself is a base64 encoded string, the parser will extract that raw base64 string, but you will need a separate decoding tool to translate the base64 payload.
Can I parse a hash fragment (the # symbol)?
Standard query parameters exist before the hash fragment in a URL. Data placed after a hash (#) is handled by the browser for client-side routing and is technically separate from standard server-side query strings.
Is the parsed JSON output ready to use in code?
Yes. By clicking Copy JSON, the output is formatted as a valid, stringified JSON object, making it incredibly easy to paste directly into a JavaScript object or Python dictionary for testing.
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