Query String Parser converts a URL query string into a JSON object, making the parameters easy to read and inspect. Paste any URL with query parameters — like a Google Analytics tracking link, an API endpoint URL, or an OAuth redirect — and get a clean JSON object showing each key-value pair with all percent-encoding decoded.
Query strings use ? to start, & to separate parameters, and = to assign values to keys. Characters that are not URL-safe are percent-encoded (spaces become %20, ampersands become %26). The parser splits the string at each & to get individual key=value pairs, then applies decodeURIComponent() to both the key and value to restore the original characters.
Either works. You can paste the full URL including the https:// scheme and domain, or just the query string starting with ?. The parser automatically finds the first ? and starts reading from there.
Both the keys and values are run through decodeURIComponent() before appearing in the JSON output. So %20 becomes a space, %26 becomes &, %3D becomes =, and so on. The JSON output shows the decoded, human-readable values.
If a key appears more than once (for example ?color=red&color=blue), the values are grouped into an array in the JSON output: {"color": ["red", "blue"]}. This matches how most web frameworks handle repeated query parameters.
No. Parsing runs entirely in your browser. Your URLs and query parameters never leave your device.
Yes. Use the Query String Builder tool to convert a JSON object back into a URL query string.
Yes, completely free with no account required.
Tool workspace
Free Query String Parser online — instantly parse massive URL query parameters into a clean, readable JSON object. Automatically URL-decodes all keys and values. No login.
Output
Input
https://example.com/shop?category=shoes&sort=price_asc&q=red%20sneakers
Output
{ "category": "shoes", "sort": "price_asc", "q": "red sneakers" }