Query string parser
Read URL query parameters and retain repeated keys as arrays.
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How to use it
Paste a full URL or a query string beginning with a question mark.
Good to know
Each key maps to an array so duplicate parameters are retained.
Inspect parameters from a copied link
Paste a full URL or a query string. The input ?tag=tools&tag=text&page=2 becomes:
{
"tag": ["tools", "text"],
"page": ["2"]
}Repeated keys stay repeated
Each key maps to an array, even when it appears once. Plus signs are decoded as spaces, and percent escapes are decoded. Fragments beginning with # are ignored.
The result shows what is in the query string; it does not validate a site’s parameter names or decide whether a value is safe to trust. A malformed percent escape produces an error rather than a partial result.