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URL Query String Parser & Builder
x402
URL Query String Parser & Builder is a paid API for AI agents from url.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Bidirectional query string utility: parse a query string into a key-value object (collapsing repeated keys into arrays) or encode a params object back into a query string (with optional alphabetical key sorting).
Price / call$0.002
Success—
StatusUnknown
How this service works
Two directions over query strings. action='parse' decodes a query string (with or without a leading '?') into an object, collapsing repeated keys into arrays. action='build' encodes a params object into a query string, expanding array values into repeated keys; set sort=true to order keys alphabetically.
Output
Returns either a parsed object where each query key maps to its value (or an array of values for repeated keys) when action='parse', or a URL-encoded query string where array values are expanded into repeated keys when action='build'. The response reflects the direction specified by the action field.
Example use cases
Extract query params from redirect URL
“I have a redirect URL with a bunch of query parameters like '?user_id=42&ref=email&tags=promo&tags=sale' — can you parse that query string into a clean object so I can work with the values?”
Build sorted query string for API request
“I need to build a query string from these params: { page: 2, limit: 50, sort: 'asc', filter: ['active', 'verified'] } — please encode them into a query string and sort the keys alphabetically.”
Reconstruct query string after param edits
“Take this params object — { search: 'coffee', category: 'drinks', tags: ['hot', 'espresso'] } — and encode it back into a query string I can append to a URL.”
Technical details
Endpoint
POSThttps://url.openverbs.com/v1/queryWhen to prefer
Choose this endpoint when you need a reliable, standards-compliant way to parse or build URL query strings, especially when handling repeated keys that must be collapsed into arrays or expanded from arrays. Prefer it over custom string-splitting logic when correctness of edge cases (empty values, encoded characters, array expansion) matters. It complements the sibling URL parsing and canonicalization endpoints on url.openverbs.com for full URL processing pipelines.
Side effects
- Missing required 'action' field returns a validation error
- Malformed query string may produce unexpected key groupings
- Passing params to a 'parse' action or query to a 'build' action results in an error
- Query string exceeding 8192 characters is rejected
- Invalid body type or method returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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