AkousaQuery String Parser
Parse URL query strings into key-value pairs and build them back.
About Query String Parser
Query String Parser breaks down URL query strings into individual key-value pairs and lets you build query strings from structured data in the opposite direction. It handles percent-encoded values, array parameter notation (param[]=value), nested object notation, and repeated keys with multiple values. Web developers rely on this tool to understand complex API request URLs, extract specific parameters, and construct well-formed query strings without manual encoding. The parser follows the application/x-www-form-urlencoded specification and optionally supports extended syntax used by popular server frameworks.
How to Use
Paste a full URL or just the query string portion beginning after the question mark into the input field and click Parse. Each parameter is displayed as a separate key-value row with its decoded value shown clearly. You can edit parameter names and values in the table and click Build to regenerate the encoded query string with all changes applied. Filter or search across parameters when dealing with long query strings containing dozens of keys.
Common Use Cases
- Debugging complex REST API request URLs with many query parameters to identify misconfigured or missing values
- Extracting UTM campaign tracking parameters (utm_source, utm_medium, utm_campaign) from marketing attribution URLs
- Building well-formed URL query strings from individual parameter values with automatic percent-encoding applied
- Decoding percent-encoded query parameter values in Google Analytics, Facebook Ads, or other analytics platform URLs
- Inspecting OAuth 2.0 authorization callback URLs for authorization codes, state parameters, and error descriptions