URL Query String Parser & Builder

Parse URL parameters into structured JSON with array grouping, decoding, and path inspection.

About this tool

Break down long tracking URLs, OAuth callbacks, and API query strings into clean, readable parameter maps.

How to use this tool

  1. Paste a full URL or query string (e.g. ?foo=bar&tag=1&tag=2).
  2. Click Run Query String Parser.
  3. View the structured JSON output with decoded values.

How it works

Uses native URL and URLSearchParams APIs to parse protocol, host, pathname, and individual query keys.

When to use this tool

  • Debugging UTM marketing tracking parameters.
  • Inspecting complex OAuth2 redirect queries and pagination parameters.

Frequently asked questions

Does it support duplicate keys?

Yes. Duplicate keys are automatically grouped into clean JSON arrays.

Limitations

Input must be a valid URL or key=value query string.

Privacy

URLs and parameters are analyzed locally with zero logging.