Query tools

URL Parameters to JSON

Paste a full URL or a raw query string and convert URL parameters into a JSON object.
Duplicate parameters are grouped into arrays, making it easy to inspect
how query values are actually passed to applications and APIs.

This tool helps you quickly understand request parameters, debug API calls, and verify generated URLs during development or testing.
Numeric values are automatically parsed when possible, so the resulting JSON is easier to read and reuse.

All parsing and formatting are performed locally in your browser.
No URLs or parameter data are sent to any server, allowing you to safely inspect query strings without exposing sensitive information.

URL or query

JSON Output

Guide

How to use & features

Paste a query string and click “To JSON” to see a formatted object view.
Provide JSON input and click “To URL params” to generate a query string.
Copy the generated output instantly; encoded values are preserved as-is.
Even large parameter sets are processed entirely in the browser with no uploads.

Samples

Sample input & output

Extract query params

Input

https://example.com/search?q=devtoolkits&lang=en

Output

{
  "q": "devtoolkits",
  "lang": "en"
}

FAQ

Frequently asked questions

Is parameter order preserved?

Parsing relies on URLSearchParams, so the original order of query items is kept in the converted JSON.

How are repeated keys handled?

When a key appears multiple times, it becomes an array in the JSON output.

Do you decode percent-encoded values?

Yes. Encoded parameters are decoded automatically before conversion.

Use cases

Common use cases

Round-tripping URLs and JSON
Expand query strings into JSON, edit values, and convert back to build links.
Inspecting nested parameters
Make complex arrays or objects readable and verify they are encoded as intended.
Reviewing shared links
View incoming links as JSON to check for unnecessary parameters or sensitive data.

Notes

Notes & limitations

Work stays in your browser
Inputs and outputs remain local. Closing the tab or clearing cache will remove any temporary state.
Validate critical data
Results are helper outputs—double-check them before sending to production systems or sharing externally.
Large payloads depend on your device
Very large text or files can feel slow in some browsers. Use a desktop environment for heavy workloads.