What is a URL query string?

A query string is the part of a URL after the `?` character, consisting of key=value pairs separated by `&`. For example, in `https://example.com/search?q=hello&page=2`, the query string is `q=hello&page=2`.

How are repeated parameters handled?

When the same key appears multiple times (e.g., `?tag=json&tag=tools`), the values are collected into an array in the JSON output: `{"tag":["json","tools"]}`.

Can I parse a full URL, not just the query string?

Yes. You can paste a full URL and the tool will extract and parse the query string portion automatically, ignoring the scheme, host, and path.

Does the tool handle URL encoding?

Yes. Percent-encoded characters in parameter values (e.g., `%20` for space, `%2F` for slash) are automatically decoded in the JSON output. When serializing back to a query string, values are properly percent-encoded.

URL ↔ JSON

Parse URL query strings to JSON and serialize JSON back to query strings

Input

Output

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About URL ↔ JSON

This tool parses URL query strings into JSON objects and serializes JSON back into URL query strings. It is useful when debugging API calls, building query string parameters programmatically, or converting URL parameters into a data structure you can manipulate in code.

✓Parses any URL or query string into a JSON object keyed by parameter name
✓Handles repeated parameters as arrays (e.g., `?tag=a&tag=b` → `{"tag":["a","b"]}`)
✓Serializes a JSON object back to a URL-encoded query string
✓Decodes percent-encoded characters automatically

URL ↔ JSON

About URL ↔ JSON

Frequently Asked Questions