What are URL query parameters?

Query parameters (or query strings) are a set of key-value pairs attached to the end of a URL, following a question mark (`?`). They are used to pass data from the client to the server. For example, in `?id=123&user=test`, `id` and `user` are the keys.

How does the converter handle duplicate keys?

If the same key appears multiple times in the query string (e.g., `tag=a&tag=b`), our online tool will correctly convert it into a JSON array for that key: `"tag": ["a", "b"]`.

Is this tool safe and secure?

Yes. All parsing and conversion happens in your browser. No data is ever sent to our servers, keeping your URLs and data private. This is a free and secure online utility.

Query Params to JSON | Conversores Online

Query Params to JSON

Convert URL query strings to JSON.

URL or Query String

JSON Output

{
  ...
}

How to Use the Free Online Query String to JSON Converter

Enter a full URL with query parameters or just the query string part (e.g., `id=123&user=test`).
Press the 'Convert to JSON' button.
The tool will instantly parse the string and display it as a well-formatted JSON object in the output box.
Use the copy button to grab the JSON for your use. This tool is completely free and works online.

Frequently Asked Questions