Query String Parser

Parse URLs into JSON and build query strings.

Query String Parser extracts parameters from a URL or query string into JSON, and can rebuild a query string from a JSON object. Duplicate keys become arrays. Runs fully in your browser.

Frequently Asked Questions

Does my input leave the browser?

For this tool, processing stays in your browser. Nothing is uploaded to ToolWorld servers.

Can I paste a full URL?

Yes. The tool reads the query portion after ?.

How are duplicate keys handled?

When parsing, duplicate keys become arrays. When building, arrays append multiple values.