Query String Builder
Assemble a correctly encoded query string from key/value pairs.
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About this tool
Assembles a query string from key–value pairs using URLSearchParams, so encoding is handled the way a browser handles it and the result cannot be malformed.
Questions
- Why do spaces become plus signs?
- That is the form-encoding convention for query strings, and every server understands it. In a path a space must be %20 instead.
Privacy
This page does its work in your browser. What you paste is processed by JavaScript running on your own device and is never sent to a DevToolery server — there is no server that could receive it. The page itself is a static file delivered by a CDN. See exactly what is stored.