This tool turns a JSON object into a properly URL-encoded query string, ready to append to a link — built in your browser.
How to use it
- Paste a flat JSON object of parameters.
- Keys and values are URL-encoded.
- Copy the query string.
About Query String Builder
Constructing a correct query string means URL-encoding every key and value and joining them properly. This tool takes a flat JSON object and produces an encoded query string you can append to any URL. It is handy for building API requests and tracked links, and it runs entirely in your browser.
FAQ
What input format does it expect?
A flat JSON object where each property becomes one query parameter.
Are special characters encoded?
Yes — keys and values are percent-encoded so the resulting string is URL-safe.
Should I add the question mark?
The tool outputs the parameter string; add a leading ? when appending it to a URL.