This tool flattens a JSON object into a URL-encoded query string ready to append to any link — built in your browser.
How to use it
- Paste a flat JSON object.
- Properties become encoded parameters.
- Copy the query string.
About JSON to Query String
When calling an API by URL, you often have parameters as a JSON object that need to become a query string. This tool encodes each key and value and joins them with ampersands, producing a ready-to-use query string. It complements the query string parser and runs entirely in your browser.
FAQ
What JSON shape does it expect?
A flat object; nested objects and arrays should be flattened or serialised first.
Are values encoded?
Yes — both keys and values are percent-encoded so the string is URL-safe.
Is this the same as the query string builder?
It's the same operation, offered under a name developers often search for.