JSON ↔ Query String Converter
Convert a flat JSON object to a URL query string, and back.
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About this tool
Handles flat objects, plus arrays of simple values, which become a repeated key (tag=a&tag=b) and turn back into an array; tag[]=a style is understood too. Nested objects can't be represented in a query string, so the tool tells you rather than writing [object Object]. Numbers with a leading zero (such as 007) and very long ID numbers are kept as text so nothing is lost.