Query String Converter
Convert between URL query strings and JSON, with nested bracket support.
Query string
Input
JSON
Output
About the Query String Converter
Convert a query string into structured JSON (supporting bracket notation like a[b][]=1) or serialize JSON back into a query string, useful for debugging API requests and form submissions.
Examples
Nested query to JSON
user[name]=Ada&user[roles][]=adminOutput
{"user":{"name":"Ada","roles":["admin"]}}Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser