Convert URL query parameters into JSON, preserving repeated names as arrays.
Type or paste on the left — the result updates as you type.
All values remain strings. Accepts an optional leading ?. Decodes percent escapes and treats + as a space.
Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.
Tool page updated: 2026-09-27
