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Query String to JSON Converter

Convert URL query strings to JSON and build query strings from JSON objects.

To convert a query string to JSON, paste a URL or the query portion and each parameter becomes a key. Repeated keys and bracket notation collapse into arrays, and percent-encoded values are decoded, so the JSON reflects what the server actually receives.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How are repeated parameters handled?

Inconsistently, across the web. ?tag=a&tag=b is an array in PHP and Rails, but only the last value in some frameworks. If you control both ends, an explicit array syntax removes the ambiguity.

How to use the query string to json converter

  1. 1Enter or paste your query string or json.
  2. 2Choose the direction.
  3. 3The result appears immediately — copy or download it.

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