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Query String to JSON

Parse a URL or query string into JSON, decoding values and grouping repeated keys into arrays.

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Parse a URL or query string into JSON, decoding values and grouping repeated keys into arrays.

Fine-tune

Optional — sensible defaults are already set.

About Query String to JSON

Paste a full URL or just the part after ? and this tool parses the parameters into a JSON object. Keys and values are URL-decoded with + treated as a space, repeated keys are grouped into arrays, and bracket syntax like user[name]=x can be expanded into nested objects.

When it helps

  • Reading a long UTM-tagged marketing URL or analytics beacon.
  • Inspecting an OAuth authorization request or callback to see every parameter.
  • Debugging how a PHP, Rails or qs-style backend will interpret bracketed form fields.

Tips

  • Anything before the ? and after a # fragment is ignored, so you can paste the whole address.
  • Both & and ; are accepted as separators.
  • Turn off bracket parsing if your keys literally contain [ and ] and should be kept flat.
  • A key without = gets an empty string value, so ?debug becomes {"debug": ""}.

Good to know

Quick answers about query string to json in your browser.

They are collected into an array: {"tag": ["a", "b"]}. The same happens with tag[]=a&tag[]=b when bracket parsing is on.

No. Query strings carry text only, so page=2 becomes "2". Converting types is left to your code, which knows which fields should be numeric.

Yes. There is no sign-up, no watermark and no limit on how many files you process.

No. Files are read and processed locally in your browser, so they never leave your device.

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Part of the JSON, YAML & XML Tools collection.