convert

JSON to Query String

Build a URL-encoded query string from a JSON object, with arrays and nested objects supported.

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Build a URL-encoded query string from a JSON object, with arrays and nested objects supported.

Fine-tune

Optional — sensible defaults are already set.

About JSON to Query String

This tool builds a URL-encoded query string from a JSON object. Each value is percent-encoded, nested objects are written with bracket notation like filter[status]=open, and arrays become repeated keys, optionally with a [] suffix.

When it helps

  • Constructing a GET request URL for an API from a JSON set of filters.
  • Generating links with tracking or search parameters for documentation or tests.
  • Encoding a form body for application/x-www-form-urlencoded requests.

Tips

  • Without the [] option, an array becomes tag=a&tag=b, which most frameworks read as a list. Turn on "Use key[] for arrays" for PHP and Rails style tag[]=a&tag[]=b.
  • Brackets in keys are left readable rather than encoded as %5B and %5D, which servers accept either way.
  • Spaces are encoded as %20. Null values become an empty value, as in key=.
  • The output has no leading ?, so add one when appending it to a URL.

Good to know

Quick answers about json to query string in your browser.

No. Repeated keys, key[] and comma-separated values are all in use. Check what your server framework expects; this tool supports the first two.

The HTTP specification sets no limit, but browsers, servers and proxies do. If your encoded data is large, send it in a POST body instead.

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.