Query String ↔ JSON

Convert URL query strings to JSON objects and JSON back to query strings.

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How to use Query String ↔ JSON

Three quick steps — no sign-up needed

  1. Step 1

    Choose direction

    Select Query → JSON or JSON → Query.

  2. Step 2

    Paste input

    Enter a query string (with or without leading ?) or a JSON object of parameters.

  3. Step 3

    Copy the converted output

    Use JSON in code or a query string on a URL.

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About Query String ↔ JSON

Query String ↔ JSON converts between URL query parameters and JSON objects. Frontend and backend developers searching "query string to JSON", "JSON to query string", or "URL params parser" need this when bridging APIs and routers.

Pick Query → JSON or JSON → Query, paste input, and copy the result. Repeated keys and array notations can differ between frameworks (PHP-style brackets vs repeated keys) - check the output shape matches your stack.

Encoding of reserved characters matters for round-trips. After converting to a query string, validate the final URL in your application.

A parameter mapping helper - not a full URL router.

Benefits of Query String ↔ JSON

Both directions Query to JSON and back.
API debugging Inspect messy query strings as structured data.
Quick prototyping Build query strings from JSON fixtures.
Clear mode toggle Less chance of converting the wrong way.

Frequently asked questions

Should the query include a leading ?

Either works in most parsers - the important part is the key=value pairs.

How are arrays represented?

Depends on convention; verify against your framework docs.

Does it decode percent-encoding?

Query parsing typically decodes values - confirm special characters after conversion.

Can I convert nested JSON?

Deep nesting may need bracket or JSON-string conventions your server understands.

Is this the same as URL encoding?

Related but different - use a URL encoder for full component encoding tasks.