JSON → URL query string

Client

Build shareable query strings from a single-level JSON object—ideal for API query params or quick link builders. Nested objects need flattening elsewhere first.

Learn more: JSON to query strings

Encode a flat object as URL-encoded key=value pairs—nested structures are not expanded; use flatten or custom logic first.

Pairing

Use the complementary “query string → JSON” tool to round-trip simple payloads. For arrays or nested data, prefer JSON in a single body parameter or a dedicated API format.

JSON object → query string

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Only one level of keys with string, number, boolean, or null values—nested objects are not supported.

Common use cases

  • Build shareable query strings from flat key/value maps for GET requests and deep links.
  • Serialize simple filter objects into application/x-www-form-urlencoded text for HTML forms and APIs.
  • Pair with the decode tool to verify round-trip encoding while debugging integrations.

Common mistakes to avoid

  • Encoding nested objects without flattening first

    This path expects a single-level JSON object. Use flatten or custom naming before encoding nested structures.

  • Forgetting that arrays need a convention

    Flat encoders differ on repeated keys versus bracket notation. Confirm what your server expects before relying on output.

FAQ

Is encoding performed locally?

Yes. Keys and values never leave your browser tab.

How does this relate to JSON in POST bodies?

Query strings are for URLs and form encoding. JSON POST bodies use different Content-Type headers—choose the tool that matches your API.

More tools

Related utilities you can open in another tab—mostly client-side.