JSON ↔ GET Parameters

Converts between a JSON object and a URL query string in either direction. The Encode mode flattens nested objects using dot notation (e.g. { user: { name: "Sam" } } becomes user.name=Sam) via URLSearchParams. The Decode mode parses a query string and rebuilds a nested object by splitting keys on dots.

1. Toggle between To Params (encode) and To JSON (decode) at the top. 2. In encode mode, paste a JSON object; in decode mode, paste a query string. 3. Click the convert button. The output appears in the lower card. 4. Use Copy to copy the result.

Nested objects are joined with dots (a.b=value). Null values become empty strings; arrays are treated as objects, so their numeric indices become dot keys (0, 1, ...) rather than repeated keys. Encoding uses URLSearchParams.toString, so values are percent-encoded. Decoding only splits on dots; it does not infer arrays or parse numbers, so every decoded value is a string.