Free online JSON to query string converter. Transform JSON objects into URL query parameters. Nested objects are JSON-serialized. Runs locally in your browser, no upload.
100% Local
How to Use the JSON to Query String
Paste a JSON object into the input box. Click Convert to Query and the object is transformed into a URL query string with proper percent-encoding. Use Clear to reset both panels.
How the conversion works
Each object key becomes a parameter name
Primitive values (strings, numbers, booleans) are used directly
Nested objects and arrays are serialized as compact JSON strings
All special characters are percent-encoded via URLSearchParams
Features
Uses the native URLSearchParams API for correct encoding
Handles Unicode and special characters correctly
Works with any flat or nested JSON object
All processing runs locally in your browser. Your data is not uploaded to any server.