JSON to Query String Converter
ConvertersConvert a flat JSON object to a URL query string instantly in your browser. Uses URLSearchParams. Handles arrays. Swap to QueryString→JSON in one click. Client-side.
JSON → Query String
JSONjson
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Query Stringplaintext
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Input: 92 chars
About JSON to Query String Converter
The JSON to QueryString converter takes a flat JSON object (or an object with shallow arrays) and generates a URL query string using the native `URLSearchParams` API. Array values are serialised as repeated parameters (`key=a&key=b`). Both editors are live — swap to QueryString→JSON with one click.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Powered by native URLSearchParams API
- ✓Array values serialised as repeated parameters
- ✓Values are automatically URL-percent-encoded
- ✓Validates that input is a flat JSON object
- ✓Swap direction to QueryString→JSON with a single click
- ✓Download output as a .txt file
- ✓Copy output to clipboard in one click
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Building URL query strings for API requests from JSON payloads
- Constructing GET request parameters from JSON filter objects
- Generating URL-encoded form data from JSON for testing
- Creating shareable links with structured query parameters from JSON
Frequently Asked Questions
QDoes it handle nested JSON?
No — URLSearchParams supports flat key-value pairs and arrays. Nested objects are not valid query string values; flatten your JSON first.
QIs my data sent to a server?
No. All conversion runs in your browser.