Query String to JSON Converter
ConvertersParse URL query strings to JSON objects instantly in your browser. Uses URLSearchParams. Swap to JSON→QueryString in one click. 100% client-side and free.
Query String → JSON
Query Stringplaintext
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JSONjson
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Input: 50 chars
About Query String to JSON Converter
The QueryString to JSON converter uses the browser's native `URLSearchParams` API to parse a URL query string (with or without a leading `?`) and produces a JSON object. Repeated parameters become JSON arrays. Both editors are live — swap to JSON→QueryString with one click. The JSON output has an interactive tree view.
Features
- ✓Bidirectional — edit either panel and the other updates in real time
- ✓Powered by native URLSearchParams API
- ✓Accepts query strings with or without leading ?
- ✓Repeated parameter keys become JSON arrays
- ✓URL-percent-encoded values are decoded automatically
- ✓JSON output has interactive tree view and graph visualization
- ✓Swap direction to JSON→QueryString with a single click
- ✓Download converted JSON as a .json file
- ✓Copy output to clipboard in one click
- ✓100% client-side — data never leaves your browser
Common Use Cases
- Inspecting and debugging URL query parameters from API requests
- Parsing OAuth or SSO callback query strings to JSON
- Extracting query parameters from logged URLs for analysis
- Converting web form-encoded data to JSON for API testing
- Decoding URL-encoded parameters in redirects or webhook URLs
Frequently Asked Questions
QDoes it include the ? or # characters?
The converter accepts both full URLs and bare query strings. It strips any leading ? and ignores fragment (#) sections automatically.
QWhat happens with repeated parameters like ?a=1&a=2?
Repeated keys are collected into a JSON array: { "a": ["1", "2"] }.
QIs my data sent to a server?
No. All conversion runs in your browser.