JSON to URL Params
Convert a flat JSON object into a URL query string instantly — build parameter strings for GET requests and APIs. Free, instant, and client-side.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
0 / 100M Limit
Common Use Cases
Building GET request URLs
Convert a parameters object into the query string for testing APIs in a browser or curl.
Creating shareable filtered links
Encode a filter or search state object into URL parameters for a link that reproduces the view.
Frequently Asked Questions
- What JSON shape can be converted to a query string?
- A flat object of key-value pairs: {"page":"2","sort":"name"} becomes page=2&sort=name with proper URL encoding applied to both keys and values. Nested objects and arrays are not supported by the flat conversion.
- How are special characters handled?
- Keys and values are percent-encoded via URLSearchParams, so spaces, ampersands, and Unicode survive the round trip — paste the output straight after a ? in any URL.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.