URL Query String to JSON Converter
Convert URL query strings to JSON online — decodes percent-encoding and +, repeated keys become arrays, numbers and booleans typed. 100% in-browser.
Input · text0 chars
Output · json0 chars
🔒 100% private: this tool runs entirely in your browser. Your data is never uploaded, stored or logged anywhere.
How to url params → json
- Paste a full URL or just the query part (?a=1&b=2).
- Keys become JSON fields — repeated keys become arrays.
- Copy or download the JSON.
FAQ
Does it handle the full URL?
Yes — paste the whole URL and only the query part is parsed.
How are + and %20 handled?
Both decode to spaces, per URL conventions.
Can I keep everything as strings?
Turn off "Auto-detect" — useful when values like version numbers must stay textual.