Query String Parser
Parse and inspect URL query parameters as structured key-value pairs. Decodes URL-encoded values and displays them in a readable JSON format. Code never leaves your device — formatting and validation run locally in your browser.
How to Use the Query String Parser
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Frequently Asked Questions
How are arrays parsed?
?a=1&a=2 becomes a proper list here — never last-wins overwrites, order preserved.
Percent-decoding?
%20, %2F, and UTF-8 sequences decode automatically on parse.
Nested brackets?
PHP-style foo[bar] structures nest correctly into real nested objects.
Is my input uploaded anywhere when using Query String Parser?
No — parsing runs locally in your browser, free with no signup.
What does the default example produce?
The default ?name=Alice&age=30&active=true&tags=admin,user yields 4 keys pretty-printed with JSON.stringify(params, null, 2). Parsing strips one leading ?, splits on & and the first =, decodeURIs both sides (missing values become ''), repeated keys overwrite so the last wins, and output saves as query-params.json.
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Last updated October 2026