CONVERTER

Query String ⇄ JSON

Turn key=value pairs into structured JSON, or serialize a flat JSON object into a query string for APIs and logs.

Import

Accepts: .txt, .json

Input may be a full URL (use the part after ?)

Duplicate keys become JSON arrays. Runs only in your browser.

Query string or URL

JSON output

Output will appear here…

When this helps

Debugging webhook payloads and redirect URLs without dropping data into a random site
Turning log lines or curl snippets into JSON you can diff or store
Building query strings from config objects for integration tests

Browsers use URLSearchParams semantics: repeated keys become a JSON array of strings in the output object.

URL Encoder & Decoder

Percent-encode or decode URL fragments and values.

JSON Formatter

Pretty-print or minify JSON after you parse it.

JWT Decoder

Inspect JWT claims when debugging auth flows.

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