Query string to JSON

Read a URL's parameters as JSON, or build a query string from an object, with repeated keys handled as the arrays they are.

Direction
txt
JSONjson
The result appears here

Questions

What happens to a key that appears twice?+

It becomes an array. tag=jazz&tag=harp is two values for one key, and an object with one of them silently dropped is how half the pagination bugs on the web start.

Can I paste a whole URL?+

Yes. Everything before the ? is ignored, so you can paste the address straight out of the bar.

Is the encoding handled?+

Yes, by URLSearchParams itself, which is the browser's own implementation: %20 and + both come back as spaces, and going the other way the values are escaped properly.

Related tools

URL encoder and decoderPercent-encode a value or decode one back, choosing between a single query value and a whole URL, with the parts listed out when the input is a URL.JSON formatter and validatorFormat, validate, sort or minify JSON. Unquoted keys, trailing commas and comments are accepted, so a pasted console log works as well as a strict file.CSS to JS objectConvert CSS rules or a bare declaration list into JavaScript style objects, camelCased and quoted, ready for a style prop or a CSS-in-JS file.

The tools are free. So is most of the library.

1935 blocks and 989 pieces for shadcn/ui and Tailwind, built on the same tokens these tools write. Install one with a command and the code is yours.

Browse the blocks

No signup for the tools. MIT for free blocks, commercial licence for Pro.

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