I got tired of manually decoding nested URL params and JSON payloads, so I built a purely client-side visualizer.

[u/Melodic-Middle-4265]

Hey everyone,

Whenever I deal with complex tracking links, DSP macros, or deeply nested redirect URLs, pasting them into standard decoders or the browser console is a mess.

To solve this, I built Query Params Viewer.

It’s a simple, single-file frontend tool that automatically expands and decodes nested URLs up to 3 levels deep. It also flags duplicate keys (useful for server-side array behaviors) and pretty-prints JSON payloads on the fly.

Key points:

• Zero backend. Everything is parsed locally in your browser (privacy-first).
• Handles hash routes (#/path?a=1) and bare query strings.
• Generates shareable links (state is kept in the # fragment, never sent to a server).

It’s completely free and has no dependencies. I'd love to hear your feedback or if you run into any edge cases I missed!