Launching today
JSON Lens
Private, in-browser JSON formatter, validator & visualizer
2 followers
Private, in-browser JSON formatter, validator & visualizer
2 followers
JSON Lens is a fast, privacy-first JSON tool that runs entirely in your browser — your data never leaves your device. Paste or drag in any JSON and instantly: • Format, minify, or validate • View as an interactive tree, raw text, or an auto-flattened table • Locate errors down to the exact line & column • Handle large files without freezing (lazy rendering + smart row limiting) No sign-up, no install, no upload. It even works offline.
Free
Launch Team / Built With
Viktor.comAn AI coworker that actually does the work
Promoted
Hi Product Hunt! I built JSON Lens because I was tired of pasting production JSON into random online formatters and wondering where my data went.
JSON Lens is 100% client-side — parsing, formatting, and validation all happen in your browser, so your JSON never touches a server. It also pinpoints syntax errors to the exact line and column, which is the feature I use most when debugging API responses.
It's free, needs no account, and works offline. I'd love feedback on what to improve next!