I'm a software engineer with over 13 years of professional experience. I built format-json.net out of frustration — every JSON tool available online is cluttered with ads, leaving you with barely any workspace. Most aren't open source, and none give you a clear answer on whether your sensitive data is being stored on a remote server. format-json.net is different. It's 100% client-side — your data never leaves your browser. It's open source, ad-free, and purpose-built for developers who need a clean, distraction-free workspace. Beyond the basics of formatting and validation, it offers features you won't find elsewhere: Object Filtering — Working with a massive, deeply nested JSON structure? Filter down to just the properties you care about, instantly. Table View — Visualize large arrays as a sortable table, making it far easier to scan and analyze datasets at scale. No sign-ups, no tracking, no compromise. Just a fast, private, and powerful JSON toolkit built by a developer, for developers.

Format JSON

Paste ugly, copy pretty

Paste ugly, copy pretty