Online JSON Editor

A JSON editor lets you change a document in place — rename keys, tweak values, add or remove nodes, restructure arrays. JSON Pretty pairs that with syntax highlighting, fold controls, search, and inline validation so the document stays well-formed while you work on it.

Yes — that's the whole point. The editor runs entirely in the browser, no install, no plugins. You can paste, upload a .json file, or land on the editor directly from the Chrome extension's “Open in editor” button.

Yes. Pasted JSON is reformatted automatically. The moment you start typing your own changes, auto-formatting steps out of the way so it doesn’t reflow what you’re editing. One click on Format puts the indentation back when you’re done.

Yes. Parsing and validation run off the main thread, so even large JSON files stay responsive. Fold deep subtrees to keep scrolling fast on really long documents.

Cmd/Ctrl+F opens search across the whole document, Cmd/Ctrl+S re-applies formatting, and the usual editor shortcuts (undo, redo, multi-cursor selection) work as expected. Fold and unfold are one click in the gutter.

All editing happens locally in your browser. JSON Pretty doesn't send your data to a server, doesn't log keystrokes, and doesn't store anything outside your machine.