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JSON Formatter & Tree Viewer
Paste JSON to beautify, minify, and inspect nested structures in tree view.
Ready.
Tree View
How it works
We call JSON.parse() on your input to validate it and build a JavaScript object. Beautify uses JSON.stringify(parsed, null, 2) to re-serialize with 2-space indentation; Minify uses JSON.stringify(parsed) to strip all whitespace. The tree view recursively walks the parsed object and renders collapsible <details> nodes directly in the DOM.
Frequently Asked Questions
Why does my JSON fail to parse even though it looks fine?
Common causes: trailing commas after the last item (valid in JS but not JSON), single-quoted strings instead of double-quoted, or unescaped special characters inside strings. The browser's JSON.parse() is strict.
Does this work on large JSON files?
It works, but the tree view may slow down significantly on files with thousands of nodes because each node is a DOM element. For very large payloads, use Beautify/Minify only and skip the tree view.
Privacy Guaranteed
All data processing, encoding, and formatting are executed locally inside your browser using client-side JavaScript. We never upload your text, inputs, or private data to any server. Your information remains 100% secure.