Online JSON Editor & Tree Viewer — Beautify, Minify, Validate

Free online JSON editor. Beautify, minify, and validate JSON. Interactive tree view included. No data uploaded.

About JSON Formatter, Beautifier & Validator

4.8out of 5 · 156 ratings

This free online JSON formatter, beautifier, and validator instantly formats minified or messy JSON into clean, readable output with consistent 2-space indentation. The interactive collapsible tree view lets you explore nested objects and arrays at any depth and copy individual values with one click. The built-in validator highlights syntax errors with precise line and column numbers so you can fix problems in seconds. You can also upload a .json file directly — it loads in your browser without being sent anywhere. Minification removes all unnecessary whitespace to reduce payload size for APIs and storage. No signup required and no data is ever uploaded.

Key Features

  • Beautifies JSON with consistent 2-space indentation for human-readable output
  • Minifies JSON by removing whitespace to reduce API payload and storage size
  • Validates JSON and highlights syntax errors with exact line and column numbers
  • Interactive collapsible tree view — expand/collapse nodes and copy individual values
  • Upload a .json file directly from your device without it being sent to any server
  • Keyboard shortcuts: ⌘↵ to format, ⌘M to minify, ⌘⇧V to validate

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From the Blog

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