jsonpost
Formatting & Validation

JSON Formatter / Beautifier

Format and beautify your JSON instantly with customizable indentation and a collapsible tree view.

Runs entirely in your browser — your data never leaves your device.

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How to use this tool

  1. 1Paste or type your JSON into the input editor on the left.
  2. 2Choose your indentation (2 spaces, 4 spaces, or tabs).
  3. 3Copy the formatted output or explore it in the tree view.

Frequently asked questions

What indentation options are available?
You can format with 2 spaces, 4 spaces, or tabs. The output updates instantly as you change the option.
Will it fix invalid JSON?
The formatter reports syntax errors with line and column numbers. To automatically repair common mistakes, use the JSON Fixer tool.
Is my data uploaded to a server?
No. Every tool on JSONPost runs entirely in your browser using JavaScript. Your JSON never leaves your device, so it is safe to use with private or sensitive data.

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Validate JSON against the official specification and catch syntax errors with exact line and column numbers.

JSON Viewer & Tree Explorer

Parse and explore JSON in an interactive tree with expandable nodes, search, and copyable paths.