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JSON Tree Viewer

Inspect nested JSON structures and fix syntax errors

SIMILAR DEVELOPER

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Base64 Encoder/Decoder

Fast conversion between string and base64 encodings

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JWT Encoder/Decoder

Decode a JWT to read its header, payload and expiry status. Decoding only: signatures are not verified.

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UUID Generator

Generate UUID v4 and v7 in bulk, with formatting options and a built-in validator.

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WHAT IS JSON TREE VIEWER?

The JSON Formatter instantly validates, beautifies, and minifies JSON with syntax highlighting — an essential tool for developers and API testing.

Features

  1. Real-time validation: Instantly shows if the JSON is valid; errors display the exact location and reason.
  2. Beautify: Formats minified or unreadable JSON into a readable indented structure — supports 2 or 4 space indentation.
  3. Minify: Removes all unnecessary whitespace and newlines to produce the smallest possible JSON — ideal for APIs and config files.
  4. Syntax highlighting: Output is color-coded — keys (blue), strings (green), numbers (orange), booleans (yellow), null (red).
  5. One-click copy: Click "Copy Output" to copy the formatted result to your clipboard instantly.
  6. Download as .json: Save the formatted output directly as a .json file.

How to use?

  1. Paste your JSON into the left input area.
  2. Choose "Beautify" or "Minify" mode; beautify mode lets you pick 2 or 4 space indentation.
  3. The right panel shows the formatted result in real-time with syntax highlighting.
  4. Click "Copy Output" or "Download" to save your result.

Frequently asked questions

What can the JSON formatter do?

Beautify, minify, validate syntax, tree-view browsing, collapse/expand nodes.

How do I find JSON syntax errors?

Paste your JSON and the tool validates it instantly, highlighting error location and reason.

Does it support large JSON files?

Yes, though very large files (MBs) may slow the browser slightly.

Formatted JSON will appear here…