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JSON Formatter & Validator – Beautify JSON Online

Beautify and validate JSON with live errors and 2-space, 4-space, or tab indentation. Runs in your browser and lets you download formatted JSON.

JSON Formatter

Beautify and validate JSON instantly

Ready · 2-space indent

Formatted JSON will appear here

Paste JSON above to begin

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What is JSON Formatter?

Beautify JSON with real-time validation and line-number error detection. Choose 2-space, 4-space, or tab indentation, and see key, object, array, and depth counts for your data. Key order is preserved as written. Use it for API responses, configuration files, or JSON before committing. All processing happens in your browser.

  • json
  • formatter
  • validator
  • beautifier

Features

What you get with JSON Formatter.

  • Real-Time Validation

    Clear parse errors, with a line number when the browser reports one.

  • Adjustable Indentation

    Choose 2 spaces, 4 spaces, or tabs.

  • Structure Stats

    See key, object, array, and nesting-depth counts.

How to use JSON Formatter

Follow these steps to get the best results.

  1. Paste your JSON

    Paste or type JSON into the input — errors are flagged instantly with a line number.

  2. Choose indentation

    Pick 2-space, 4-space, or tab indentation to match your project.

  3. Copy the formatted output

    The beautified JSON updates live as you type, along with key and depth stats.

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Frequently asked questions

Common questions about JSON Formatter.

The tool shows the parse error message, with a line number when your browser reports one. Common fixes: add missing quotes around keys, remove trailing commas, and escape special characters.

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