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TinyToolbox - Free Online Tools

JSON Formatter & Beautifier

Format and beautify JSON online. Paste your JSON, click Format, and get pretty-printed output instantly.

  • Instant
  • 100% Private
  • Free Forever
  • No Signup
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About This JSON Formatter & Beautifier

Use this free JSON Formatter online to beautify, pretty-print, and validate JSON instantly. Paste minified API responses, config files, or logs and turn them into readable, indented JSON in one click.

Unlike desktop editors, this JSON beautifier runs fully in your browser. Nothing is uploaded, so you can safely format private payloads, tokens, and production configs.

What You Can Do

  • Beautify / pretty-print minified JSON with 2 or 4 space indentation
  • Validate JSON syntax and surface clear error messages
  • Minify JSON to shrink payload size for production
  • Copy formatted output in one click
  • Works offline after the page loads — no account required
  • Privacy-first: all processing stays on your device

How to Use JSON Formatter & Beautifier

  1. 1

    Paste JSON

    Paste your raw or minified JSON into the input box.

  2. 2

    Choose indent

    Select 2-space or 4-space indentation.

  3. 3

    Format

    Click Format JSON to beautify and validate instantly.

  4. 4

    Copy result

    Copy the pretty-printed output or minify it for production.

Popular Use Cases

  • Debugging API responses and webhook payloads
  • Cleaning messy JSON before committing config files
  • Teaching or documenting JSON examples
  • Quick validation before sending data to a service

Example

Input:  {"name":"Alice","age":30,"city":"New York"}

Output: {
  "name": "Alice",
  "age": 30,
  "city": "New York"
}

Frequently Asked Questions

What is JSON formatting?

JSON formatting (or beautifying) is the process of taking a minified or raw JSON string and adding line breaks and indentation to make it human-readable.

Is it safe to use this JSON formatter?

Yes, our JSON Formatter is 100% secure. All processing is done locally in your browser. We do not store or transmit any data you paste into the tool.

How do I fix 'Invalid JSON' errors?

Check for common mistakes like missing quotes around keys, trailing commas, or mismatched brackets. Our tool will provide an error message to help you locate the syntax issue.

Can I minify JSON here too?

Yes, you can use the 'Minify' button to remove all unnecessary whitespace from your JSON, which is useful for reducing payload sizes in production.

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