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JSON Formatter

Clean, validate, beautify and minify your JSON instantly with browser-side privacy.

No data storedUp to 2 MBFree to use

Input JSON

Paste or type your JSON document

63 bytes

Formatted Output

Syntax-highlighted, ready to export

63 bytes
{
    "name": "SmartToolsNest",
    "framework": "Laravel 12"
}

JSON formatted successfully.

JSON is Valid

Technical Specs

Designed for modern developer workflows

Maximum Size
2 MB per document
Privacy
No database persistence
Processing
Live validation with browser export
Standard
RFC 8259 compatible JSON

What is JSON Formatter?

JSON Formatter turns compact or poorly indented JSON into a readable tree while checking that the syntax can be parsed. It is useful to developers, API testers, students, and support teams who need to inspect structured data without installing an editor.

How to use JSON Formatter

  1. 1.Paste an API response, configuration object, or JSON array into the input.
  2. 2.Choose formatting for readable indentation or minifying for compact transport.
  3. 3.Run the formatter and use the reported line and column to correct any syntax error.
  4. 4.Copy or download the validated result for your application or documentation.

Key features

  • ✓Syntax-aware validation identifies missing commas, quotes, and brackets.
  • ✓Configurable indentation makes nested objects and arrays easier to review.
  • ✓Minification removes unnecessary whitespace without changing data values.
  • ✓Browser-side processing keeps pasted payloads on the current device.

Common use cases

  • Debug an API response before mapping it into application models.
  • Clean a configuration file before code review or commit.
  • Validate a webhook payload copied from logs.
  • Minify fixture data for a test or documentation example.

Frequently asked questions

Is it safe to format sensitive JSON?

Processing takes place in your browser, but you should still remove passwords, tokens, personal records, and production secrets before pasting diagnostic data.

Why is my JSON invalid?

Common causes include trailing commas, single quotes, unescaped line breaks, comments, or a missing closing bracket. The error position helps locate the first parse failure.

Can the formatter handle JSON arrays?

Yes. A valid top-level value may be an object, an array, a string, a number, a boolean, or null.

Does formatting change the JSON data?

No. Formatting changes whitespace only; minifying also preserves keys and values. Always compare the result if key order matters to a separate system.

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