JSON Formatter

Format, validate & minify JSON

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Output0 lines • 0 chars
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About JSON Formatter & Validator

1What is it?

The JSON Formatter is your go-to tool for working with JSON data. Whether you're debugging an API response, cleaning up messy configuration files, or preparing JSON for production use, this tool has you covered. It automatically detects syntax errors, provides clear error messages with line numbers, and offers multiple output formats including formatted (pretty print), minified, and sorted keys.

2Use Cases

  • Format API responses for easier debugging and analysis
  • Validate JSON configuration files before deployment
  • Minify JSON to reduce file size for production
  • Sort JSON keys alphabetically for consistent ordering
  • Find and fix syntax errors in JSON data
  • Convert between compact and readable JSON formats
  • Compare JSON structures by formatting consistently

3Examples

Format compact JSON

Input

{"name":"John","age":30,"city":"NYC"}

Output

{
  "name": "John",
  "age": 30,
  "city": "NYC"
}

Minify JSON

Input

{
  "name": "John"
}

Output

{"name":"John"}

?Frequently Asked Questions

Is my JSON data sent to any server?

No, absolutely not. All JSON processing happens entirely in your browser using JavaScript. Your data never leaves your device, making it completely safe to format sensitive configuration files, API responses with tokens, or any private data.

What's the maximum JSON file size I can format?

There's no hard limit set by the tool. The practical limit depends on your browser's memory. Most modern browsers can handle JSON files up to 50-100MB comfortably. For very large files, you might experience some slowdown, but the tool will still work.

Why does my JSON show an error?

Common JSON errors include: missing commas between items, trailing commas (not allowed in strict JSON), single quotes instead of double quotes, unquoted property names, and missing closing brackets. The error message shows the approximate location of the issue.

What's the difference between formatting and validating?

Formatting changes how the JSON looks (adding indentation, line breaks) without changing the actual data. Validation checks if the JSON is syntactically correct. This tool does both automatically - if formatting works, your JSON is valid!

Can I format JSON with comments?

Standard JSON doesn't support comments. If your JSON-like data has comments (like in some config files), you'll need to remove them first. Consider using JSON5 or YAML for configuration files that need comments.