JSON Formatter

Beautify or minify JSON strings instantly and check for validity errors.

Category: Dev Tools

When to use?

Use it when you need to expand minified JSON from an API response or log for better readability, or to verify if your JSON has syntax errors. It is also useful for minifying JSON configuration files before deployment.

How to use

  • Paste your JSON text into the input field.
  • Click the "Format" button to beautify the JSON with indentation.
  • Click the "Minify" button to compress the JSON into a single line without spaces.
  • If there are syntax errors, the error location and details will be displayed.

Input Explanation

Enter valid JSON text. Strings and keys must be enclosed in double quotes ("). Trailing commas are not allowed.

Calculation Basis

The tool parses the text using the browser's built-in `JSON.parse()` to check for syntactic validity. If valid, it formats the output using `JSON.stringify(data, null, 2)` or returns a minified string without whitespace by omitting the indentation arguments.

Usage Examples

  • Improve API Readability - Beautify minified API response JSON to easily analyze its structure.
  • Check JSON Validity - Instantly validate your JSON for syntax or parsing errors.
  • Minify JSON - Remove spaces and line breaks to compress JSON configurations before deployment.

Examples

  • {"name":"John","age":30} → Formatted into a human-readable layout
  • Minified API response JSON → Beautified with a 2-space indentation to inspect its structure

Cautions

  • The generated or formatted result code is for reference; test carefully before applying to production environments.
  • Be aware that compatibility issues may arise if you use custom specifications or framework-specific syntax in the JSON.

Guides

Readable JSON

Formatting adds indentation and line breaks so nested objects and arrays are easier to inspect. Minifying removes unnecessary whitespace for compact transfer.

Validation before use

Invalid JSON, trailing commas, or single-quoted strings can fail parsing. Fix syntax errors before using the formatted result in code.

FAQ

What indentation options are supported?

You can choose between 2-space and 4-space indentation.

What happens if I enter invalid JSON?

An error message indicating the parsing issue and its location will be displayed.

What is JSON minification?

It is the process of compressing JSON into a single line by removing all unnecessary spaces and line breaks.

Can it handle large JSON inputs?

Yes, it processes data within the limits of your browser's memory.

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