What does a JSON formatter do?

A JSON formatter takes raw or minified JSON and adds proper indentation and line breaks to make it human-readable. It can also validate the JSON structure, highlight syntax errors, and minify formatted JSON for production use.

How do I validate JSON?

Paste your JSON into the input field and click Format. If the JSON is invalid, the tool will show the exact error message and location so you can fix it. Common errors include missing commas, trailing commas, unquoted keys, and single quotes instead of double quotes.

Is my JSON data safe?

Yes. All formatting and validation happens in your browser. No data is sent to any server. This makes it safe for API keys, configuration files, and other sensitive JSON data.

JSON Formatter & Validator

Format, beautify, validate, or minify JSON. Auto-fix common syntax errors. 100% client-side · nothing leaves your browser.

Input

0 chars

Paste raw, minified, or malformed JSON. The tool will format and validate it.

Output

Formatted or minified output with validation status.

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Frequently Asked Questions

A JSON formatter takes raw or minified JSON and adds proper indentation and line breaks to make it human-readable. It also validates the structure and reports any syntax errors with their location in the document.

The tool detects missing or extra commas, mismatched brackets or braces, unquoted property names, single quotes instead of double quotes, trailing commas (not valid in strict JSON), and unterminated strings. The "Fix & format" mode can automatically correct many of these.

Format (beautify) adds indentation and newlines to make JSON readable. Minify removes all unnecessary whitespace to produce the smallest possible output, ideal for APIs and configuration files where file size matters.

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Input

Output

Frequently Asked Questions

What does a JSON formatter do?

What common JSON errors does this tool detect?

What is the difference between format and minify?