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{ } JSON Formatter & Validator

Paste raw or minified JSON to format it with proper indentation, validate it for syntax errors, and copy the prettified output. Runs 100% in your browser.

Input JSON

Type or paste JSON above to validate

Indent: Sort keys

Formatted Output

About this tool

All processing happens locally in your browser using the native JavaScript JSON.parse() and JSON.stringify() APIs. No data is transmitted to any server.

Useful for: debugging API responses, cleaning up minified configs, and validating hand-written JSON before submitting it.

How to use this tool

1 Paste your raw JSON string into the input area.

2 Click Format to indent and syntax-highlight it.

3 Use the Minify button to collapse it back to a single line for production use.

4 Fix any syntax errors shown by the validator before using the JSON.

Frequently asked questions

What are common JSON syntax errors?

Trailing commas, single-quoted strings instead of double-quoted, missing quotes around keys, and unescaped special characters inside strings.

What is the difference between JSON and JavaScript objects?

JSON is a strict data format derived from JavaScript. All keys must be double-quoted strings, and values can only be strings, numbers, booleans, null, arrays, or objects. JavaScript objects are more flexible.

How do I minify JSON for production?

Use the Minify button to remove all whitespace. Minified JSON is smaller and faster to transmit over a network.

Can I validate JSON with this tool?

Yes. The tool parses the JSON and highlights any syntax errors, showing the line and character position of each problem.